阅读说明：本技术 一种抑制碳钢在卤化物盐水中腐蚀的缓蚀剂组合物 (Corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water ) 是由 李强 于 2021-09-27 设计创作，主要内容包括：本发明公开了一种抑制碳钢在卤化物盐水中腐蚀的缓蚀剂组合物。这种缓蚀剂组合物具有高效、环保、固态的特点。该缓蚀剂组合物按照质量百分含量包括基料和辅料。所述基料由氯化物、溴化物中的一种或它们的混合物组成。所述辅料由苯并杂环类物质、酮肟类物质、葡萄糖酸及其盐类物质、抗坏血酸及其盐类物质、柠檬酸及其盐类物质、氨基酸及其盐类物质、碱或碱性氧化物中的至少两种或者两种以上的混合物组成。向卤化物盐水中,添加卤化物盐水质量百分含量为0.5％～15％的缓蚀剂组合物可以明显抑制卤化物盐水对碳钢的腐蚀。将所述的缓蚀剂组合物,直接配制成质量百分数为20％～80％的水溶液也可以明显抑制碳钢的腐蚀。(The invention discloses a corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water. The corrosion inhibitor composition has the characteristics of high efficiency, environmental protection and solid state. The corrosion inhibitor composition comprises a base material and auxiliary materials according to the mass percentage. The base material consists of one of chloride and bromide or a mixture of the chloride and the bromide. The auxiliary materials comprise at least two or more than two mixtures of benzo-heterocycle substances, ketoxime substances, gluconic acid and salt substances thereof, ascorbic acid and salt substances thereof, citric acid and salt substances thereof, amino acid and salt substances thereof, and alkali or alkaline oxides. The corrosion inhibitor composition with the halide brine content of 0.5-15 percent by mass can obviously inhibit the corrosion of the halide brine to the carbon steel. The corrosion inhibitor composition can be directly prepared into an aqueous solution with the mass percent of 20-80 percent, and can also obviously inhibit the corrosion of carbon steel.)

1. The corrosion inhibitor composition for inhibiting the corrosion of carbon steel in halide salt water is characterized by comprising 30-80 wt% of base material and 20-70 wt% of auxiliary material. The base material is a mixture composed of one or more of chloride and bromide according to any proportion. The auxiliary material is composed of two or more than two substances, and is a mixture at least comprising 0.1-20 wt% of the auxiliary material and one or more than two of alkali or alkaline oxide according to any proportion, and 0.1-5 wt% of the auxiliary material, 0.1-30 wt% of ketoxime substance, 0.1-40 wt% of gluconic acid and salt substance thereof, 0.1-30 wt% of ascorbic acid and salt substance thereof, 0.1-10 wt% of citric acid and salt substance thereof, and 0.1-10 wt% of amino acid and salt substance thereof according to any proportion.

2. The corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water as claimed in claim 1 wherein said corrosion inhibitor composition is a solid.

3. A corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water as claimed in claim 1, wherein the chloride in the base stock is a mixture of one or more of calcium chloride, magnesium chloride, sodium chloride, lithium chloride, potassium chloride and their crystalline hydrates in any proportion; calcium chloride is preferred. The bromide in the base material is one or a mixture of more of calcium bromide, magnesium bromide, sodium bromide, lithium bromide, potassium bromide and crystal hydrates thereof according to any proportion, and is preferably lithium bromide.

4. The corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water according to claim 1, wherein the benzo-heterocycle substance in the auxiliary material is one or a mixture of more than two of benzotriazole, methylbenzotriazole, mercaptobenzotriazole, carboxyl benzotriazole, benzothiophene, methylbenzothiophene and mercaptobenzothiophene according to any proportion; benzotriazole is preferred.

5. A corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water as claimed in claim 1, wherein the ketoxime substance in the auxiliary material is a mixture of one or more of dimethyl ketoxime, methyl ethyl ketoxime, methyl isobutyl ketoxime, acetophenone ketoxime and dimethylglyoxime in any proportion; dimethyl ketoxime is preferred.

6. The corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water as claimed in claim 1, wherein gluconic acid and salt substances thereof in the auxiliary material are one or a mixture of more of gluconic acid, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of gluconic acid, and crystalline hydrate of gluconic acid; preferably calcium gluconate. The ascorbic acid and salt substances thereof in the auxiliary materials are ascorbic acid, isoascorbic acid, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of ascorbic acid or isoascorbic acid, and a mixture of one or more of crystal hydrates thereof according to any proportion; calcium ascorbate is preferred. The citric acid and salt substances thereof in the auxiliary materials are citric acid, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of the citric acid, and one or more of crystal hydrates of the citric acid and the calcium salt, the magnesium salt, the sodium salt, the lithium salt and the potassium salt of the citric acid; preferably calcium citrate. The amino acid and salt substances thereof in the auxiliary materials are one or a mixture of more of glycine, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of glycine and crystal hydrate of glycine in any proportion; preferably calcium glycinate.

7. The corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide brine according to claim 1, wherein the alkali or alkaline oxide in the auxiliary material is a mixture of one or more of sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, magnesium hydroxide, calcium oxide and magnesium oxide in any proportion; calcium oxide is preferred.

8. Use of a corrosion inhibitor composition for inhibiting corrosion of carbon steel in a halide salt water according to claim 1, wherein the corrosion inhibitor composition is added to the halide salt water for inhibiting corrosion of the carbon steel by the halide salt water; the corrosion inhibitor composition accounts for 0.5-15 wt% of the halide salt water. The halide brine is a mixture formed by one or more of calcium chloride aqueous solution, magnesium chloride aqueous solution, sodium chloride aqueous solution, lithium chloride aqueous solution, potassium chloride aqueous solution, calcium bromide aqueous solution, magnesium bromide aqueous solution, sodium bromide aqueous solution, lithium bromide aqueous solution and potassium bromide aqueous solution according to any proportion.

9. Use of a corrosion inhibitor composition according to claim 1 for inhibiting corrosion of carbon steel in a halide salt water, wherein the corrosion inhibitor composition is formulated as an aqueous solution having a concentration of 20 to 80 wt% and is used directly as the halide salt water for inhibiting corrosion of carbon steel.

Technical Field

The invention belongs to the field of chemistry, and particularly relates to a corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water.

Background

The brine generally has a low eutectic point, for example, a 30% by weight solution of calcium chloride in water has a eutectic point of about-50 ℃. Often used as a cold transfer medium in industrial enterprises, commonly known as chilled brine. The frozen brine has been used in industrial processes for nearly a hundred years in large quantities because of its low price, nonflammable properties, low eutectic point (freezing point), and the like.

However, the calcium chloride aqueous solution has high corrosivity to steel, for example, the uniform corrosion rate to Q235B carbon steel is generally 0.10mm/a, and a general carbon steel pipeline is corroded and leaked after being used for 2-3 years; the stainless steel has pitting corrosion to stainless steel materials, and the common stainless steel with the type number of 304, 316L and the like generates large-area perforation when used in calcium chloride aqueous solution for 1 to 2 years.

In the past, when calcium chloride and sodium chloride aqueous solutions were used as frozen brine, dichromate was used as a corrosion inhibitor. Adding a certain amount of potassium dichromate or sodium dichromate into each ton of calcium chloride and sodium chloride aqueous solution, and adjusting the pH value of the solution to be about 8 to obtain the brine corrosion inhibition rate of about 90 percent to the carbon steel.

In the chinese patent of invention "corrosion inhibitor for inhibiting brine corrosion of carbon steel and method for preparing and using the same" granted publication No. CN103508570B, general problems with the use of dichromate type corrosion inhibitors have been pointed out: 1) potassium dichromate belongs to a cationic oxidation type corrosion inhibitor, and if the adding amount is insufficient, the coverage rate of a passivation film is insufficient, a higher polarization potential is formed between a non-covered part, and corrosion is accelerated. When an enterprise uses a calcium chloride solution, the amount of calcium chloride required to be supplemented is about 50% -100% of the amount of calcium chloride required to be preserved every year, so that the potassium dichromate is easily lowered to the critical concentration due to insufficient supplementation, and the corrosion is accelerated; 2) the potassium dichromate belongs to heavy metal salts strictly limited in national standards, is extremely harmful to the environment, and chromium elements discharged or lost into the environment can enter a food chain along with intermediate environments of plants, animals and the like and are finally absorbed by human beings. Potassium dichromate has strong carcinogenicity to humans. The national standard GB 8978-1996 determines that chromium and hexavalent chromium are pollutants of a first class, the total chromium of the highest emission concentration is not more than 1.5mg/L, and the hexavalent chromium is not more than 0.5 mg/L; the discharge standard GB21904-2008 for chemical synthesis pharmaceutical industry water pollutants stipulates that the content of hexavalent chromium in sewage discharge of the existing enterprises is less than 0.5mg/L, and the discharge of newly-built enterprises is less than 0.3 mg/L;

in the Chinese patent of invention No. CN103508570B, "corrosion inhibitor for inhibiting corrosion of brine of carbon steel and preparation and use method thereof", there are also mentioned formula of sodium nitrite, sodium hexametaphosphate, zinc dihydrogen phosphate, sodium hydroxide, etc. besides formula of potassium dichromate corrosion inhibitor, the corrosion inhibitor has low corrosion inhibition rate, generally about 80%, and is not suitable for long-term industrial use.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a corrosion inhibitor composition for inhibiting the corrosion of carbon steel in halide salt water.

The purpose of the invention is realized by the following technical scheme: a corrosion inhibitor composition for inhibiting corrosion of carbon steel in halide salt water comprises 30-80 wt% of base material and 20-70 wt% of auxiliary material. The base material is a mixture composed of one or more of chloride and bromide according to any proportion. The auxiliary material is composed of two or more than two substances, and is a mixture at least comprising 0.1-20 wt% of the auxiliary material and one or more than two of alkali or alkaline oxide according to any proportion, and 0.1-5 wt% of the auxiliary material, 0.1-30 wt% of ketoxime substance, 0.1-40 wt% of gluconic acid and salt substance thereof, 0.1-30 wt% of ascorbic acid and salt substance thereof, 0.1-10 wt% of citric acid and salt substance thereof, and 0.1-10 wt% of amino acid and salt substance thereof according to any proportion.

Further, the corrosion inhibitor composition is a solid.

Further, the chloride in the base material is a mixture composed of one or more of calcium chloride, magnesium chloride, sodium chloride, lithium chloride, potassium chloride and crystal hydrates thereof according to any proportion; calcium chloride is preferred. The bromide in the base material is one or a mixture of more of calcium bromide, magnesium bromide, sodium bromide, lithium bromide, potassium bromide and crystal hydrates thereof according to any proportion, and is preferably lithium bromide.

Furthermore, the benzo-heterocycle substances in the auxiliary materials are one or a mixture of more than two of benzotriazole, methylbenzotriazole, mercaptobenzotriazole, carboxyl benzotriazole, benzothiophene, methylbenzothiophene and mercaptobenzothiophene according to any proportion; benzotriazole is preferred.

Furthermore, the ketoxime substance in the auxiliary material is a mixture of one or more of dimethyl ketoxime, methyl ethyl ketoxime, methyl isobutyl ketoxime, acetophenone ketoxime and dimethylglyoxime in any proportion; dimethyl ketoxime is preferred.

Further, the gluconic acid and salt substances thereof in the auxiliary materials are gluconic acid, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of the gluconic acid, and a mixture of one or more of crystal hydrates of the gluconic acid and the calcium salt, the magnesium salt, the sodium salt, the lithium salt and the potassium salt of the gluconic acid in any proportion; preferably calcium gluconate. The ascorbic acid and salt substances thereof in the auxiliary materials are ascorbic acid, isoascorbic acid, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of ascorbic acid or isoascorbic acid, and a mixture of one or more of crystal hydrates thereof according to any proportion; calcium ascorbate is preferred. The citric acid and salt substances thereof in the auxiliary materials are citric acid, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of the citric acid, and one or more of crystal hydrates of the citric acid and the calcium salt, the magnesium salt, the sodium salt, the lithium salt and the potassium salt of the citric acid; preferably calcium citrate. The amino acid and salt substances thereof in the auxiliary materials are one or a mixture of more of glycine, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of glycine and crystal hydrate of glycine in any proportion; preferably calcium glycinate.

Further, the alkali or alkaline oxide in the auxiliary materials is a mixture composed of one or more of sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, magnesium hydroxide, calcium oxide and magnesium oxide according to any proportion; calcium oxide is preferred.

The application of the corrosion inhibitor composition for inhibiting the corrosion of the carbon steel in the halide salt water is characterized in that the corrosion inhibitor composition is added into the halide salt water and is used for inhibiting the corrosion of the halide salt water to the carbon steel; the corrosion inhibitor composition accounts for 0.5-15 wt% of the halide salt water. The halide brine is a mixture formed by one or more of calcium chloride aqueous solution, magnesium chloride aqueous solution, sodium chloride aqueous solution, lithium chloride aqueous solution, potassium chloride aqueous solution, calcium bromide aqueous solution, magnesium bromide aqueous solution, sodium bromide aqueous solution, lithium bromide aqueous solution and potassium bromide aqueous solution according to any proportion.

The corrosion inhibitor composition is prepared into an aqueous solution with the concentration of 20-80 wt%, and the aqueous solution is directly used as halide brine for inhibiting the corrosion of the carbon steel.

The invention has the beneficial effects that: the invention relates to a novel high-efficiency, environment-friendly and solid corrosion inhibitor composition which is used for replacing a dichromate formula with strong carcinogenicity, a nitrite formula with high toxicity, a non-environment-friendly formula with high phosphorus and zinc contents and a liquid formula which is inconvenient to store and easy to freeze. The invention solves the problem of corrosion of carbon steel materials when brine (especially calcium chloride solution, sodium chloride solution, magnesium chloride solution and lithium bromide solution) is used.

Detailed Description

The invention relates to a corrosion inhibitor composition for inhibiting carbon steel from corroding in halide brine (particularly calcium chloride brine, magnesium chloride brine, sodium chloride brine, lithium chloride brine, potassium chloride brine, calcium bromide brine, magnesium bromide brine, sodium bromide brine, lithium bromide brine and potassium bromide brine), which specifically comprises the following components in percentage by weight: the corrosion inhibitor composition consists of a base material and auxiliary materials. In the corrosion inhibitor composition, 30-80% by mass is taken as a base material, and 20-70% by mass is taken as an auxiliary material. Adding the uniformly mixed corrosion inhibitor composition into brine to be used as a carbon steel corrosion inhibitor; preferably, the base material accounts for 60-75% of the mass of the corrosion inhibitor composition, and the auxiliary material accounts for 25-40% of the mass of the corrosion inhibitor composition.

The base material is one of chloride and bromide or a mixture thereof. The chloride is one or a mixture of more of calcium chloride, magnesium chloride, sodium chloride, lithium chloride, potassium chloride and crystal hydrates thereof according to any proportion; preferably, the chloride is calcium chloride or a crystalline hydrate of calcium chloride. The bromide is one or a mixture of more of calcium bromide, magnesium bromide, sodium bromide, lithium bromide, potassium bromide and crystal hydrates thereof according to any proportion; preferably, the bromide is lithium bromide or a crystalline hydrate of lithium bromide.

The auxiliary material is composed of two or more than two substances, which at least comprises one of alkali or alkaline oxide or a mixture of the alkali or the alkaline oxide and one or more of benzo-heterocycle substances, ketoxime substances, gluconic acid and salt substances thereof, ascorbic acid and salt substances thereof, citric acid and salt substances thereof and amino acid and salt substances thereof through uniform mixing.

One of the auxiliary materials is benzo heterocyclic substances accounting for 0.1 to 5.0 percent of the total weight of the auxiliary materials. The benzo-heterocycle substance is one or a mixture of more than two of benzotriazole, methyl benzotriazole, mercapto benzotriazole, carboxyl benzotriazole, benzothiophene, methyl benzothiophene and mercapto benzothiophene according to any proportion; preferably, the auxiliary material comprises benzotriazole accounting for 0.5-2.0% of the total mass of the composition.

One of the auxiliary materials is ketoxime substance accounting for 0.1-30.0 percent of the total weight of the auxiliary materials. The ketoxime substance is one or a mixture of more than two of dimethyl ketoxime, methyl ethyl ketoxime, methyl isobutyl ketoxime, acetophenone ketoxime and dimethylglyoxime in any proportion; preferably, the auxiliary material comprises dimethyl ketoxime accounting for 2.0-10.0% of the total mass of the auxiliary material.

One of the auxiliary materials is gluconic acid and salt substances thereof which account for 0.1 to 40.0 percent of the total weight of the auxiliary materials. The gluconic acid and gluconate substances are gluconic acid, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of the gluconic acid, and one or a mixture of more than two of crystal hydrates of the gluconic acid and the calcium salt, the magnesium salt, the sodium salt, the lithium salt and the potassium salt of the gluconic acid; preferably, the auxiliary material comprises calcium gluconate accounting for 5.0-30.0% of the total mass of the auxiliary material.

One of the auxiliary materials is ascorbic acid and salt substances thereof which account for 0.1 to 30.0 percent of the total weight of the auxiliary materials. The ascorbic acid and salt substances thereof are ascorbic acid, isoascorbic acid, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of ascorbic acid or isoascorbic acid, and one or a mixture of more than two of crystal hydrates thereof according to any proportion; preferably, the auxiliary material comprises calcium ascorbate accounting for 5.0-25.0% of the total mass of the auxiliary material.

One of the auxiliary materials is citric acid and salt substances thereof accounting for 0.1 to 10.0 percent of the total weight of the auxiliary materials. The citric acid and salt substances thereof are citric acid, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of the citric acid, and one or a mixture of more than two of crystal hydrates of the citric acid and the calcium salt, the magnesium salt, the sodium salt, the lithium salt and the potassium salt of the citric acid; preferably, the auxiliary material comprises calcium citrate which accounts for 0.5-5.0% of the total mass of the auxiliary material.

One of the auxiliary materials is amino acid and salt substances thereof accounting for 0.1 to 10.0 percent of the total weight of the auxiliary materials. The amino acid and salt substances thereof are glycine, calcium salt, magnesium salt, sodium salt, lithium salt and potassium salt of glycine, and one or a mixture of more than two of crystal hydrates thereof according to any proportion; preferably, the adjuvant comprises 0.5% -8.0% of calcium glycinate.

One of the auxiliary materials is alkali or alkaline oxide accounting for 0.1 to 20.0 percent of the total weight of the auxiliary materials. The alkali or alkaline oxide is one or a mixture of more than two of sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, magnesium hydroxide, calcium oxide and magnesium oxide according to any proportion; preferably, the auxiliary material comprises calcium oxide accounting for 3.0-10.0% of the total mass of the auxiliary material.

The use method of the invention comprises the following steps: adding 0.5-15.0% of the corrosion inhibitor composition into calcium chloride aqueous solution, magnesium chloride aqueous solution, sodium chloride aqueous solution, lithium chloride aqueous solution, potassium chloride aqueous solution, calcium bromide aqueous solution, magnesium bromide aqueous solution, sodium bromide aqueous solution, lithium bromide aqueous solution or potassium bromide aqueous solution according to the mass percentage for use as a corrosion inhibitor; preferably, 1.0 wt% to 10.0 wt% of the above corrosion inhibitor composition is added to the halide brine.

The other using method of the invention is as follows: the corrosion inhibitor composition is directly used as a solute of brine and dissolved in water to prepare brine with corrosion inhibition performance on carbon steel; preferably, the concentration of the corrosion inhibitor composition in the prepared aqueous solution is 40.0-60.0%.

According to the general principle of metal and alloy corrosion experiments GB/T19291-plus 2006, the performance of the corrosion inhibitor is evaluated, and the experiment result shows that when the experiment temperature is normal temperature (25 ℃), the experiment time is 168 hours, and 0.5-15 wt% of the corrosion inhibitor composition is added, the corrosion inhibition rate is higher than 90.0%, and is consistent with the corrosion inhibition rate of a bichromate formula.

The present invention will be further described with reference to the following examples.

Comparative example 1: preparing a calcium chloride solution with the mass concentration of 30%, and performing a corrosion experiment on Q235B carbon steel at normal temperature (25 ℃) according to general principles of corrosion experiments on metals and alloys GB/T19291-2006, wherein the corrosion rate is 0.0813 mm/a.

Comparative example 2: preparing a lithium bromide solution with the mass concentration of 55%, and performing a corrosion experiment on Q235B carbon steel at normal temperature (25 ℃) according to general principles of corrosion experiments on metals and alloys GB/T19291-2006, wherein the corrosion rate is measured to be 0.1425 mm/a.

Example 3: the corrosion inhibitor composition comprises the following components in percentage by mass: 75.0 percent of calcium chloride is taken as a base material, 1.0 percent of benzotriazole (accounting for 4.0 percent of the auxiliary material), 5.0 percent of calcium gluconate (accounting for 20.0 percent of the auxiliary material), 6.0 percent of dimethylketoxime (accounting for 24.0 percent of the auxiliary material), 7.0 percent of calcium ascorbate (accounting for 28.0 percent of the auxiliary material), 1.0 percent of calcium citrate (accounting for 4.0 percent of the auxiliary material), 1.0 percent of calcium glycinate (accounting for 4.0 percent of the auxiliary material) and 4.0 percent of calcium oxide (accounting for 16.0 percent of the auxiliary material) are mixed to form the auxiliary material. 0.5 wt% of the corrosion inhibitor composition of example 3 was added to the calcium chloride solution of comparative example 1, and the corrosion rate was 0.0079mm/a and the corrosion inhibition rate was 90.3% according to the general principles of corrosion experiments on metals and alloys GB/T19291-one 2006.

Example 4: 15.0 wt% of the corrosion inhibitor composition of example 3 was added to the calcium chloride solution of comparative example 1, and the corrosion rate was 0.0052mm/a and the corrosion inhibition rate was 93.6%, as determined according to general principles of corrosion experiments on metals and alloys GB/T19291-one 2006.

Example 5: the corrosion inhibitor composition comprises the following components in percentage by mass: 60.0 percent of calcium chloride is taken as a base material, 1.5 percent of benzotriazole (accounting for 3.8 percent of the auxiliary material), 11.5 percent of calcium gluconate (accounting for 28.8 percent of the auxiliary material), 7.0 percent of dimethylketoxime (accounting for 17.5 percent of the auxiliary material), 10.0 percent of calcium ascorbate (accounting for 25.0 percent of the auxiliary material), 1.5 percent of citric acid (accounting for 3.8 percent of the auxiliary material), 1.0 percent of glycine (accounting for 2.5 percent of the auxiliary material) and 7.5 percent of calcium oxide (accounting for 18.8 percent of the auxiliary material) are mixed to form the auxiliary material. To the calcium chloride solution of comparative example 1, 1.0 wt% of the corrosion inhibitor composition of example 5 was added, and according to general principles of corrosion experiments on metals and alloys GB/T19291-2006, the corrosion rate was 0.0051mm/a and the corrosion inhibition rate was 93.7%.

Example 6: 10.0 wt% of the corrosion inhibitor composition of example 5 was added to the calcium chloride solution of comparative example 1, and the corrosion rate was 0.0044mm/a and the corrosion inhibition rate was 94.6% according to the general principles of corrosion experiments on metals and alloys GB/T19291-2006.

Example 7: the corrosion inhibitor composition comprises the following components in percentage by mass: 60.0 percent of calcium chloride, 20.0 percent of lithium chloride are taken as base materials, 0.8 percent of methylbenzotriazole (accounting for 4.0 percent of the auxiliary materials), 5.0 percent of calcium gluconate (accounting for 25.0 percent of the auxiliary materials), 5.0 percent of dimethylketoxime (accounting for 25.0 percent of the auxiliary materials), 5.0 percent of calcium ascorbate (accounting for 25.0 percent of the auxiliary materials), 0.6 percent of calcium citrate (accounting for 3.0 percent of the auxiliary materials), 0.6 percent of calcium glycinate (accounting for 3.0 percent of the auxiliary materials) and 3.0 percent of calcium oxide (accounting for 15.0 percent of the auxiliary materials) are mixed to form the auxiliary materials. To the calcium chloride solution of comparative example 1, 1.0 wt% of the corrosion inhibitor composition of example 7 was added, and according to general principles of corrosion experiments on metals and alloys GB/T19291-one 2006, the corrosion rate was 0.0078mm/a and the corrosion inhibition rate was 90.4%.

Example 8: 10.0 wt% of the corrosion inhibitor composition of example 7 was added to the lithium bromide solution of comparative example 2, and the corrosion rate was 0.0125mm/a and the corrosion inhibition rate was 91.2%, as determined according to the general principles of corrosion experiments on metals and alloys GB/T19291-one 2006.

Example 9: the corrosion inhibitor composition comprises the following components in percentage by mass: 70.0 percent of lithium bromide is taken as a base material, 1.0 percent of benzotriazole (accounting for 3.3 percent of the auxiliary material), 5.0 percent of lithium gluconate (accounting for 16.7 percent of the auxiliary material), 7.0 percent of dimethylketoxime (accounting for 23.3 percent of the auxiliary material), 8.0 percent of lithium erythorbate (accounting for 26.7 percent of the auxiliary material), 2.0 percent of lithium citrate (accounting for 6.7 percent of the auxiliary material), 2.0 percent of glycine (accounting for 6.7 percent of the auxiliary material) and 5.0 percent of lithium hydroxide (accounting for 16.7 percent of the auxiliary material) are mixed to form the auxiliary material. 5.0 wt% of the corrosion inhibitor composition of example 9 was added to the lithium bromide solution of comparative example 2, and the corrosion rate was 0.0083mm/a and the corrosion inhibition rate was 94.2%, as determined according to general principles of corrosion experiments on metals and alloys GB/T19291-one 2006.

Example 10: 70.0 wt% of the corrosion inhibitor composition in the embodiment 9 is added into water, and stirred uniformly to prepare a solution, according to the general principle of corrosion experiments on metals and alloys GB/T19291-one 2006, the corrosion rate is 0.0074mm/a, and the corrosion inhibition rate is 94.8% after comparison with the comparative example 2.

Example 11: the corrosion inhibitor composition comprises the following components in percentage by mass: 78.0 percent of calcium chloride is taken as a base material, 0.5 percent of methylbenzotriazole (accounting for 2.3 percent of the auxiliary material), 5.0 percent of calcium gluconate (accounting for 22.7 percent of the auxiliary material), 2.0 percent of dimethylketoxime (accounting for 9.1 percent of the auxiliary material), 6.5 percent of calcium ascorbate (accounting for 29.5 percent of the auxiliary material), 2.0 percent of calcium citrate (accounting for 9.1 percent of the auxiliary material), 2.0 percent of calcium glycinate (accounting for 9.1 percent of the auxiliary material) and 4.0 percent of calcium oxide (accounting for 18.2 percent of the auxiliary material) are mixed to form the auxiliary material. The corrosion inhibitor composition in example 11 is prepared into 30.0 wt% aqueous solution with water, and according to general principles of corrosion experiments on metals and alloys GB/T19291-2006, the corrosion rate is 0.0038mm/a, and the corrosion inhibition rate is 95.3% compared with that of comparative example 1.

Example 12: to the calcium chloride solution of comparative example 1, 8.0 wt% of the corrosion inhibitor composition of example 11 was added, and according to general principles of corrosion experiments on metals and alloys GB/T19291-2006, the corrosion rate was 0.0046mm/a and the corrosion inhibition rate was 94.8%.

Example 13: the corrosion inhibitor composition comprises the following components in percentage by mass: 70.0 percent of lithium bromide is taken as a base material, 1.0 percent of benzotriazole (accounting for 3.3 percent of the auxiliary material), 12.0 percent of lithium gluconate (accounting for 40.0 percent of the auxiliary material), 2.0 percent of dimethylketoxime (accounting for 6.7 percent of the auxiliary material), 5.0 percent of ascorbic acid (accounting for 16.7 percent of the auxiliary material), 3.0 percent of lithium citrate (accounting for 10.0 percent of the auxiliary material), 2.0 percent of glycine (accounting for 6.7 percent of the auxiliary material) and 5.0 percent of lithium hydroxide (accounting for 16.7 percent of the auxiliary material) are mixed to form the auxiliary material. The corrosion inhibitor composition in example 13 is prepared into an 80.0 wt% aqueous solution with water, and according to general principles of corrosion experiments on metals and alloys GB/T19291-one 2006, the corrosion rate is 0.0091mm/a, and the corrosion inhibition rate is 93.6% after comparison with comparative example 2.

Example 14: 5.0 wt% of the corrosion inhibitor composition of example 13 was added to the lithium bromide solution of comparative example 2, and the corrosion rate was 0.0105mm/a and the corrosion inhibition rate was 92.6% according to general principles of corrosion experiments on metals and alloys GB/T19291-one 2006.

Example 15: the corrosion inhibitor composition comprises the following components in percentage by mass: 30.0 percent of calcium chloride is taken as a base material, 2.0 percent of benzotriazole (accounting for 2.9 percent of the auxiliary material), 28.0 percent of calcium gluconate (accounting for 40.0 percent of the auxiliary material), 3.0 percent of dimethylketoxime (accounting for 4.3 percent of the auxiliary material), 20.0 percent of calcium ascorbate (accounting for 28.6 percent of the auxiliary material), 6.0 percent of calcium citrate (accounting for 8.6 percent of the auxiliary material), 5.0 percent of calcium glycinate (accounting for 7.1 percent of the auxiliary material) and 6.0 percent of calcium oxide (accounting for 8.6 percent of the auxiliary material) are mixed to form the auxiliary material. The corrosion inhibitor composition in example 15 is prepared into 70.0 wt% aqueous solution with water, and according to general principle of corrosion test for metals and alloys GB/T19291-2006, the corrosion rate is 0.0036mm/a, and the corrosion inhibition rate is 95.6% after comparing with comparative example 2.

Example 16: to the calcium chloride solution of comparative example 1, 0.6 wt% of the corrosion inhibitor composition of example 13 was added, and according to general principles of corrosion experiments on metals and alloys GB/T19291-2006, the corrosion rate was 0.0042mm/a and the corrosion inhibition rate was 94.8%.