阅读说明：本技术 耐酸雨电力铁塔结构件热浸锌生产方法 (acid rain resistant electric power iron tower structural member hot dip galvanizing production method ) 是由 覃世仁 黄东 陈树生 于 2019-10-19 设计创作，主要内容包括：本发明涉及一种耐酸雨电力铁塔结构件热浸锌生产方法,包括清理表面、清除油脂、水洗、酸洗除锈、中和清洗、助镀剂处理、热浸锌、冷却和钝化的过程制得。本发明所制得的工件具有抵抗酸雨腐蚀的能力,能使电力铁塔免受酸雨的腐蚀,提高电力铁塔的寿命；在生产过程中,对操作工人的酸碱气体伤害较低,有效保证了操作工人生产健康安全。(the invention relates to a hot dip galvanizing production method for an acid rain resistant electric power iron tower structural part, which comprises the steps of surface cleaning, grease removing, water washing, acid cleaning and rust removing, neutralization cleaning, plating assistant agent treatment, hot dip galvanizing, cooling and passivation. The workpiece prepared by the invention has the capability of resisting acid rain corrosion, so that the electric iron tower can be prevented from being corroded by acid rain, and the service life of the electric iron tower is prolonged; in the production process, the harm to acid and alkali gases of operators is low, and the production health and safety of the operators are effectively ensured.)

1. a hot dip galvanizing production method for an acid rain resistant electric power iron tower structural member is characterized by comprising the following steps: comprises the following production steps:

A. Cleaning the surface: after the welding of the structural part is finished, the structural part and a plurality of steel balls are put into a horizontal steel roller together for rolling, and welding slag, welding skin and an oxidation layer on the surface of the steel part are removed;

B. removing grease: hanging the cleaned workpiece on a lifting hook, vertically putting the workpiece into an alkaline solution pool, soaking for 3-5min to remove surface grease, and forcibly circulating the solution in the alkaline solution pool;

C. washing with water: after being lifted out of the alkali liquor pool, the alkali liquor enters the water pool for washing, and the lifting hook travels up and down for 3 times during washing;

D. acid pickling for rust removal: hanging out of the water tank, and soaking in acid liquor for 5-10 min;

E. neutralizing and cleaning: lifting out the acid liquid pool, entering a neutralization cleaning pool for cleaning, forcibly circulating the solution in the cleaning pool, and moving the lifting hook up and down for 3 times during cleaning, wherein the cleaning time is 20-30 s;

F. And (3) plating assistant agent treatment: hanging out of the neutralization cleaning pool, then putting into a plating assistant agent pot for dip dyeing of the plating assistant agent for 1min, and drying by hot air at 70-80 ℃;

G. hot dip galvanizing: hoisting the structural member into a hot-dip zinc bath for galvanizing, wherein the temperature of zinc liquid is 435-; 0.02-0.06% Ti; the balance of Zn; after soaking, cleaning ash on the upper surface of the zinc liquid, and slowly lifting by a lifting hook at a speed not higher than the flow speed of the zinc liquid;

I. and (3) cooling: after being lifted out of the hot-dip zinc pool, the hot-dip zinc pool enters a cooling water pool for cooling, the cooling water pool is circulating water, and the lifting hook travels up and down for 3 times during cooling;

J. Passivation: hanging out of the cooling water tank, entering into a passivation tank for soaking and passivation, hanging out after soaking for 1-3min, rinsing with supercooled water, and drying with hot air to obtain the final product.

2. The method for producing the electric power iron tower connecting piece with the uniform surface zinc layer thickness by the hot dip galvanizing according to claim 1, characterized in that: in the step B, the alkali liquor pool is a compound solution of 3% of sodium hydroxide Na (OH) and sodium dodecyl sulfate, and the weight ratio of Na (OH) to sodium dodecyl sulfate is 4:1, the temperature of the solution is 70-80 ℃.

3. the method for producing the electric power iron tower connecting piece with the uniform surface zinc layer thickness by the hot dip galvanizing according to claim 1, characterized in that: and D, a 12-16% aqueous solution compounded by hydrochloric acid HCl and phosphoric acid is arranged in the acid liquid pool in the step D, and the volume ratio of the hydrochloric acid to the phosphoric acid is as follows: and 3:1, adding sodium dodecyl sulfate into the pool to ensure that the concentration of the sodium dodecyl sulfate in the solution is 4 percent.

4. The method for producing the electric power iron tower connecting piece with the uniform surface zinc layer thickness by the hot dip galvanizing according to claim 1, characterized in that: and the neutralization cleaning pool in the step E is a 1% sodium carbonate Na2CO3 solution, and the temperature of the neutralization cleaning solution is 70-90 ℃.

5. The method for producing the electric power iron tower connecting piece with the uniform surface zinc layer thickness by the hot dip galvanizing according to claim 1, characterized in that: and the plating assistant in the step F comprises the following components of a mixed solution of ammonium chloride and zinc chloride: the weight ratio between ZnCl2 and NH4Cl was 3: 2.

Technical Field

The invention relates to a production method of a power iron tower structural member, in particular to a hot dip galvanizing production method of an acid rain resistant power iron tower structural member.

Background

the hot dip galvanizing is characterized in that a cleaned iron part is immersed in a zinc bath to react steel and molten zinc to generate an alloyed involucra, so that a substrate and a coating are combined, and the hot dip galvanizing has the advantages of uniform coating, strong adhesive force, long service life and the like, is frequently used in industrial metal workpieces, and is widely applied to the fields of automobiles, buildings, household appliances, chemical industry, machinery, petroleum, metallurgy, light industry, traffic, electric power, aviation, ocean engineering and the like.

in the field of electric power, the hot dip galvanizing treatment of the surface of a workpiece is an essential process, and a good surface zinc layer can ensure that a steel structure electric iron tower exposed in the field for a long time can obtain good protection of rust prevention and corrosion prevention, and the principle is as follows: firstly, a steel member is coated in a dense zinc layer, so that the steel member is prevented from being corroded by external moisture and corrosive gas liquid in a contact manner; secondly, the standard electrode potential of zinc is-0.76V, for a steel matrix, a zinc coating belongs to an anodic coating, under the same contact corrosion condition, the zinc coating is preferentially corroded, and a steel member is protected by utilizing an electrochemical principle. Therefore, all steel components in the electric power tower need to be subjected to surface hot galvanizing treatment. In the work piece hot dip galvanizing process, the process comprises the following steps: removing grease on the surface of a workpiece, pickling for derusting, neutralizing and cleaning, soaking a plating assistant agent, hot dipping zinc, cooling, soaking passivation solution for passivation treatment, and inspecting a finished product.

With the development of industrialization, tens of thousands of tons of waste gas are discharged into the atmosphere every year from industrial waste gas, automobile exhaust gas and the like, molecules such as sulfur, nitrogen oxide and the like in the waste gas are combined with water vapor in the atmosphere to be dissolved, and then acidic liquid with the pH value of 4.5-5.8 is formed and falls to the ground through rainfall or snowfall, and most areas in the south and north of China are eroded and threatened by acid rain to different degrees every year. Because many thermal power stations are used in China, and the coal resources in China belong to the types with more sulfur-containing elements, a large amount of sulfur-containing bituminous coal burnt every year is discharged into the atmosphere, and therefore the acid rain in China mainly takes the sulfur-containing acid rain as the main component. The electric power iron tower is mostly supposed to be in the field without any shielding, the acid rain drops to the electric power iron tower to cause serious corrosion to the iron tower, the service life of the electric power iron tower is greatly reduced, huge economic loss is brought to the country and people, and the acid rain resistance of a hot dip galvanizing layer of the electric power iron tower structural part is improved, so that the corrosion caused by the acid rain can be greatly delayed.

relevant publications were retrieved as follows:

1. A hot-dip zinc alloy-plated steel sheet having excellent corrosion resistance and an outer surface and a method for producing the same; application No.: CN 201380039077.3; the applicant: POSCO corporation; and (3) abstract: the present invention relates to a hot dip zinc alloy-plated steel sheet widely used in automobiles, household appliances, building materials, and the like, and a method for producing the same. In the present invention, a Zn-Al-Mg hot dip galvanizing bath is used to manufacture a hot dip galvanized steel sheet, and a small amount of Ga or In is added to the hot plating bath In order to suppress oxidation of Mg In the hot plating bath, thereby obtaining excellent corrosion resistance and an outer surface of the plated steel sheet manufactured herein.

disclosure of Invention

The invention aims to provide a hot dip galvanizing production method for an acid rain resistant electric power iron tower structural part, wherein the prepared workpiece has the acid rain corrosion resistance capability, so that the electric power iron tower can be prevented from being corroded by acid rain, and the service life of the electric power iron tower is prolonged; in the production process, the harm to acid and alkali gases of operators is low, and the production health and safety of the operators are effectively ensured.

the technical scheme of the invention is realized as follows:

The hot-dip galvanizing production method of the electric power iron tower connecting piece with the uniform surface zinc layer thickness is characterized by comprising the following steps of: comprises the following production steps:

A. cleaning the surface: after the workpiece is welded, putting the workpiece and a plurality of steel balls into a horizontal steel roller together, and rolling to remove welding slag, welding skin and an oxidation layer on the surface of the steel part; in the steel roller, collision friction occurs between workpieces and between the workpieces and steel balls, welding slag on the surfaces of the workpieces and oxide skin on the surfaces are removed, surface impurities are reduced to enter a hot-dip galvanizing process, and the pressure of the pretreatment of the hot-dip galvanizing of the workpieces is reduced.

B. removing grease: hanging the cleaned workpiece on a lifting hook, vertically putting the workpiece into an alkaline solution pool, soaking for 3-5min to remove surface grease, and forcibly circulating the solution in the alkaline solution pool; when the surface of a workpiece is subjected to machining and welding procedures, the surface is stained with grease such as cutting fluid, emulsified oil, mineral engine oil and the like, the grease needs to be removed before hot dip galvanizing is carried out, alkali liquor can react with the grease on the surface of the workpiece, the solution in an alkali liquor pool is forcibly extracted from the lower part to circulate to the pool and flow out, and the reaction speed of the alkali liquor and the grease is increased.

C. washing with water: after being lifted out of the alkali liquor pool, the alkali liquor enters the water pool for washing, and the lifting hook travels up and down for 3 times during washing; the washing process cleans the alkali liquor attached to the surface of the workpiece so as to prevent the next process from entering the acid liquor to generate neutralization reaction, and the lifting hook repeatedly travels up and down to stir water flow, so that the washing process is more thorough.

D. acid pickling for rust removal: hanging out of the water tank, and soaking in acid liquor for 5-10 min; the acid liquor reacts with the ferric oxide on the surface of the workpiece, thereby playing the role of rust removal.

E. Neutralizing and cleaning: lifting out the acid liquid pool, entering a neutralization cleaning pool for cleaning, forcibly circulating the solution in the cleaning pool, and moving the lifting hook up and down for 3 times during cleaning, wherein the cleaning time is 20-30 s; residual acid liquor on the surface of the workpiece is washed away in the neutralization and cleaning process, and the lifting hook travels up and down for 3 times in the water washing process; and cleaning the acid liquor attached to the surface of the workpiece in the water washing process.

F. And (3) plating assistant agent treatment: hanging out of the neutralization cleaning pool, then putting into a plating assistant agent pot for dip dyeing of the plating assistant agent for 1min, and drying by hot air at 70-80 ℃;

G. hot dip galvanizing: the workpiece is hoisted into a hot-dip zinc bath for galvanizing, the temperature of zinc liquid is 435-; 0.02-0.06% titanium Ti; the balance of zinc and Zn; after soaking, cleaning ash on the upper surface of the zinc liquid, and slowly lifting by a lifting hook at a speed not higher than the flow speed of the zinc liquid;

the nickel metal element added is as follows: after the surface of the nickel Ni-containing coating layer is subjected to acid rain etching, znsno4.4zn (OH) is produced as a product, while the pure zinc coating layer produces partial ZnO in addition to znsno4.4zn (OH), and znsno4.4zn (OH) continues to decompose ZnO. The migration of ions in the corrosion reaction mainly passes through a corrosion product film, the ZnSO4.4Zn (OH) conductivity is small, the ionization reaction can be inhibited, the ZnO conductivity is large, the ionization reaction can be accelerated, and the existence of nickel Ni can stabilize the ZnSO4.4Zn (OH) and generate little ZnO, so the corrosion rate of the surface of the zinc film can be reduced.

Wherein the addition of titanium metal elements: titanium is used as a high-passivation-state metal, a titanium oxide TiO2 film with good stability, strong binding force and excellent protection property is easily formed in a natural environment, so that a plating layer is in a natural passivation state and has strong self-healing property, and after a wound is received, the passivation film can be automatically repaired. The reason for this is that the passivation film has a large electrical resistance and can inhibit the progress of the ionization reaction.

I. And (3) cooling: after being lifted out of the hot-dip zinc pool, the hot-dip zinc pool enters a cooling water pool for cooling, the cooling water pool is circulating water, and the lifting hook travels up and down for 3 times during cooling; the proper cooling rate of the workpiece can meet the requirement of fast production rhythm, the surface smoothness of the galvanized layer is higher, on the other hand, the galvanized layer can generate crack cracks under the condition of fast quenching, and therefore, the cooling rate is preferably controlled to be reduced from the temperature of the zinc liquid to below 60 ℃ in 3min on average.

J. passivation: hanging out of the cooling water tank, entering into a passivation tank for soaking and passivation, hanging out after soaking for 1-3min, rinsing with supercooled water, and drying with hot air to obtain a finished product; the passivation solution comprises the following components: chromic anhydride and nitric acid, soaking for 30s-1min, hanging out, standing in air for 10s, and rinsing with cold water.

in the step B, the alkali liquor pool is a compound solution of 3% of sodium hydroxide Na (OH) and sodium dodecyl sulfate C12H25SO4Na, wherein the weight ratio of Na (OH) to sodium dodecyl sulfate is 4:1, the temperature of the solution is 70-80 ℃; the grease and sodium hydroxide generate saponification reaction, and reactants are dissolved in water to clean the grease; on the other hand, the sodium dodecyl sulfate has stronger cleaning capability on mineral engine oil and can play a good role in removing mineral engine oil residues in workpieces; the sodium dodecyl sulfate is used as a surfactant and also has a foaming effect, generated foam floats on the surface of the alkali liquor to form a gas isolation layer, so that irritant odor generated by heating the alkali liquor can be isolated below the liquid level, and the injury of the irritant odor to operators is reduced.

and D, a 12-16% aqueous solution compounded by hydrochloric acid HCl and phosphoric acid is arranged in the acid liquid pool in the step D, and the volume ratio of the hydrochloric acid to the phosphoric acid is as follows: 3:1, adding sodium dodecyl sulfate into the pool to ensure that the concentration of the sodium dodecyl sulfate in the solution is 4 percent; phosphoric acid is used as a pickling agent, so that on one hand, the phosphoric acid can generate a phosphating reaction with the surface of an iron piece, and the phosphated iron piece surface has stronger anti-corrosion capability, so that a steel structural part is prevented from being corroded from the inside; on the other hand, the use of phosphoric acid also reduces the generation of acid mist, and avoids harming the health of workers. Hydrochloric acid is used as a volatile chemical substance, after sodium dodecyl sulfate is added, foam is formed on the upper surface of an acid liquid pool and floats on the surface of acid liquid, a gas isolation layer is formed, irritant odor generated by partial hydrochloric acid can be isolated below the liquid level, and the harm of the irritant odor to operators is reduced.

the neutralization cleaning pool in the step E is 1% sodium carbonate Na2CO3 solution, and the temperature of the neutralization cleaning solution is 70-90 ℃;

And the plating assistant in the step F comprises the following components of a mixed solution of ammonium chloride and zinc chloride: the weight ratio between ZnCl2 and NH4Cl was 3: 2. The plating assistant agent forms a salt film on the surface of the workpiece to protect the pickled iron piece from oxidation reaction with oxygen in the air, and on the other hand, after the workpiece enters the zinc liquid, the iron matrix on the surface has an active effect and reacts with the zinc liquid in a short time to generate an iron-zinc alloy layer, and finally the combination of the iron matrix and the zinc liquid is ensured.

Compared with the prior art, the invention has the prominent substantive characteristics and remarkable progress that:

1. according to the hot dip galvanizing production method for the acid rain resistant electric iron tower structural part, which is prepared by the production method, by adding other alloy components, the acid rain corrosion resistant surface formed on the surface of a workpiece can greatly reduce the rate of electrochemical corrosion of the surface; on the other hand, through the pretreatment process and the pretreatment process of the production method, the structural part is thoroughly cleaned and decontaminated, the internal impurities are less, and the possibility of corrosion of the iron part from the inside is prevented.

2. In the production process of the invention, less acid chemical harmful gas is generated when the structural member is treated, the physical health of operators is effectively protected, and the workshop production environment is improved.

Detailed Description