阅读说明：本技术 一种提高不锈钢防锈性能的方法和防锈物质 (Method for improving rust-proof performance of stainless steel and rust-proof substance ) 是由 潘利功 王耀武 于 2019-10-19 设计创作，主要内容包括：本发明涉及不锈钢领域,尤其涉及一种提高不锈钢防锈性能的方法和防锈物质。包含如下步骤,a.将不锈钢表面进行快速清洗；b.钝化；c.稳定；d.中和；e.封闭；f.烘干：将烘干箱升温到100℃,将上述烘干的工件放置其中烘干10-15分钟,然后取出。采用如上技术方案的本发明,相对于现有技术有如下有益效果：操作简单,不需要专门设备,适合批量生产,在同等的检测条件下,数据显示防锈周期明显延长。(The invention relates to the field of stainless steel, in particular to a method for improving the rust-proof performance of stainless steel and a rust-proof substance. The method comprises the following steps of a, rapidly cleaning the surface of the stainless steel; b. passivating; c. stabilizing; d. neutralizing; e. sealing; f. drying: and heating the drying box to 100 ℃, placing the dried workpiece in the drying box for drying for 10-15 minutes, and taking out. Compared with the prior art, the invention adopting the technical scheme has the following beneficial effects: the method is simple to operate, does not need special equipment, is suitable for batch production, and obviously prolongs the rust prevention period of data display under the same detection condition.)

1. An antirust substance for improving the antirust performance of stainless steel is characterized by comprising 3-8% by mass of nitric acid, 1-5% by mass of potassium dichromate and the balance of water.

2. An antirust substance for improving the antirust performance of stainless steel is characterized by comprising 15-25% by mass of nitric acid, 10-13% by mass of hydrofluoric acid, less than 2% by mass of hydrochloric acid and the balance of water.

3. A method for improving the rust-proof performance of stainless steel is characterized by comprising the following steps,

a. rapidly cleaning the surface of the stainless steel;

b. passivation: heating the passivation solution to 70-75 ℃, wherein the passivation solution stock solution comprises 3-8% by mass of nitric acid, 1-5% by mass of potassium dichromate and the balance of water; proportioning: the volume ratio of the stock solution to water is 1: 5-15, the workpiece after rapid cleaning is soaked for 15-30 minutes, the workpiece is required to be completely soaked and fully contacted, and the workpieces cannot be mutually superposed; after soaking, washing the surface of the workpiece by using flowing water to ensure that the surface is clean and has no residue;

c. and (3) stabilizing: adding a heat stabilizer to 65 ℃, and proportioning a stabilizer stock solution: 15-25% of nitric acid, 10-13% of hydrofluoric acid, less than 2% of hydrochloric acid and the balance of water, wherein the proportion of the stabilizer to the stock solution and the water is 1: 5-15; soaking the passivated workpiece for 15 minutes; the workpieces are required to be completely soaked and fully contacted, and the workpieces cannot be mutually superposed; after soaking, washing the surface of the workpiece by using flowing water to ensure that the surface is clean and has no residue;

d. neutralizing: soaking the stabilized workpiece in 5% sodium carbonate solution for neutralization; the workpieces are required to be completely soaked and fully contacted, and the workpieces cannot be mutually superposed; after soaking, washing the surface of the workpiece by using flowing water to ensure that the surface is clean and has no residue;

e. and (3) sealing: heating the sealing agent to 45 ℃, soaking the neutralized workpiece for 10 minutes, and then taking out and drying;

f. drying: and heating the drying box to 100 ℃, placing the dried workpiece in the drying box for drying for 10-15 minutes, and taking out.

4. The method for improving the rust-proof performance of the stainless steel according to claim 1, wherein the rapid cleaning is to remove 434 pollutants such as oxide skin, metal dust, oil stains and the like on the surface of the stainless steel powder metallurgy part, then soak the stainless steel powder metallurgy part in the rapid cleaning agent for 5 to 10 minutes at normal temperature, and the workpiece is required to be completely soaked and fully contacted; after soaking, the surface of the workpiece is washed by flowing water, so that the surface is clean and has no residue.

5. The method for improving the rust inhibitive performance of stainless steel according to claim 3, wherein said sealer in sealing comprises paraffin wax and mineral oil, the melting point of which is 60 ℃ to 66 ℃, the ratio of paraffin wax and mineral oil is 15 mg/mL to 45mg/mL, and said mineral oil is branched chain paraffin.

6. The method for improving the rust-proof performance of the stainless steel according to claim 4, wherein the components of the quick stainless steel cleaning agent are as follows: hydrogen peroxide with the dilution ratio of 1:3.5, hydrochloric acid with the relative density of 1.5-2.0 and hydrofluoric acid with the dilution ratio of 1:3.5, and the components are mixed with water according to the volume ratio of 2-5% of hydrogen peroxide, 5-10% of hydrochloric acid and 1.5-4.5% of hydrofluoric acid.

Technical Field

The invention relates to the field of stainless steel, in particular to a method for improving the rust-proof performance of stainless steel and a rust-proof substance.

Background

Because of the requirements of the application environment of the powder metallurgy stainless steel, the surface of the powder metallurgy stainless steel can not be subjected to oil rust prevention treatment, and the conventional method adopts replacement water or drying water to ensure that the powder metallurgy stainless steel contains less water or contains water step by step, thereby achieving the purpose of rust prevention. The defects of the prior art are as follows: the water of the stainless steel product can not be completely removed, so that the product has short actual rust-producing period or easily rusts under a specific environment.

Disclosure of Invention

The purpose of the invention is as follows: in order to provide a method and a rust preventive substance for improving rust preventive properties of stainless steel with a higher effect, a plurality of substantial effects of the embodiments are specifically aimed at.

In order to achieve the purpose, the invention adopts the following technical scheme:

the first scheme is as follows:

an antirust substance for improving the antirust performance of stainless steel is characterized by comprising 3-8% by mass of nitric acid, 1-5% by mass of potassium dichromate and the balance of water.

Scheme II:

an antirust substance for improving the antirust performance of stainless steel is characterized by comprising 15-25% by mass of nitric acid, 10-13% by mass of hydrofluoric acid, less than 2% by mass of hydrochloric acid and the balance of water.

The third scheme is as follows:

a method for improving the rust-proof performance of stainless steel is characterized by comprising the following steps,

a. rapidly cleaning the surface of the stainless steel;

b. passivation: heating the passivation solution to 70-75 ℃, wherein the passivation solution stock solution comprises 3-8% by mass of nitric acid, 1-5% by mass of potassium dichromate and the balance of water; proportioning: the volume ratio of the stock solution to water is 1: 5-15, the workpiece after rapid cleaning is soaked for 15-30 minutes, the workpiece is required to be completely soaked and fully contacted, and the workpieces cannot be mutually superposed; after soaking, washing the surface of the workpiece by using flowing water to ensure that the surface is clean and has no residue;

c. and (3) stabilizing: adding a heat stabilizer to 65 ℃, and proportioning a stabilizer stock solution: 15-25% of nitric acid, 10-13% of hydrofluoric acid, less than 2% of hydrochloric acid and the balance of water, wherein the proportion of the stabilizer to the stock solution and the water is 1: 5-15; soaking the passivated workpiece for 15 minutes; the workpieces are required to be completely soaked and fully contacted, and the workpieces cannot be mutually superposed; after soaking, washing the surface of the workpiece by using flowing water to ensure that the surface is clean and has no residue;

d. neutralizing: soaking the stabilized workpiece in 5% sodium carbonate solution for neutralization; the workpieces are required to be completely soaked and fully contacted, and the workpieces cannot be mutually superposed; after soaking, the surface of the workpiece is washed by flowing water, so that the surface is clean and has no residue.

e. And (3) sealing: heating the sealing agent to 45 ℃, soaking the neutralized workpiece for 10 minutes, and then taking out and drying; the sealant comprises solid paraffin with a melting point of 60-66 ℃ and mineral oil, wherein the ratio of the solid paraffin to the mineral oil is 15-45mg/mL, and the mineral oil is branched paraffin.

f. Drying: and heating the drying box to 100 ℃, placing the dried workpiece in the drying box for drying for 10-15 minutes, and taking out.

According to a further technical scheme, the rapid cleaning is to remove 434 pollutants such as oxide skin, metal dust, oil stains and the like on the surface of the stainless steel powder metallurgy part, then soak the stainless steel powder metallurgy part in the rapid cleaning agent for 5-10 minutes at normal temperature, and the workpiece is required to be completely soaked and fully contacted; after soaking, the surface of the workpiece is washed by flowing water, so that the surface is clean and has no residue.

Compared with the prior art, the invention adopting the technical scheme has the following beneficial effects: the method is simple to operate, does not need special equipment, is suitable for batch production, and obviously prolongs the rust prevention period of data display under the same detection condition.

Drawings

To further illustrate the present invention, further description is provided below with reference to the accompanying drawings: FIG. 1 is a process flow diagram.

Detailed Description

The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. The patent provides a plurality of parallel schemes, and different expressions belong to an improved scheme based on a basic scheme or a parallel scheme. Each solution has its own unique features.

1. And (3) quick cleaning: removing 434 pollutants such as oxide skin, metal dust, oil stain and the like on the surface of the stainless steel powder metallurgy part, then soaking in the stainless steel quick cleaning agent for 5-10 minutes at normal temperature, and requiring the workpiece to be completely soaked and fully contacted. After soaking, the surface of the workpiece is washed by flowing water, so that the surface is clean and has no residue.

2. Passivation: heating HS-100 passivation solution (the ratio of stock solution to water is 1: 5-15) to 70-75 ℃, and then soaking the workpieces in the step 1) for 15-30 minutes, wherein the workpieces are required to be completely soaked and fully contacted, and the workpieces cannot be mutually overlapped. After soaking, the surface of the workpiece is washed by flowing water, so that the surface is clean and has no residue.

Wherein, the stock solution ratio of the HS-100 passivation solution is as follows: 3 to 8 percent of nitric acid, 1 to 5 percent of potassium dichromate and the balance of water.

3. And (3) stabilizing: heating HS-101 stabilizer (the ratio of stock solution to water is 1: 5-15) to 65 ℃, and soaking the workpiece in the step 2) for 15 minutes. The workpieces are required to be completely soaked and fully contacted, and the workpieces cannot be mutually superposed. After soaking, the surface of the workpiece is washed by flowing water, so that the surface is clean and has no residue.

Wherein, the stock solution ratio of the HS-101 stabilizer is as follows: 15-25% of nitric acid, 10-13% of hydrofluoric acid, less than 2% of hydrochloric acid and the balance of water

4. Neutralizing: soaking the workpiece in the step 3) in a 5% sodium carbonate solution for neutralization. The workpieces are required to be completely soaked and fully contacted, and the workpieces cannot be mutually superposed. After soaking, the surface of the workpiece is washed by flowing water, so that the surface is clean and has no residue.

5. And (3) sealing: heating the sealing agent to 45 ℃, soaking the workpiece in the step 4) for 10 minutes, and then taking out and drying.

6. Drying: heating the drying box to 100 ℃, placing the workpiece in the step 5) into the drying box for drying for 10-15 minutes, and then taking out.

Rust area comparison results (commercially available stainless steel purchased as a conventional method) for the same work piece and under the same conditions;

it should be noted that the plurality of schemes provided in this patent include their own basic schemes, which are independent of each other and are not restricted to each other, but they may be combined with each other without conflict, so as to achieve a plurality of effects.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and the invention is to be limited to the embodiments described above.