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A corrosion-resistant treatment process for austenitic stainless steel

A technology for austenitic stainless steel and treatment process, which is applied in the field of austenitic stainless steel corrosion resistance treatment process, can solve problems such as difficulty, high cost, and inability to improve the corrosion resistance level of stainless steel, achieve short treatment time, improve corrosion resistance level, The effect of the simple and easy process method

Active Publication Date: 2019-01-18
SHANGHAI JIANYE TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the anti-corrosion treatment method of austenitic stainless steel is mainly to improve the performance by changing the composition of stainless steel. It will be very difficult to do anti-corrosion treatment
The third method is various stainless steel derusting pastes. This method can only remove rust and cannot improve the corrosion resistance of stainless steel.

Method used

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  • A corrosion-resistant treatment process for austenitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 304 (DN20) stainless steel pipe corrosion resistance treatment process

[0026] (1) Empty the material in the 304 stainless steel pipe to ensure that there are no flammable and explosive substances. Use manual or mechanical grinding to remove rust on the surface of the stainless steel pipe to meet the requirements of rust removal grade Sa2.5 and roughness Rz30~70vm.

[0027] (2), winding ribbon-shaped cotton material on the stainless steel pipe, the cotton material bound on the steel pipe is closely arranged, and the winding thickness is controlled at 0.5cm;

[0028] (3) The cotton material is wrapped with 60-mesh stainless steel wire mesh, the stainless steel wire mesh fully covers the cotton material, and the length of one electrochemical treatment is controlled at 3m; and the polarized power cord is connected to both ends of the stainless steel wire mesh;

[0029] (4), add nitric acid, the electrolytic solution that sodium nitrate is formed to cotton material, make c...

Embodiment 2

[0037] 304 (DN20) stainless steel pipe corrosion resistance treatment process

[0038] (1) Empty the material in the 304 stainless steel pipe to ensure that there are no flammable and explosive substances. Use manual or mechanical grinding to remove rust on the surface of the stainless steel pipe to meet the requirements of rust removal grade Sa2.5 and roughness Rz30vm.

[0039] (2), winding strip cotton material on the stainless steel pipe, the cotton material bound on the steel pipe is closely arranged, and the winding thickness is controlled at 1cm;

[0040] (3) Cotton material is wrapped with 20-mesh stainless steel wire mesh, the stainless steel wire mesh fully covers the cotton material, and the length of one electrochemical treatment is controlled at 2m; and polarized power lines are connected at both ends of the stainless steel wire mesh;

[0041] (4), add nitric acid, sodium nitrate electrolyte solution to the cotton material, make the cotton material moist, but just ...

Embodiment 3

[0045] 304 (DN20) stainless steel pipe corrosion resistance treatment process

[0046] (1) Empty the material in the 304 stainless steel pipe to ensure that there are no flammable and explosive substances. Use manual or mechanical grinding to remove rust on the surface of the stainless steel pipe to meet the requirements of rust removal grade Sa2.5 and roughness Rz70vm.

[0047] (2), winding ribbon-shaped cotton material on the stainless steel pipe, the cotton material bound on the steel pipe is closely arranged, and the winding thickness is controlled at 0.8cm;

[0048] (3) The cotton material is wrapped with 80-mesh stainless steel wire mesh, the stainless steel wire mesh fully covers the cotton material, and the length of one electrochemical treatment is controlled at 5m; and the polarized power cord is connected to both ends of the stainless steel wire mesh;

[0049] (4), add nitric acid, the electrolytic solution that sodium nitrate is formed to cotton material, make cott...

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Abstract

The invention relates to a corrosion resistant treatment technology of austenitic stainless steel. The corrosion resistant treatment technology of the austenitic stainless steel comprises the following steps that (1), rust removing, washing and dry wiping are conducted on the surface of an austenitic stainless steel substrate; (2) the surface of the treated austenitic stainless steel substrate is coated with a cotton material, the cotton material is further coated with a stainless steel screen mesh, and polarized power lines are clamped at the two ends of the stainless steel screen mesh; and (3) an electrolyte solution is dripped into the cotton material to enable the cotton material to be wet, electric polarization treatment, washing and dry wiping are conducted, and thus the corrosion resistant treatment of the austenitic stainless steel is completed. Compared with the prior art, the treatment technology is good in corrosion resistant treatment effect, generates no pollution on the environment, and is simple and practicable, does not change original properties, such as strength, electrical conductivity and thermal conductivity, of the substrate, is short in treatment time, and the like.

Description

technical field [0001] The invention relates to the field of anti-corrosion treatment, in particular to a process for anti-corrosion treatment of austenitic stainless steel. Background technique [0002] With the development of society and the improvement of people's living needs, more and more attention has been paid to anti-corrosion work. However, due to the use of a large number of stainless steel components in petrochemical, aerospace, nuclear power and other industries, the corrosion of stainless steel components becomes prominent. At present, among stainless steel components, the application of austenitic stainless steel accounts for the largest proportion, so the corrosion resistance treatment of austenitic stainless steel is of great significance. [0003] At present, the anti-corrosion treatment method of austenitic stainless steel is mainly to improve the performance by changing the composition of stainless steel. It will be very difficult to do anti-corrosion t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F15/00
CPCC23F15/00
Inventor 王登堂王凯夏欢钟翔
Owner SHANGHAI JIANYE TECH ENG