Method for improving corrosion resistance of 1Cr17Ni2 martensitic stainless steel fastener

A martensitic stainless steel, 1cr17ni2 technology, applied in metal material coating process and other directions, can solve problems such as poor corrosion resistance, improve corrosion resistance, avoid surface corrosion, and facilitate daily analysis and maintenance.

Inactive Publication Date: 2019-03-19
河南航天精工制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for improving the corrosion resistance of 1Cr17Ni2 martensitic stainle

Method used

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  • Method for improving corrosion resistance of 1Cr17Ni2 martensitic stainless steel fastener

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Effect test

Embodiment 1

[0021] Embodiment 1 of the method for improving the corrosion resistance of 1Cr17Ni2 martensitic stainless steel fasteners of the present invention adopts the following steps:

[0022] 1) Put the fastener in lye (sodium hydroxide 220g / L, potassium permanganate 70g / L, solvent is water) and cook at 95°C for 25min to loosen the scale, and the fastener after alkali boiling Place in electropolishing solution for electropolishing treatment; wash with water after treatment for later use;

[0023] The composition of the electropolishing solution is: sulfuric acid 200mL / L, phosphoric acid 650mL / L, chromic anhydride 80g / L, and the solvent is water; during electropolishing, the temperature is 80°C and the current density is 40A / dm 2 , The voltage is 15V, and the time is 1min.

[0024] 2) Place the electropolished fasteners in a passivation solution for passivation treatment; wash with water and dry for later use;

[0025] The composition of passivation solution is: nitric acid 350mL / L,...

Embodiment 2

[0028] Embodiment 2 of the method for improving the corrosion resistance of 1Cr17Ni2 martensitic stainless steel fasteners of the present invention adopts the following steps:

[0029] 1) Put the fastener in lye (sodium hydroxide 180g / L, potassium permanganate 60g / L, solvent is water) and cook at 90°C for 20min to loosen the scale, and the fastener after alkali boiling Place in electropolishing solution for electropolishing treatment; wash with water after treatment for later use;

[0030] The composition of the electropolishing solution is: sulfuric acid 175mL / L, phosphoric acid 600mL / L, chromic anhydride 65g / L, and the solvent is water; during electropolishing, the temperature is 75°C and the current density is 25A / dm 2 , The voltage is 12V, and the time is 1.5min.

[0031] 2) Place the electropolished fasteners in a passivation solution for passivation treatment; wash with water and dry for later use;

[0032] The composition of passivation solution is: nitric acid 300mL / ...

Embodiment 3

[0035] Embodiment 3 of the method for improving the corrosion resistance of 1Cr17Ni2 martensitic stainless steel fasteners of the present invention adopts the following steps:

[0036] 1) Put the fastener in lye (sodium hydroxide 250g / L, potassium permanganate 80g / L, solvent is water) and cook at 100°C for 30 minutes to loosen the scale, and the fastener after alkali boiling Place in electropolishing solution for electropolishing treatment; wash with water after treatment for later use;

[0037] The composition of the electropolishing solution is: sulfuric acid 150mL / L, phosphoric acid 500mL / L, chromic anhydride 50g / L, and the solvent is water; during electropolishing, the temperature is 70°C and the current density is 15A / dm 2 , the voltage is 10V, and the time is 2min.

[0038] 2) Place the electropolished fasteners in a passivation solution for passivation treatment; wash with water and dry for later use;

[0039] The composition of passivation solution is: nitric acid 25...

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Abstract

The invention relates to a method for improving corrosion resistance of a 1Cr17Ni2 martensitic stainless steel fastener. The method comprises the following steps that 1) electric polishing is conducted, the 1Cr17Ni2 martensitic stainless steel fastener is immersed in an electric polishing solution for electric polishing treatment, and cleaning is conducted for later use after the treatment; 2) passivation is conducted, the fastener after the electric polishing treatment is immersed into a passivation solution for passivation treatment, and cleaning and drying are conducted for later use afterthe treatment; and 3) sealing is conducted, the fastener after the passivation treatment is immersed in a sealed liquid for sealing treatment. According to the method, the 1Cr17Ni2 martensitic stainless steel fastener is subjected to the electric polishing treatment, the passivation treatment and the sealing treatment, so that the surface smoothness of the fastener is effectively improved, the uniformity and compactness of a passivation film layer are improved, the defects of a traditional process are eliminated, the salt mist resistance test time of the fastener reaches 48 hours or above, andthe corrosion resistance of the corresponding fastener is remarkably improved.

Description

technical field [0001] The invention belongs to the anticorrosion field of fasteners, and in particular relates to a method for improving the corrosion resistance of 1Cr17Ni2 martensitic stainless steel fasteners. Background technique [0002] In the aviation and aerospace fields, martensitic stainless steel (such as 1Cr17Ni2) fasteners are widely used for their excellent performance and low price. For a long time, the traditional anti-corrosion method for surface treatment of this type of fasteners is to firstly remove the scale produced on the surface of the fasteners after heat treatment by sandblasting, and then complete the overall anti-corrosion through passivation treatment. However, this traditional treatment method has poor corrosion resistance due to factors such as surface roughness after treatment, and can no longer meet the current anticorrosion requirements for aviation and aerospace fasteners. [0003] Luo Qingye et al. conducted research on the anticorrosion...

Claims

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Application Information

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IPC IPC(8): C25F3/24C23C22/50C23C22/82
CPCC25F3/24C23C22/50C23C22/82
Inventor 李国伟郭绕龙孙晓军李召王保林
Owner 河南航天精工制造有限公司
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