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Corrosion prevention method of stainless steel weld joint or bent area

A bending area, stainless steel technology, applied in the direction of welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problems of intergranular corrosion in the grinding area, reduce the service life of parts, and shorten the cycle, so as to achieve the service life The effect of improving, increasing the service life and avoiding intergranular corrosion

Inactive Publication Date: 2016-12-07
SHAANXI AIRCRAFT CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this treatment method is: after long-term use in salt spray, humid and hot environments, intergranular corrosion will occur again in the polished area, and yellow and light brown corrosion spots will appear again, requiring anti-corrosion treatment again
As the number of grinding increases, the number of intergranular corrosion and corrosion will increase, and the cycle will become shorter and shorter, reducing the service life of parts

Method used

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  • Corrosion prevention method of stainless steel weld joint or bent area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1Cr18Ni9Ti-G33×1.5 pipes were selected and welded into a 300mm×150mm rectangular test piece by manual argon tungsten arc welding. The salt spray test and the damp heat resistance test were carried out for 168 hours each.

[0028] In the salt spray test, there is no corrosion at the weld seam after 56 hours, no corrosion at the weld seam at 112 hours, and no corrosion at the weld seam at 168 hours.

[0029] In the humidity and heat resistance test, no corrosion was observed at the weld seam after 56 hours, no corrosion at the weld seam was observed at 112 hours, and no corrosion at the weld seam was observed at 168 hours.

Embodiment 2

[0031] Select the 1Cr18Ni9Ti-δ2 plate, and use manual argon tungsten arc welding to weld it into a 300mm×150mm×150mm L-shaped test piece, and carry out the salt spray resistance test and damp heat resistance test, each for 168 hours.

[0032] In the salt spray test, there is no corrosion at the weld seam after 56 hours, no corrosion at the weld seam at 112 hours, and no corrosion at the weld seam at 168 hours.

[0033] In the humidity and heat resistance test, no corrosion was observed at the weld seam after 56 hours, no corrosion at the weld seam was observed at 112 hours, and no corrosion at the weld seam was observed at 168 hours.

Embodiment 3

[0035] Select 1Cr18Ni9Ti-φ20 rods, use manual tungsten argon arc welding to weld 8-shaped tangential test pieces, and conduct salt spray resistance test and damp heat resistance test, each for 168 hours.

[0036] In the salt spray test, there is no corrosion at the weld seam after 56 hours, no corrosion at the weld seam at 112 hours, and no corrosion at the weld seam at 168 hours.

[0037] In the humidity and heat resistance test, no corrosion was observed at the weld seam after 56 hours, no corrosion at the weld seam was observed at 112 hours, and no corrosion at the weld seam was observed at 168 hours.

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Abstract

The invention belongs to surface treatment technology, and relates to an anticorrosion method for stainless steel weld seams or bending areas. It is characterized in that the anti-corrosion steps are as follows: determine the intergranular corrosion area A of the material; perform mechanical grinding on the intergranular corrosion area A of the material; grind the intergranular corrosion area A of the material; carry out pickling and passivation treatment on the parts. The invention proposes an anti-corrosion method for stainless steel welds or bending areas, which greatly increases the anti-corrosion ability of 1Cr18Ni9Ti stainless steel in salt spray and hot and humid environments, avoids intergranular corrosion of parts again, and improves the use of parts life.

Description

technical field [0001] The invention belongs to surface treatment technology, and relates to an anticorrosion method for stainless steel weld seams or bending areas. Background technique [0002] The stainless steel material 1Cr18Ni9Ti disclosed in "Aeronautical Materials Technology" (2012) published by Aviation Industry Press is a general-purpose chromium-nickel austenitic stainless steel with a carbon content of ≤0.12%, and reducing the carbon content to below 0.03% can fundamentally solve the intergranular problem. Corrosion, adding titanium to the steel is to prevent the tendency of intergranular corrosion of general austenitic steel after heat preservation in the range of 500-800 ℃. This steel has good resistance to uniform corrosion of oxidative acid, but poor resistance to stress corrosion. In the case where resistance to intergranular corrosion is not required, heat treatment is generally not required after welding. During welding or bending, at a high temperature o...

Claims

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Application Information

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IPC IPC(8): B24B1/00C23G1/08B23K37/00
CPCB24B1/00B23K37/00C23G1/08
Inventor 朱建涛金利孙榕王朋飞冯燕施惠娟张凌云吴绍云姚学荣米鹏阳史左敏张剑肖爱华王双
Owner SHAANXI AIRCRAFT CORPORATION
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