Electropolishing method for cylindrical stainless steel thin-walled bellows

A stainless steel and cylindrical technology, applied in the coating process of metal materials, etc., can solve problems such as unstable quality, poor mechanical strength, and poor control of the inner cathode, and achieve the effect of good gloss, satisfactory thickness and roughness

Active Publication Date: 2020-12-11
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Thin-walled cylinders with a wall thickness of 0.27mm to 0.30mm have poor mechanical strength and are easily deformed under force, making it difficult to carry out anode conductive clamping;
[0005] (2) The cathode in the cylindrical product is not well controlled, and the power lines are unevenly distributed, resulting in mottled appearance on the inner surface;
[0006] (3) The state of the polished surface is not good, there are pitting, yin and yang surfaces, etc., and the quality is unstable

Method used

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  • Electropolishing method for cylindrical stainless steel thin-walled bellows

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The electropolishing method for cylindrical stainless steel thin-walled bellows of the present invention comprises the following steps:

[0031] Step 1: Degreasing the stainless steel bellows blank

[0032] The composition of degreasing solution is: NaOH 20~50g / L, NaOH 2 CO 3 30~80g / L,Na 3 PO 4 12H 2 O 20~60g / L, Na 2 SiO 3 1~6g / L;

[0033] The preferred value is: NaOH 30g / L, NaOH 2 CO 3 60g / L, Na 3 PO 4 12H 2 O 55g / L, Na 2 SiO 3 5g / L.

[0034] Step 2: pickling the corrugated pipe after degreasing in step 1

[0035] The composition of the pickling solution is: H 2 SO 4 80g / L~100g / L, HNO 3 60g / L~90g / L, HF 40g / L~50g / L, sulfonated coal or urotropine 1g / L~1.5g / L; time 5min~10min;

[0036] The preferred value is: H 2 SO 4 90g / L, HNO 3 80g / L, HF 45g / L, urotropine 1g / L, time 8min.

[0037] Step 3: Fix the corrug...

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Abstract

The invention belongs to the technical field of aerospace surface treatment and particularly relates to an electropolishing method for a cylindrical stainless steel thin-wall corrugated pipe. The electropolishing method comprises the following steps that 1, degreasing treatment is conducted on a stainless steel corrugated pipe blank; 2, acid pickling treatment is conducted on the corrugated pipe degreased in the step 1; 3, the corrugated pipe obtained after acid pickling in the step 2 is clamped; 4, electropolishing treatment is conducted on the corrugated pipe clamped in the step 3; 5, passivating treatment is conducted on the corrugated pipe obtained after electropolishing in the step 4; and 6, after electropolishing, the surface is cleaned with distilled water and is dried through blowing. According to the shape of the compensator corrugated pipe, a special clamping tool and an inner cathode are prepared, meanwhile technological parameters are adjusted again, and electropolishing production is conducted with special bath solution. The electropolishing method is used, the inner and outer surfaces of the polished corrugated pipe are good in glossiness, the thickness and roughnessmeet tolerance requirements, and the surfaces are free of pit or spot phenomenon.

Description

technical field [0001] The invention belongs to the technical field of aerospace surface treatment, and in particular relates to an electropolishing method for a cylindrical stainless steel thin-wall corrugated pipe. Background technique [0002] The bellows used for the compensator are made of austenitic stainless steel. The product is welded into a cylinder from thin-walled plates with a thickness of 0.27mm to 0.30mm, pressed into a corrugated structure, and then welded into a compensator. The entire processing process is delicate and complicated; the use process The inner surface of the medium product is in direct contact with liquid hydrogen, liquid oxygen and other fuels, and any excess or surface adsorption is not allowed to produce excess. Therefore, it is of great significance to reduce the surface friction coefficient and discover the fine defects and mechanical damage on the surface of raw materials by proper surface treatment. [0003] Electropolishing of metal m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/24C23G1/19C23G1/08C23C22/50
CPCC23C22/50C23G1/086C23G1/19C25F3/24
Inventor 张晶李吉丹余剑张联英陈伟郑玉杰丁振常帅杨立乐王绍成安全强张苗贾方舟曹歆昕
Owner CAPITAL AEROSPACE MACHINERY
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