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Electrochemical polishing liquid for inner wall of stainless steel pipe as well as polishing method and device of electrochemical polishing liquid

A stainless steel tube and polishing liquid technology, applied in the field of stainless steel surface treatment, can solve problems such as affecting polishing quality, affecting polishing effect, and being difficult to dissipate, and achieving the effect of ensuring polishing quality and excellent electrochemical polishing surface quality

Active Publication Date: 2013-12-11
安徽笃舜智能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is chromic anhydride in the electrochemical polishing liquid, which is extremely harmful to the human body. Chromic anhydride contains hexavalent chromium, which is one of the banned chemicals; while using glycerin, a large number of bubbles will be generated during electrochemical polishing, which are not easy to dissipate, and will also cause Affect the polishing effect; in addition, the electrochemical polishing fluid will corrode the workpiece before the power is applied, which will affect the polishing quality

Method used

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  • Electrochemical polishing liquid for inner wall of stainless steel pipe as well as polishing method and device of electrochemical polishing liquid
  • Electrochemical polishing liquid for inner wall of stainless steel pipe as well as polishing method and device of electrochemical polishing liquid
  • Electrochemical polishing liquid for inner wall of stainless steel pipe as well as polishing method and device of electrochemical polishing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The inner wall of a 304 stainless steel pipe with a length of Ф20 and a length of 12 meters is electrochemically polished. The composition and weight of the polishing solution and the operating parameters are as follows.

[0042] Phosphoric acid 79.5 parts, sulfuric acid 45.1 parts, ethylene glycol 1.7 parts, citric acid 1.7 parts, polyvinylpyrrolidone 0.1 parts, ethylenediaminetetraacetic acid 0.8 parts, saccharin 0.3 parts, water 100 parts. Temperature 40℃, current density 10A / dm 2 , Cathode moving speed 50mm / min.

[0043] The density of phosphoric acid is 1.7, the density of sulfuric acid is 1.84; the viscosity average molecular weight of polyvinylpyrrolidone is 35000;

[0044] The surface roughness of the inner wall of the stainless steel tube treated by the process in this example can reach 0.01 μm, and the inner surface of the austenitic stainless steel tube achieves a mirror effect, and the reflectivity is greater than 98%.

Embodiment 2

[0046] The inner wall of Ф20 304 stainless steel pipe with a length of 12 meters is electrochemically polished. The composition and weight of the polishing solution and the operating parameters are as follows:

[0047] 105 parts of phosphoric acid, 60 parts of sulfuric acid, 3 parts of ethylene glycol, 3 parts of citric acid, 0.2 parts of polyvinylpyrrolidone, 2 parts of ethylenediaminetetraacetic acid, 0.8 parts of saccharin, and 100 parts of water. Temperature 60℃, current density 30A / dm 2, Cathode moving speed 50mm / min.

[0048] The density of phosphoric acid is 1.7, the density of sulfuric acid is 1.84; the viscosity average molecular weight of polyvinylpyrrolidone is 30000;

[0049] Cathode moving speed 30mm / min.

[0050] The surface roughness of the inner wall of the stainless steel tube treated by the process in this example can reach 0.01 μm, and the inner surface of the austenitic stainless steel tube achieves a mirror effect, and the reflectivity is greater than 98...

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Abstract

The invention discloses electrochemical polishing liquid for an inner wall of a stainless steel pipe as well as a polishing method and device of the electrochemical polishing liquid. The electrochemical polishing liquid comprises the following components in parts by weight: 100 parts of water, 75-107 parts of phosphoric acid, 37-64 parts of sulfuric acid, 0.8-3 parts of ethanediol, 0.1-3 parts of citric acid, 0.1-2 parts of ethylenediamine tetraacetic acid, 0.01-0.2 part of polyvinylpyrrolidone and 0.2-0.8 part of saccharin, wherein the density of phosphoric acid is 1.7, the density of sulfuric acid is 1.84, and the viscosity average molecular weight of polyvinylpyrrolidone is 30,000-50,000. According to the invention, the surface of the inner wall of the stainless steel pipe is polished by a mobile cathode and the circulating electrochemical polishing liquid, a stainless steel workpiece is basically not corroded by the adopted electrochemical polishing liquid, the polishing quality is guaranteed, and the excellent quality of the electrochemically polished surface of the inner wall of the stainless steel pipe can be formed by the method.

Description

technical field [0001] The invention relates to a stainless steel surface treatment method and device. Background technique [0002] Stainless steel has good mechanical properties and corrosion resistance, and is widely used in aerospace, marine, nuclear energy, medical equipment, petrochemical and other fields, and is mainly used for fluid transportation pipelines for high-end products. In recent years, with the development and innovation of technology, people's demand for stainless steel products has been increasing, and the requirements for its surface quality have also been continuously improved, especially for the surface roughness of the inner wall of precision stainless steel tubes, even reaching 0.01μm. In order to achieve the effect of reducing the resistance of the inner wall to the fluid and the adsorption of materials on the inner wall, it is difficult to achieve such a high surface roughness requirement by using the existing technology. [0003] Electrochemical...

Claims

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Application Information

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IPC IPC(8): C25F3/24
Inventor 岳彩民黄志荣
Owner 安徽笃舜智能装备有限公司
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