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Stripping solution and method for electrolytically removing chromium carbide film

A chromium carbide film and electrolytic stripping technology, which is applied to the stripping solution and field for electrolytic stripping of chromium carbide film, can solve the problem of easily damaged substrate, poor stripping solution stability, and inability to effectively and completely remove chromium carbide film. Removal and other issues to achieve the effect of effective withdrawal

Inactive Publication Date: 2011-11-09
SHENZHEN FUTAIHONG PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing method is to adopt the deplating solution that only contains single alkali metal hydroxide (as sodium hydroxide) to the electrolytic deplating method of chromium carbide film, the deplating solution stability of this single component is poor, adopts this deplating solution to not be able to Stable electrolytic deplating, so that the chromium carbide film cannot be effectively and completely removed, and it is easy to damage the substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Preparation of deplating solution

[0018] Slowly dissolve 70g of sodium hydroxide in 500ml of deionized water, then add 50g of sodium citrate, 30g of sodium gluconate, and 2g of sodium pentapolyphosphate, add deionized water after complete dissolution to make the solution volume 1L, and obtain a deplating solution.

[0019] 2. Electrolytic removal of chromium carbide film

[0020] Heat the deplating solution to 60-70°C, immerse the sample with a chromium carbide film layer with a thickness of about 2 μm formed on the surface of the stainless steel substrate in the deplating solution, and use the deplating solution as the electrolyte to form The stainless steel substrate with chromium carbide film layer is used as the anode, and the carbon plate is used as the cathode, with 5A / dm 2 Electrolyze for 6 minutes at a high current density to completely remove the chromium carbide film. After electrolytic deplating, the stainless steel substrate is washed and dried.

Embodiment 2

[0022] 1. Preparation of deplating solution

[0023] Slowly dissolve 60g of sodium hydroxide in 500ml of deionized water, then add 30g of sodium citrate, 40g of sodium gluconate, and 6g of sodium pentapolyphosphate. After complete dissolution, add deionized water to make the solution volume 1L to obtain a deplating solution.

[0024] 2. Remove the film layer

[0025] Heat the deplating solution to 60-70°C, immerse the sample with a chromium carbide film layer with a thickness of about 2 μm formed on the surface of the stainless steel substrate in the deplating solution, and use the deplating solution as the electrolyte to form The stainless steel substrate with chromium carbide film layer is used as the anode, and the carbon plate is used as the cathode, with 5A / dm 2 Electrolyze for 6 minutes at a high current density to completely remove the chromium carbide film. After electrolytic deplating, the stainless steel substrate is washed and dried.

Embodiment 3

[0027] 1. Preparation of deplating solution

[0028] Slowly dissolve 50g of sodium hydroxide in 500ml of deionized water, then add 20g of ethylenediaminetetraacetic acid (EDTA), 40g of sodium gluconate, and 4g of sodium pentapolyphosphate, add deionized water after complete dissolution to make the volume of the solution 1L, and obtain Deplating solution.

[0029] 2. Remove the film layer

[0030] Heat the deplating solution to 60-70°C, immerse the sample with a chromium carbide film layer with a thickness of about 3 μm formed on the surface of the stainless steel substrate in the deplating solution, and use the deplating solution as the electrolyte to form The stainless steel substrate with chromium carbide film layer is used as the anode, and the carbon plate is used as the cathode, with 6A / dm 2 Electrolyze for 5 minutes at a high current density to completely remove the chromium carbide film. After electrolytic deplating, the stainless steel substrate is washed and dried....

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Abstract

A stripping solution for a chromium carbide film provided by the invention is an aqueous solution containing alkali, promoter and additive, wherein, the alkali is a soluble alkali metal hydroxide and has the concentration of 20-200g / L, the promoter is a complexing agent with complexation with chromium ion and has the concentration of 20-150g / L, and the additive is one kind or the combination of sodium tripolyphosphate and pentaphosphate and has the concentration of 0.5-10g / L. The invention further provides a method using the stripping solution to electrolytically remove the chromium carbide film.

Description

technical field [0001] The invention relates to a stripping solution for electrolytically removing a chromium carbide film layer on the surface of a base material and a method for electrolytically removing the chromium carbide film layer by using the stripping solution. Background technique [0002] Coating technology has a wide range of applications in the industrial field. However, it is usually necessary to remove the coating in the following two situations: (1) after long-term use, the coating on the surface of the workpiece has been damaged or seriously aged, so that the coating needs to be removed and re-coated; (2) in production , the plated coating does not meet the quality requirements. In order to reduce losses and save costs, it is necessary to remove the coating and let the workpiece be reworked and re-coated. Therefore, how to completely remove the coating from the surface of the substrate without damaging the substrate is an important issue in industrial produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F5/00
CPCC25F3/02
Inventor 黄巍司国春宫红丽
Owner SHENZHEN FUTAIHONG PRECISION IND CO LTD
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