Deplating method for deplating brass surface tin-nickel coating

A technology of tin-nickel plating and brass, applied in the field of electroplating, can solve the problems of strong product corrosion, heavy responsibility, physical injury of operators, etc., and achieve the effect of simple operation steps and low cost

Inactive Publication Date: 2015-12-23
CHANGZHOU OPTICAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cyanide is highly toxic, and the residual liquid is not easy to handle, which is seriously harmful to human body and environmental pollution.
In addition, the storage and distribution requirements of such highly toxic substances are relatively strict, and the responsibility is heavy. Therefore, it is necessary to seek to replace the deplating method containing cyanide, or use sulfuric acid or nitric acid as the main material. The deplating solution prepared by this method is acidic. Strong, highly corrosive to the product, and will decompose and release toxic gas during the deplating process, which will cause harm to the operator's body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] First, put 200g egg white in a container, add deionized water to it, the mass ratio of egg white and deionized water is 3:1, stir well, add papain with 10% egg white mass to it, and adjust the temperature to 50°C , and using a sodium hydroxide solution with a mass concentration of 5% to adjust the pH to 7.5, stir for 2 hours, and let stand for 20 minutes to obtain amino acids for subsequent use; get 200g of fat and place it in a container, add lipase to it, and the amount added is the same as that of the fat The mass ratio is 1:2, stir well, mix evenly, let stand for 15min, get fatty acid, set aside; put 250g sucrose in a container, add deionized water until deionized water submerges sucrose, after soaking for 30min, add starch Enzyme, the mass ratio of the added amount to sucrose is 1:2, and keep warm in a 45°C water bath for 3h, then add amylase, the added amount to the mass ratio of sucrose is 1:4, continue to keep warm for 1.5h, naturally Cooling to obtain hexose; i...

example 2

[0021] First, take 100g egg white and place it in a container, add deionized water to it, the mass ratio of egg white and deionized water is 3:1, stir well, add papain with 5% egg white mass to it, and adjust the temperature to 35°C , and using a sodium hydroxide solution with a mass concentration of 5% to adjust the pH to 7, stir for 1 hour, and let stand for 15 minutes to obtain amino acids for subsequent use; get 150 g of fat and place it in a container, add lipase to it, and the amount added is the same as that of the fat The mass ratio is 1:2, stir well, mix evenly, let stand for 10min, get fatty acid, and set aside; put 200g sucrose in a container, add deionized water until deionized water submerges sucrose, after soaking for 25min, add starch Enzyme, the mass ratio of the added amount to sucrose is 1:2, and keep warm in a water bath at 40°C for 2 hours, then add amylase, the added amount to the mass ratio of sucrose is 1:4, continue to keep warm for 1 hour, and cool natu...

example 3

[0023] First take 150g of egg white and place it in a container, add deionized water to it, the mass ratio of egg white and deionized water is 3:1, stir well, add papain with 7% egg white mass to it, and adjust the temperature to 40°C , and using a sodium hydroxide solution with a mass concentration of 5% to adjust the pH to 7, stir for 1 hour, and let stand for 17 minutes to obtain amino acids for subsequent use; get 170 g of fat and place it in a container, add lipase to it, and the amount added is the same as that of the fat The mass ratio is 1:2, stir well, mix evenly, let stand for 12min, get fatty acid, set aside; put 220g sucrose in a container, add deionized water until deionized water submerges sucrose, after soaking for 27min, add starch Enzyme, the mass ratio of the added amount to sucrose is 1:2, and keep warm in a water bath at 42°C for 2 hours, then add amylase, the added amount to the mass ratio of sucrose is 1:4, continue to keep warm for 1 hour, and cool natura...

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PUM

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Abstract

The invention relates to a deplating method for deplating a brass surface tin-nickel coating, and belongs to the technical field of electroplating. Prepared amino acid is mixed with hexose and fatty acid, acetylcoenzyme is added in the mixture and stirred, and after stirring is finished, the brass surface tin-nickel coating raw material is added in the mixture, active mud is introduced, and bottom aeration is carried out. After aeration is ended, citroyl synthetase and other enzymes are added, aeration treatment is carried out, and then a brass base body is taken out. The deplating method has the beneficial effects that the surface of brass is bright, the color of the base body is basically unchanged, no pin holes exist, and the corrosion volume is low; and meanwhile poisonous gas cannot be generated, and the environment is protected.

Description

technical field [0001] The invention relates to a stripping method for stripping the tin-nickel coating on the surface of brass, belonging to the technical field of electroplating. 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, and the coating needs to be removed and re-coated; (2) in production, The coated 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 production. [0003] Therefore, the chemical dissolution method should be used for deplating. Some...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/14C23F1/44
Inventor 陈毅忠薛红娟
Owner CHANGZHOU OPTICAL MATERIAL
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