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Pollution-free bright pickling process for copper and brass parts

A bright pickling and pollution-free technology, applied in the surface pickling process of copper and brass parts, can solve the problem of easy decomposition of hydrogen peroxide and achieve the effect of keeping the surface bright

Inactive Publication Date: 2011-10-26
江西省汉霖科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a pollution-free bright pickling process for copper and brass parts. By adding a stabilizer that inhibits the decomposition of hydrogen peroxide into the pickling solution, the problem of nitric acid solution pickling in the traditional technology can be solved. The problem that hydrogen peroxide is easily decomposed during pickling with a large amount of yellow smoke and hydrogen peroxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) Mix 8L of sodium lauryl sulfate, 12L of OP emulsifier and TX-1020L to make D11 stabilizer. Mix 200L oxalic acid and 300L citric acid to prepare D11 light-extracting agent.

[0011] (2) Mix 450L of hydrogen peroxide with a mass fraction of 30%, 40L of D11 stabilizer, 4L of sulfuric acid with a density of 1.84 g / ml, and 506L of water to make a pickling solution, add the pickling solution to the pickling tank and heat to 44°C, Keep the temperature constant, immerse the copper and brass parts in the pickling pool for 0.5 minutes, take them out until the surface of the copper and brass parts is brown, and clean the pickling solution on the surface of the copper and brass parts with running water;

[0012] (3) Mix 500L of D11 light-emitting agent and 500L of water to make a film remover, add the film remover to the film remover tank, and keep it at room temperature. Immerse the copper and brass parts obtained in step (2) in the film remover tank for 2 minutes Take it out...

Embodiment 2

[0014] (1) Mix 25L of sodium lauryl sulfate, 10L of OP emulsifier and TX-1015L to prepare D11 stabilizer. Mix 300L oxalic acid and 200L citric acid to make D11 light-extracting agent.

[0015] (2) 500L of hydrogen peroxide with a mass fraction of 30%, 50L of D11 stabilizer, 5L of sulfuric acid with a density of 1.84 g / ml, and 445L of water are mixed to make a pickling solution, and the pickling solution is added to the pickling tank and heated to 45°C. Keep the temperature constant, immerse the copper and brass parts in the pickling pool for 1 minute, take them out until the surface of the copper and brass parts is brown, and clean the pickling solution on the surface of the copper and brass parts with running water;

[0016] (3) Mix 500L of D11 luminescent agent and 500L of water to make a film remover, add the film remover to the film remover tank, and keep it at room temperature, then immerse the copper and brass parts obtained in step (2) into the film remover tank for 4 m...

Embodiment 3

[0018] (1) Mix 20L of sodium lauryl sulfate, 20L of OP emulsifier and TX-1020L to make D11 stabilizer. Mix 250L of oxalic acid and 250L of citric acid to prepare D11 light-extracting agent.

[0019] (2) Mix 550L of hydrogen peroxide with a mass fraction of 30%, 60L of D11 stabilizer, 6L of sulfuric acid with a density of 1.84 g / ml, and 394L of water to make a pickling liquid, add the pickling liquid to the pickling tank and heat to 46°C, Keep the temperature constant, immerse the copper and brass parts in the pickling pool for 1.5 minutes, take them out until the surface of the copper and brass parts is brown, and clean the pickling solution on the surface of the copper and brass parts with running water;

[0020] (3) Mix 500L of D11 luminescent agent and 500L of water to make a film remover, add the film remover to the film remover tank, and keep it at room temperature, then immerse the copper and brass parts obtained in step (2) in the film remover tank for 6 minutes Take i...

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PUM

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Abstract

The invention relates to a pollution-free bright pickling process for copper and brass parts, which belongs to the field of surface treatment of the copper and the brass parts, and comprises the steps of mixing hydrogen peroxide, a D11 stabilizer, ammonium sulphate and water for preparing pickling solution, adding the pickling solution into a pickling tank, heating, immerging the copper and the brass parts into the pickling tank till the surfaces of the copper and the brass parts become brown, and taking out; and mixing a D11 bright dipping agent with the water for preparing a film removing agent, adding the film removing agent into a film removing tank, immerging the obtained copper and the brass parts into the film removing tank for 2-5 minutes and taking out. The pollution-free bright pickling process has the benefits of using the hydrogen peroxide bright pickling solution to replace nitric acid solution or mixed solution of nitric acid and sulfuric acid and solving the problem of causing harm and pollution to an operator, a machine device and the ambient environment; the D11 stabilizer is added in the pickling solution for inhibiting the decomposition of the hydrogen peroxide;and using the film removing agent to carry out film removing on brown oxide films on the surfaces of the copper and the brass parts after bright pickling, thoroughly removing the oxide films on the surfaces of the copper and the brass parts and keeping the surfaces bright.

Description

technical field [0001] The invention belongs to the field of surface treatment of copper and brass parts, in particular to the surface pickling process of copper and brass parts. Background technique [0002] Pickling of copper and brass parts refers to a method of using acid solution to remove the oxide film on the surface of copper and brass parts. Because of its simple process, low cost and obvious cleaning quality, it has been widely used in modern industrial production. widely used. At present, the traditional pickling method for copper and brass parts is to use nitric acid solution or a mixed solution of nitric acid and sulfuric acid for pickling treatment, but this method will produce a large amount of nitrogen dioxide (yellow smoke) during the pickling process. Nitrogen will make breathing difficult, damage the cornea of ​​the eyes, irritate the skin, trachea and lungs, increase the incidence of lung cancer, and seriously threaten the health of the staff; nitrogen d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/10C23F3/06
Inventor 魏敏真杜刚何生龙
Owner 江西省汉霖科技有限公司