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Electrolytic stripper for copper alloy surface coating and preparation method thereof

An electrolytic stripping agent and copper alloy technology, applied in the field of stripping agents, can solve problems such as personal injury, non-compliance with safety, environmental protection requirements, and threats to the personal safety of staff, and achieve a reduction in surface tension, good peeling effect, and good surface gloss. Effect

Active Publication Date: 2016-11-30
江门市瑞期精细化学工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolytic strippers sold in the market generally contain cyanide or nitrobenzene derivatives. The following problems may occur during use: (1) Cyanide is highly toxic. If workers’ safety protection is not in place or the operation process is not Be careful, it is easy to cause personal injury and seriously threaten the personal safety of the staff; (2) the derivatives of nitrobenzene are toxic and difficult to degrade, which will cause great harm to the staff's body and the natural environment, and do not meet the safety and environmental protection requirements; ( 3) Wastewater treatment is difficult. Wastewater containing cyanide or nitrobenzene derivatives needs to be recycled by professional companies, resulting in increased factory costs

Method used

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  • Electrolytic stripper for copper alloy surface coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] According to the weight percentage in Table 1, add sulfuric acid with a concentration of 98wt% into tap water; wait until the temperature drops to 60°C, then add sodium lauryl sulfate, sodium citrate and triazole; fully dissolve, stir evenly, and shape.

[0017] Gained 200ml stripping agent is mixed with 200ml water, 500ml concentration 98wt% sulfuric acid, the anode is the copper alloy surface coating hanger to be stripped, the cathode is a pure lead plate, and the anode current density: 5A / dm 2 , Stripping voltage: 8V, operating temperature: 45°C, stripping speed: 4.5μm / min for nickel and chromium, 15A / dm 2 , Stripping time: until the stripping is complete (as the coating is stripped gradually, the operating current will drop rapidly, and when it drops below 1% of the initial current, the coating has been completely stripped off), after the stripping is completed, take out the workpiece and wash it with water.

[0018] The results show that there is no coating residue...

Embodiment 2

[0020] According to the weight percentage in Table 1, add sulfuric acid with a concentration of 95wt% into tap water; wait until the temperature drops to 50°C, then add sodium lauryl sulfate, sodium citrate and triazole; fully dissolve, stir evenly, and shape.

[0021] Gained 200ml stripping agent is mixed with 250ml water, 570ml concentration 98wt% sulfuric acid, the anode is the copper alloy surface coating hanger to be stripped, the cathode is a lead-tin alloy plate, and the anode current density: 30A / dm 2 , Stripping voltage: 10V, operating temperature: 60°C, stripping speed: 4.5μm / min for nickel and chromium, 15A / dm 2 , Stripping time: until the stripping is complete (as the coating is stripped off gradually, the operating current will drop rapidly, and when it drops below 5% of the initial current, the coating has been completely stripped off), after the stripping is completed, take out the workpiece and wash it with water.

[0022] The results show that there is no coat...

Embodiment 3

[0024] According to the weight percentage in Table 1, add sulfuric acid with a concentration of 96wt% into tap water; wait until the temperature drops to 40°C, then add sodium lauryl sulfate, sodium citrate and triazole; fully dissolve, stir evenly, and shape.

[0025] Gained 200ml stripping agent is mixed with 400ml water, 600ml concentration 98wt% sulfuric acid, the anode is the copper alloy surface coating hanger to be stripped, the cathode is a lead-tin alloy plate, and the anode current density: 20A / dm 2 , Stripping voltage: 9V, operating temperature: 50°C, stripping speed: 4.5μm / min for nickel and chromium, 15A / dm 2 , Stripping time: until the stripping is complete (as the coating is stripped off gradually, the operating current will drop rapidly, and when it drops below 3% of the initial current, the coating has been completely stripped off), after the stripping is completed, take out the workpiece and wash it with water.

[0026] The results show that there is no coati...

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Abstract

The invention discloses an electrolytic stripping agent for a copper alloy surface coating and a preparation method of the electrolytic stripping agent. The electrolytic stripping agent comprises 15-80wt% of a sulphuric acid, 0.1-8wt% of lauryl sodium sulfate, 0.5-35wt% of citrate, 0.005-5wt% of 1,2,3-1H-Triazole and 15-65wt% of water. The electrolytic stripping agent disclosed by the invention has a good stripping effect which achieves or exceeds the stripping effect of the other stripping agents of the same kind. Raw materials free from poison or pollution are adopted in a formula of the electrolytic stripping agent, so that the purposes of high safety, environment protection and cost reduction are achieved. The electrolytic stripping agent has a wide application range, and is suitable for electrolytic stripping of defective products of surface coating materials of copper and copper alloys. After the electrolytic stripping, wastewater treatment is simple, the cost can be reduced, and the benefits can be improved.

Description

technical field [0001] The invention relates to a stripper, in particular to an electrolytic stripper for a copper alloy surface coating and a preparation method thereof. Background technique [0002] Since the electroplating factory will encounter various uncertain factors (such as machinery and equipment, materials, working methods, environment, management, etc.) Waste increases costs. In order to reduce waste and save costs, various methods are usually used to strip off the surface coating of defective workpieces to realize the recycling of workpieces. The commonly used stripping methods are divided into chemical stripping and electrolytic stripping. [0003] The electrolytic stripping of the copper alloy surface coating is to peel off the coating on the surface of the copper alloy surface coating workpiece by electrolysis, without damaging the copper alloy surface coating material, and realize the recycling of the workpiece. The electrolytic strippers sold in the mark...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/02
Inventor 洪条民
Owner 江门市瑞期精细化学工程有限公司
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