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Cyanide-free and nickel-free electroplating method for copper-tin alloy

A copper-tin alloy, nickel electroplating technology, applied in liquid chemical plating, superimposed layer plating, metal material coating process and other directions, can solve the problems of easy cracks, poor wear resistance, low chromium thickness, etc. Brilliant, full, layered effect

Inactive Publication Date: 2015-06-03
温兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current "acid copper + chromium" process in the prior art, there is no excessive layer between copper and chromium, and the thickness of chromium is low and the internal stress is large. Direct electroplating on the copper layer is prone to cracks and has no corrosion resistance. Performance, low hardness, poor wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A copper-tin alloy cyanide-free nickel-free electroplating method, the electroplating method specifically comprises the following steps:

[0020] (1) Degreasing: the solution used in the degreasing is 10ml / l of phosphorus-free degreasing additive, the degreasing temperature is 50°C, and the degreasing time is 3min;

[0021] (2) Coarsening: the solution used for the coarsening is 380g / l of chromic anhydride and 390g / l of sulfuric acid; the roughening temperature is 65°C, and the roughening time is 8min;

[0022] (3) Neutralization: the solution used in the neutralization is sodium sulfite 2g / l; neutralize at room temperature for 3 minutes;

[0023] (4) heavy palladium: the solution used for the heavy palladium is colloidal palladium 1%, hydrochloric acid 120g / l; tin protochloride 2g / l; heavy palladium temperature 30 ℃, time 2min;

[0024] (5) Degumming: The solution used for the degumming is sodium hydroxide 2g / l; the degumming is carr...

Embodiment 2

[0031] A copper-tin alloy cyanide-free nickel-free electroplating method, the electroplating method specifically comprises the following steps:

[0032] (1) Degreasing: the solution used in the degreasing is 15ml / l of phosphorus-free degreasing additive, the degreasing temperature is 55°C, and the degreasing time is 4min;

[0033] (2) Coarsening: the solution used for the roughening is 400g / l of chromic anhydride and 410g / l of sulfuric acid; the roughening temperature is 70°C, and the roughening time is 10min;

[0034] (3) Neutralization: the solution used in the neutralization is sodium carbonate 3g / l; neutralize at room temperature for 4 minutes;

[0035] (4) heavy palladium: the solution used for the heavy palladium is colloidal palladium 3%, hydrochloric acid 150g / l; tin protochloride 3g / l; heavy palladium temperature 20 ℃, time 3min;

[0036] (5) Degumming: The solution used in the degumming is sodium hydroxide 4g / l; the degumming is ca...

Embodiment 3

[0043] A copper-tin alloy cyanide-free nickel-free electroplating method, the electroplating method specifically comprises the following steps:

[0044] (1) Degreasing: the solution used in the degreasing is 20ml / l of phosphorus-free degreasing additive, the degreasing temperature is 60°C, and the degreasing time is 5min;

[0045] (2) Coarsening: the solution used for the roughening is chromic anhydride 420g / l, sulfuric acid 430g / l; the roughening temperature is 75°C, and the roughening time is 12min;

[0046] (3) Neutralization: the solution used in the neutralization is sodium sulfite 5g / l; neutralize at room temperature for 5 minutes;

[0047] (4) heavy palladium: the solution used for the heavy palladium is colloidal palladium 5%, hydrochloric acid 150g / l; tin protochloride 5g / l; heavy palladium temperature 25 ℃, time 5min;

[0048] (5) Degumming: The solution used in the degumming is sodium hydroxide 5g / l; the degumming is carried out a...

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Abstract

The invention discloses a cyanide-free and nickel-free electroplating method for a copper-tin alloy. The method comprises the following steps: sequentially performing chemical copper plating, cyanide-free copper electroplating, sulfate copper electroplating, cyanide-free copper-tin alloy electroplating and lead-free chromium electroplating on a base material, wherein the electroplating solution of cyanide-free copper electroplating comprises 10-20g / l copper pyrophosphate and 230-280g / l sodium pyrophosphate; the electroplating solution of cyanide-free copper-tin alloy electroplating comprises 240-280g / l potassium pyrophosphate, 12-17g / l copper pyrophosphate and 10-20g / l sodium stannate; and the electroplating solution of lead-free chromium electroplating comprises 20-24g / l trivalent chromium and 65-85g / l boric acid. The electroplated parts are subjected to non-phosphorus oil removal, chemical copper plating, cyanide-free copper preplating, sulfate copper plating, cyanide-free copper-tin alloy plating and lead-free chromium plating, the requirement of constructing environment protection industry and intensive economy in China is met, cancerogenic substances are not contained in production, and the environmental pollution is further reduced.

Description

technical field [0001] The invention relates to a method for electroplating treatment on the surface of a plastic workpiece, in particular to a cyanide-free and nickel-free electroplating method for a copper-tin alloy. Background technique [0002] According to the EU Nickel Release Directive, 94 / 27 / EC document instruction, the product needs to be certified by SGS. If it exceeds the nickel release standard (Nickel Release Directive) required by the EU 94 / 27 / EC directive, it is not conducive to market and export business expansion. In order to reduce the toxicity of nickel to the human body, it has become a trend to adopt electroplating methods such as cyanide-free and nickel-free. In the current "acid copper + chromium" process in the prior art, there is no excessive layer between copper and chromium, and the thickness of chromium is low and the internal stress is large. Direct electroplating on the copper layer is prone to cracks and has no corrosion resistance. Performanc...

Claims

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Application Information

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IPC IPC(8): C25D5/12C25D5/56C25D3/38C25D3/06C25D3/56C23C18/40C23C28/02
Inventor 温兵
Owner 温兵
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