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Cyanide-free gold-imitating copper-zinc-tin alloy electroplating process for surface of carbon steel

An alloy electroplating, copper-zinc-tin technology is applied in the field of metal surface electroplating and cyanide-free imitation gold-copper-zinc-tin alloy plating process on carbon steel surface, which can solve the problem that the color stability and uniformity of the coating are difficult to control, and the cyanide-free imitation gold plating solution Not stable enough, unfavorable for mass production, etc., to achieve the effect of good anti-discoloration, short electroplating time, and maintenance cost saving

Inactive Publication Date: 2021-10-01
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cyanide is a highly toxic substance, and there are great safety risks in the links of transportation, storage, use, and wastewater treatment, and it is very easy to cause major safety accidents and vicious environmental pollution accidents, and there are huge safety hazards and environmental pressures
A small amount of cyanide-free imitation gold plating solutions are not stable enough, and most of them need to be heated during the electroplating process, which increases the cost of electroplating, accelerates the decomposition of the electrolyte, and the color stability and uniformity of the coating are not easy to control, which is not conducive to mass production

Method used

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  • Cyanide-free gold-imitating copper-zinc-tin alloy electroplating process for surface of carbon steel
  • Cyanide-free gold-imitating copper-zinc-tin alloy electroplating process for surface of carbon steel
  • Cyanide-free gold-imitating copper-zinc-tin alloy electroplating process for surface of carbon steel

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Effect test

Embodiment 1

[0043] The concentration of each component of the cyanide-free copper-zinc-tin alloy electroplating solution of the present embodiment is: potassium pyrophosphate 250g / L, copper pyrophosphate 22g / L, zinc sulfate 40g / L, tin protophosphate 2.1g / L, hydroxyethylidene Diphosphonic acid 12g / L, additive (cationic quaternary ammonium salt) 0.05 g / L, sodium saccharin 0.3g / L, 1,4-butynediol 0.2g / L, sodium saccharin and 1,4-butynediol A compound brightener is formed, and the solvent is deionized water; the pH of the electroplating solution is adjusted to 8.6 by potassium pyrophosphate and potassium hydroxide.

[0044] The process steps of electroplating cyanide-free imitation gold copper-zinc-tin alloy on carbon steel surface are as follows:

[0045] (1) Polish the sample, and then perform ultrasonic degreasing, pickling and activation treatment in sequence. Degreasing fluid: sodium hydroxide (NaOH) 5g / L, sodium carbonate (NaOH) 2 CO 3 ) 15g / L, trisodium phosphate (Na 3 PO 4 12H 2 ...

Embodiment 2

[0050] The concentration of each component of the cyanide-free copper-zinc-tin alloy electroplating solution of the present embodiment is: potassium pyrophosphate 280g / L, copper pyrophosphate 24g / L, zinc sulfate 45g / L, tin protophosphate 2.5g / L, hydroxyethylidene Diphosphonic acid 18g / L, additive epichlorohydrin condensate 0.4 g / L, sodium saccharin 0.4g / L, 1,4-butynediol 0.3g / L, sodium saccharin and 1,4-butynediol A compound brightener is formed, and the solvent is deionized water; the pH of the electroplating solution is adjusted to 8.2 by potassium pyrophosphate and potassium hydroxide.

[0051] The process steps of electroplating cyanide-free imitation gold copper-zinc-tin alloy on carbon steel surface are as follows:

[0052] (1) Polish the sample, and then perform ultrasonic degreasing, pickling and activation treatment in sequence. Degreasing liquid: sodium hydroxide 10g / L, sodium carbonate 20g / L, trisodium phosphate 25g / L, sodium silicate 8g / L, sodium dodecylbenzenesul...

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Abstract

The invention discloses a cyanide-free gold-imitating copper-zinc-tin alloy electroplating process for the surface of carbon steel. The process comprises the following steps of: immersing pretreated carbon steel to be electroplated into an electroplating bath filled with a pre-plating solution, and electroplating at room temperature to obtain carbon steel with a pre-plated copper layer, wherein the pre-plating solution is prepared by dissolving copper sulfate, potassium hydroxide, carboxylate, a sulfur-containing grain refiner and an amine-containing brightener in deionized water; and immersing the carbon steel with a pre-plated copper layer into an electroplating bath filled with an electroplating solution, and electroplating at room temperature to obtain the carbon steel of which the surface contains a gold-imitating plating layer containing three elements of copper, tin and zinc, wherein the electroplating solution is prepared by dissolving potassium pyrophosphate, copper pyrophosphate, zinc sulfate, stannous pyrophosphate, hydroxyethylidene-1, 1-diphosphonic acid, an additive and a brightener in deionized water. The obtained plating layer is high in quality, golden and uniform in color and good in discoloration resistance.

Description

technical field [0001] The invention relates to the improvement of metal surface electroplating technology, in particular to a cyanide-free imitation gold-copper-zinc-tin alloy electroplating process on the surface of carbon steel, which belongs to the technical field of metal electroplating. Background technique [0002] Copper and copper alloy electroplating is one of the most widely used plating types in the electroplating industry, and is widely used in electronics, aviation, aerospace, light industry, rail transit, machinery manufacturing and other industries; among them, copper-zinc-tin alloy is the most commonly used due to its golden and bright coating color. imitation gold plating. Limited by product performance requirements, the current copper-zinc-tin alloy electroplating (imitation gold electroplating) still mainly adopts cyanide electroplating process, which consumes a large amount of cyanide every year. Cyanide is a highly toxic substance, and there are great ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/10C25D3/38C25D3/58C25D5/36C23G1/19C23G1/08C23G1/06
CPCC25D5/10C25D3/38C25D3/58C25D5/36C25D5/627C23G1/19C23G1/08C23G1/081C23G1/063C23G1/065
Inventor 林修洲李明刚胡国辉郑丽刘阳王东风肖灵窦宝捷陈俊豪王豪
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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