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Cyanide-free monovalent copper presoaking method of steel and iron parts and zinc alloy die castings

A zinc alloy and die-casting technology, which is applied in metal material coating technology, liquid chemical plating, coating, etc., can solve the problems of poor bonding force of copper plating, and achieve the purpose of improving the bonding force of the plating layer, reducing the concentration, and reducing the discharge potential Effect

Inactive Publication Date: 2014-10-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problem of poor bonding force of the copper coating obtained during cyanide-free alkaline copper plating of iron and steel parts and zinc alloy die-casting parts, and provides a cyanide-free coating for steel parts and zinc alloy die-casting parts that can improve the bonding force of the coating. Monovalent copper pre-impregnated copper method

Method used

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  • Cyanide-free monovalent copper presoaking method of steel and iron parts and zinc alloy die castings
  • Cyanide-free monovalent copper presoaking method of steel and iron parts and zinc alloy die castings

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specific Embodiment approach 1

[0014] Specific embodiment one: the iron and steel parts of the present embodiment and the zinc alloy die-casting part cyanide-free monovalent copper pre-impregnated copper method are carried out according to the following steps:

[0015] (1) Preparation of cyanide-free monovalent copper immersion plating solution: a. The concentration of monovalent copper compound is 2~40g / L, the concentration of antioxidant is 2~30g / L, and the concentration of non-cyanide main complexing agent is 10~130g / L, the concentration of auxiliary complexing agent is 5~60g / L, and the concentration of buffering agent is 5~40g / L. Weigh the monovalent copper compound, antioxidant, non-cyanide main complexing agent, auxiliary complexing agent b. the antioxidants taken by step a are dissolved in the hydrochloric acid solution of 60mL / L, then the non-cyanide main complexing agent and auxiliary complexing agent taken by step a are added, and under the condition of heating Stir until dissolved to prepare solu...

specific Embodiment approach 2

[0019] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the monovalent copper compound described in a and c of step (1) is one of cuprous oxide, cuprous chloride or cuprous bromide , the concentration is 3~35g / L. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the stabilizer described in a and b of step (1) is hydroquinone, pyrocatechol, resorcinol, sub- One or a combination of sodium phosphate, uric acid or ascorbic acid, the concentration is 3~25g / L. Others are the same as in the first or second embodiment.

[0021] When the stabilizer of this embodiment is a composition, various stabilizers are combined in arbitrary ratios.

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Abstract

The invention discloses a cyanide-free monovalent copper presoaking method of steel and iron parts and zinc alloy die castings and relates to a surface modification method for performing copper dip-plating on the surfaces of the steel and iron parts and the zinc alloy die castings by adopting cyanide-free monovalent copper dip-plating liquid. Cyanide copper plating adopted during copper electroplating of the surfaces of the steel and iron parts and the zinc alloy die castings at present is replaced. The method comprises the following steps: (1) preparing the monovalent copper dip-plating liquid by using a monovalent copper compound, an antioxidant, a non-cyanogen main complexing agent, an auxiliary complexing agent and a buffer agent; (2) preprocessing the steel and iron parts and the zinc alloy die castings; and (3) performing cyanide-free monovalent copper presoaking on the steel and iron parts and the zinc alloy die castings. The surfaces of the steel and iron parts and the zinc alloy die castings can be dip-plated with copper plating layers with good adhesion and dense crystals through the method, the plating layers are thickened by adopting cyanide-free alkali copper, the copper plating layers with excellent adhesion can be obtained, and cyanide-free environment-friendly surface modification of the steel and iron parts and the zinc alloy die castings is facilitated.

Description

technical field [0001] The invention belongs to the field of surface treatment of iron and steel parts and zinc alloy die castings, and relates to a surface modification method for iron and steel parts and zinc alloy die castings using cyanide-free monovalent copper preimpregnated copper. Background technique [0002] Copper plating is used as the bottom layer for surface modification of steel parts and zinc alloy die-casting parts to prepare a copper-nickel-chromium composite coating, which can obtain a bright and corrosion-resistant effect, which is not only beneficial to the appearance of the workpiece but also prolongs the service life of the workpiece. Therefore, electroplating copper-nickel-chromium combined coating has become an important means of surface modification of steel parts and zinc alloy die castings, and is widely used in industrial production. However, since iron and steel parts and zinc alloy die-casting parts are relatively active substrates, it is easy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/34C25D5/36C23C18/38
Inventor 田栋周长利郑香丽夏方诠刘姗花小霞
Owner UNIV OF JINAN
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