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Cyanide-free monovalent copper preimpregnation method for iron and steel parts or zinc alloy die-casting parts

A zinc alloy and die-casting technology, applied in metal material coating process, liquid chemical plating, coating and other directions, can solve the problems of poor copper coating adhesion, improve the adhesion of the coating, reduce the concentration, and reduce the discharge potential. Effect

Inactive Publication Date: 2017-01-04
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 steel parts or zinc alloy die-casting parts, and provides a cyanide-free coating for steel parts or 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 preimpregnation method for iron and steel parts or zinc alloy die-casting parts
  • Cyanide-free monovalent copper preimpregnation method for iron and steel parts or zinc alloy die-casting parts

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specific Embodiment approach 1

[0014] Specific implementation mode one: the iron and steel parts or zinc alloy die-casting parts of the present embodiment method is 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 solution A; c. Slowly add the monovalent copper compou...

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 antioxidant described in step (1) a and b 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 antioxidant of this embodiment is a composition, various antioxidants are combined in arbitrary ratios.

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Abstract

A method for pre-impregnating copper with cyanide-free monovalent copper for iron and steel parts or zinc alloy die-casting parts. The invention is intended to replace the cyanide copper plating that must be used in the electroplating of copper on the surface of steel parts or zinc alloy die castings. Cyanide-free monovalent copper pre-impregnation methods for iron and steel parts or zinc alloy die castings include: (1) Prepare monovalent copper immersion plating with monovalent copper compounds, antioxidants, non-cyanide main complexing agents, auxiliary complexing agents and buffers (2) Pretreatment of steel or zinc alloy die castings; (3) Cyanide-free monovalent copper preimpregnation of steel or zinc alloy die castings. Iron and steel parts or zinc alloy die castings can be dip-coated with a layer of copper coating with good adhesion and crystallization on the surface through the method of cyanide-free monovalent copper pre-impregnation copper, and then use cyanide-free alkali copper to thicken the coating to obtain excellent adhesion. Copper plating is beneficial to the cyanide-free environmental protection of steel parts or zinc alloy die-casting surface modification.

Description

technical field [0001] The invention belongs to the field of surface treatment of steel parts or zinc alloy die-casting parts, and relates to a surface modification method for steel parts or zinc alloy die-casting parts using cyanide-free monovalent copper pre-impregnated copper. Background technique [0002] Copper plating is used as the bottom layer for surface modification of steel parts or zinc alloy die castings to prepare a copper-nickel-chromium composite coating, which can obtain bright and corrosion-resistant effects, 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 or zinc alloy die castings, and is widely used in industrial production. However, since steel parts or zinc alloy die-casting parts are relatively active substrates, it is easy to replace the loose copper...

Claims

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Application Information

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Patent Type & Authority Patents(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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