Chromium-ion-free zinc-nickel alloy automatic electroplating process
A technology of zinc-nickel alloy and electroplating process, which is applied in the surface treatment and protection field of rubber-metal composite parts. It can solve the problems of poor anti-corrosion performance, failure to meet environmental protection requirements, and inability to use for a long time to achieve high production efficiency and excellent anti-corrosion effect. , the effect of good coating appearance
Inactive Publication Date: 2017-05-10
ZHUZHOU TIMES NEW MATERIALS TECH
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Problems solved by technology
[0004] The invention provides a zinc-nickel alloy automatic electroplating process without chromium ions, which can solve the following technical problems: the surface of the electroplating layer contains chromium ions after passivation, which cannot meet the environmental protection requirements; the electroplating layer is only electroplated without passivation treatment Poor anti-corrosion performance, can not be used for a long time
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[0019] The present invention will be further described below in conjunction with the accompanying drawings.
[0020] Such as figure 1 Shown, a kind of zinc-nickel automatic electroplating process without chromium ion comprises the following steps:
[0021] 1. Manual treatment: Scrub the rubber-metal composite parts or the residual adhesive and attachments on the metal surface with sandpaper and grindstone, and polish the slight burrs to make them smooth and thorn-free.
[0022] 2. Hanging: Select a special hanger according to the product structure to ensure good electrical conductivity of the electroplating part and not damage the rubber, metal and rubber-metal bonding parts.
[0023] 3. High-temperature degreasing: Use an alkaline degreasing agent (JASCO CA-130) with a concentration of 40-60 g / L to clean at 50-60°C for 3-5 minutes.
[0024] 4. Pickling: pickling in 300-500 g / L hydrochloric acid solution for 2-3 minutes.
[0025] 5. Electrolytic degreasing: Use an electroly...
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The invention discloses a chromium-ion-free zinc-nickel alloy automatic electroplating process. The chromium-ion-free zinc-nickel alloy automatic electroplating process comprises the following steps: pretreatment: removing oil stain and rust on the surface of a rubber-metal composite part or a metal part to be plated in such modes as pickling, electrolytic degreasing, and high-temperature degreasing; electroplating: utilizing electrochemical reaction to enable two metal ions (zinc and nickel) to be co-deposited on the metal surface to form a plating; confining: enabling a confining liquid to infiltrate the gap of the plating to form an organic or inorganic protective layer on the surface of the plating, wherein the confining temperature is 50-80 S, and the temperature of the confining liquid is 40-50 DEG C; blow-drying; drying; and packaging. By adoption of the chromium-ion-free zinc-nickel alloy automatic electroplating process, as the surface of the electroplating does not contain chromium ions, the requirement for environmental protection is satisfied; after electroplating, passivation is not needed, the anti-corrosion performance is good, long-time use can be realized, and the chromium-ion-free zinc-nickel alloy automatic electroplating process can guarantee favorable appearance of the plating; as passivation is not needed, the operation is simple, additional treatment is not required and the production efficiency is high; and the obtained plating has no red rust under neutral salt spray for 1,000 h.
Description
technical field [0001] The invention relates to the technical field of surface treatment and protection of rubber-metal composite parts. Background technique [0002] With the rapid development of rail transit and modern industry, the preparation level of elastic elements has been improved, and the requirements for anti-corrosion technology of elastic elements have also been increased. Most elastic elements use electroplating process for surface treatment, and passivation is used One process can significantly improve the corrosion resistance of the elastic element. Passivation is divided into hexavalent chromium passivation or trivalent chromium passivation. Because hexavalent chromium is toxic and has persistent hazards to the environment, it is usually used in areas with environmental protection requirements. The treatment process of trivalent chromium passivation is adopted, but the coating still contains chromium ions. However, developed countries in Europe and other pl...
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Login to View More IPC IPC(8): C25D3/56C25D5/54C25D5/48
CPCC25D3/56C25D5/48C25D5/54
Inventor 李斌王林周同理邓建青董亚东谢彦飞冯万盛
Owner ZHUZHOU TIMES NEW MATERIALS TECH