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Japan February 2, 2005
OM Industrial Co., Ltd. of Japan successfully developed trivalent chromium electroplating technology for magnesium alloys, and exhibited the structural components of mobile phones using this technology at the "34th International Exhibition and Seminar on Electronic Packaging and Products in Japan (2005 1 to 2 1 held in Tokyo BigSight International Convention and Exhibition Center)". The purpose is to replace hexavalent chromium electroplating. The structural components of mobile phones can be put into production immediately (OM industry).
It is reported that the company has obtained the patent of trivalent chromium electroplating technology for magnesium alloys. Trivalent chromium electroplating and hexavalent chromium electroplating are surface treatment technologies that can effectively prevent magnesium alloys, aluminum alloys and zinc plating from rusting. In the past, hexavalent chromium electroplating was widely used, but in view of RoHS law in the field of household appliances and ELV and other environmental protection regulations in the field of automobiles in Europe, hexavalent chromium electroplating must be completely abolished. Trivalent chromium electroplating, as a technology that can meet this requirement, has been widely concerned by the industry. But for trivalent chromium, if the wastewater is not treated and managed well, it may become hexavalent chromium, so it is best to realize chromium-free treatment in the future.
Method for electroplate magnesium and magnesium alloy
A method for electroplating magnesium and magnesium alloy.
Publication (announcement)No. CN 1699634
Release date (announcement) 2005+0438+0.23
Application (patent)No. CN2005 10046235.5
Applicant (patent right): Shenyang University of Technology.
Inventor (designer) Li; Zheng Liu; Ge yiyin; Li Lin
An electroplating method of magnesium and its alloy includes dehydrogenation, chemical degreasing, luminescence, neutralization, activation, pre-plating, functional plating, decorative plating and post-treatment, and the casting needs to be washed with water between every two processes. The pre-plating current density is 5 ~ 15A/dm2, the cell voltage is 4 ~ 12V, the pH value of the pre-plating solution is 1.0 ~ 1.2, and the room temperature Baume is 30 ~ 35. The formula of pre-plating solution contains copper fluoborate, fluoboric acid, aminopropionic acid, polyethylene glycol and so on. The pre-plating solution of the invention does not contain cyanide, and is non-toxic and harmless; The pre-plating layer has good adhesion to the substrate, and at the same time, it has good adhesion to the continuous plating functional coating and decorative coating; The coating has good corrosion resistance and wear resistance. The coating is bright and the decorative effect is good.
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Basic principle-chromium plating