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Hexavalent chromium-free surface treatment method and hexavalent chromium-free lead-containing copper-based metal material
Hexavalent chromium-free surface treatment method and hexavalent chromium-free lead-containing copper-based metal material
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机译：六价无铬表面处理方法及六价无铬含铅铜基金属材料
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摘要
In the product the material of lead-containing metal, it is possible to reliably prevent elution of lead market after and set to zero the amount of elution of hexavalent chromium, and to reliably prevent discoloration and to improve the corrosion resistance of the surface to. And chromic acid treatment step was treated with chromic acid the surface of the lead-containing metal material, eluted removal of lead in the surface part, by reducing aqueous solution containing chromic acid for reducing agent, hexavalent chromium-free surface treatment method, the chromium and hexavalent chromium removal process to completely remove hexavalent chromium as a film component, which is formed on the surface of the lead-containing metal material in the acid treatment step, modify the surface of the lead-containing metal material was removed hexavalent chromium I and a surface modification process that. This method of treatment was carried out a variety of surface treatments that use plastics and various metals of lead-containing metal material other than nickel chromium (various resin) material industrial and chromium (NiCr) or plating (Cr) plating, hexavalent chromium It can be applied to various applications of products made from the material.
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