In order to meet the black market, the extinction parts requirements, such as optical components, stealth components, connectors and other electronic products, some previously obtained by plating or black oxide, now need to use Dacromet embalmed, which will require Black Duck Luo coating solution. Use of the product while maintaining the original black exterior, but also improved the corrosion resistance. Currently, domestic black Dacromet two processes, one is on the basis of silver DACROMET, coated with a black paint, the principle is the use of silver-gray appearance (referred coated law ). Disadvantages of this method is spraying or dipping, could easily lead to uneven thickness, easy to sag or accumulation, NA sophisticated, decorative parts. The second method is a black liquid DACRO Japan, Germany, the United States adopted. The country has no spontaneous style dark gray or matt black DACRO fluid. The country has no spontaneous style black DACROMET related reports. Therefore, we developed a two-step implementation of the research project, the first step is treated method, using electrochemical methods, the film thickness is easy to control, no sagging, stacked, soft and delicate appearance. The second step is spontaneous, direct processing solution will DACRO black or dark gray liquid. Dacromet processing, environmental protection Dacromet processing, black Dacromet processing www.czrhdkl.top