Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 storey density multilayer professional supplier, Shenzhen gold-plated circuit boards, to provide customers with high-precision, high-quality circuit board in Shenzhen, gold-plated circuit board advantage, quality assurance, purchasing gold-plated circuit board, at reasonable prices. When the tank wall and bottom sediments appear gray and black, you need to deal with nitrate groove. The procedure is as follows: Add 1: 1 nitric acid, the above start circulating pump 2 hours or until the groove wall gray-black deposits completely removed. Heating may be considered appropriate, but should not exceed 50 ℃, in order to avoid air pollution. In addition, some people think residue activated with a palladium ions in the washing process can cause hydrolysis, thus causing adsorption diffusion coating on a substrate, it should be washed after activation countercurrent, pay more sulfuric acid or hydrochloric acid after leaching and counter-current washing manufacturing process. Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 layer multilayer professional providers, to provide customers with high-precision, high Shenzhen circuit board quality, Guangdong gold-plated circuit boards, quality assurance, reasonable prices. The principle is that gold-plated nickel and gold (commonly known as the gold salt) dissolved in a chemical solution, the circuit board is immersed in the plating tank and pass on the current generation of nickel gold plating on copper surface of the circuit board, electroless nickel gold because high coating hardness, wear resistance, easy oxidation characteristics of electronic products were widely used. Gold-plated circuit board superiority, Newell Year (online consultation), Guangdong gold-plated circuit boards by the Department of Shenzhen-Electronic Technology Limited. Newell Shenzhen Electronic Technology Co., Ltd. (www.yipcb.com) (www.yipcb.com) Guangdong Shenzhen, printed circuit board leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Newell create leadership with the staff warmly welcome all inquiries negotiations to create Newell create a better future.