Zinc phosphating

摘要

The phosphating of steel, galvanized steel, zinc, and sometimes aluminum represents an essential stage in many areas of surface finishing. It is employed for the purpose of pretreatment prior to painting, increasing corrosion protection, assisting cold forming, and improving the sliding friction properties of components in sliding contact. Each of these areas will be covered with application examples. Zinc phosphate is a crystalline conversion coating that is formed on a metal substrate Utilizing the chemical reaction between metal ions that have been dissolved in mineral acids And then diluted with water to form the process solution.