The hard chromium electroplating coating is bright and fine, and firmly combined with the substrate. The hardness of the coating can be as high as HV11. The amount of non-corrosive anode is small: the maximum ratio can reach 8:1. Cathode current efficiency is 22~27%, deposition speed is fast, and electric energy is saved. The coating is smooth, uniform in thickness and strong in dispersion. Stable process, simple maintenance, easy operation and direct conversion. Does not contain fluoride and does not corrode the workpiece substrate in the low current density area of the cathode. The number of micro-cracks in hard chromium electroplating coating is more than 4/cm, which has high corrosion resistance. Hard chromium electroplating can improve the surface brightness and hardness of the mold, making its surface smooth and bright, corrosion-resistant, high temperature resistant, wear-resistant, rust-resistant, easy to demould, and non-stick to the mold. The mold treated by our company can resist high temperature of 6-8 degrees Celsius and reach 6-65HRC (hardness) smoothness. It is not easy to be damaged, broken and chromed under normal maintenance and use. Thereby prolonging the service life, improving the quality, reducing the material cost and improving the production efficiency. In addition, it can be plated with smooth surface and matt surface. Hard chromium electroplating ensures the improvement of the surface hardness and brightness of the mold, greatly improves the rust-proof ability, corrosion resistance and wear resistance of the mold, has the improvement of the surface hardness and brightness, has the durable value of a set of treated molds, and has the added value of the appearance of plastic products 3-4 times that of untreated molds.