- Aug 15, 2018 -
The electroplating process generally includes pre-plating pretreatment, electroplating, and post-plating treatment.
1. Pre-plating pre-treatment: The purpose of pre-plating pre-treatment is to obtain a clean and fresh metal surface in preparation for the final high-quality coating. The first step: surface roughness meets certain requirements, achieved by polishing and polishing; the second part: degreasing and degreasing, using volumetric dissolution and chemical and electrochemical methods; the third step: derusting, mechanical and pickling can be used. Electrochemical method for derusting; the fourth step: activation treatment, generally in a weak acid for a certain period of time to carry out pre-plating activation treatment.
Second, post-plating treatment: 1. Passivation treatment refers to the surface treatment method of chemical treatment in a certain solution to form a solid dense and high stability film on the coating. Passivation greatly improves the corrosion resistance of the coating and increases the surface gloss and pollution resistance. This method is very versatile and can be passivated after plating with An, Cu and Ag. 2. In addition to hydrogen treatment, some metals such as zinc, in the electrodeposition process, in addition to their own deposition, will also precipitate a part of hydrogen, this part of hydrogen infiltrated into the coating, so that the plated parts become brittle, or even broken, become hydrogen embrittlement. In order to eliminate hydrogen embrittlement, the plated parts are often heat treated at a certain temperature for several hours after electroplating to become hydrogen treatment.