The research and development, design, manufacturing, sales and service of electroplating equipment and ultrasonic cleaning equipment are integrated. Electroplating is an electrochemical process and a redox process. The basic process of electroplating is to immerse parts in a metal salt solution as a cathode , The metal plate is used as the anode, after connecting the DC power supply, the required plating layer is deposited on the part.
For example: when nickel plating, the cathode is the part to be plated, and the anode is pure nickel plate. The following reactions occur in the cathode and anode respectively:
Cathode (plating parts): Ni2++2e→Ni (main reaction)
2H++2e→H2↑ (side reaction)
Anode (nickel plate): Ni -2e→Ni2+ (main reaction)
4OH--4e→2H2O+O2+4e (side reaction)
Not all metal ions can be deposited from the aqueous solution. If the side reaction of the reduction of hydrogen ions to hydrogen on the cathode is dominant, it is difficult for the metal ions to precipitate on the cathode. According to the experiment, the possibility of electrodeposition of metal ions from the aqueous solution , A certain rule can be obtained from the periodic table, as shown in Table 1.1.
Anodes are divided into soluble anodes and insoluble anodes. Most anodes are soluble anodes corresponding to the coating, such as zinc anode for zinc plating, silver anode for silver plating, tin-lead alloy anode for tin-lead alloy plating. But a few electroplating Because the anode is difficult to dissolve, insoluble anodes are used. For example, acid gold plating uses platinum or titanium anodes. The main salt ions of the plating solution are supplemented by adding a prepared standard gold-containing solution. The chromium plating anode uses pure lead, lead-tin alloy, Lead-antimony alloy and other insoluble anodes.
