Working principle of electroplating

The working principle of electroplating is that electroplating needs a low-voltage and high-current electroplating bath power supply and an electrolytic device consisting of electroplating solution, plated parts (cathode) and anode. The composition of electroplating solution varies according to different plating layers, and they all contain a main salt for providing metal ions, a complexing agent for complexing the metal ions in the main salt to form a complex, and a buffer for stabilizing the pH of the solution.

Electroplating is a process in which metal ions in plating solution are reduced to metal atoms by electrode reaction under the action of external electric field, and metal deposition is carried out on the cathode. Therefore, this is a metal electrodeposition process including liquid phase mass transfer, electrochemical reaction and electrocrystallization.

Extended data:

The role of electroplating:

1, copper plating: used as primer to improve the adhesion and corrosion resistance of electroplated layer. (Copper is easily oxidized. After oxidation, patina is no longer conductive, so copper-plated products must be protected with copper. )

2. Nickel plating: used as primer or appearance to improve corrosion resistance and wear resistance (the wear resistance of chemical nickel exceeds that of chromium plating in modern technology).

3. Gold plating: improve conductive contact impedance and enhance signal transmission.

4. Pd-Ni plating: improve the conductive contact impedance and enhance the signal transmission, and the wear resistance is higher than that of gold.

5. Tin-lead plating: to improve the welding ability, it will soon be replaced by other substitutes (because of lead, most of them are now plated with bright tin and foggy tin).

6. Silver plating: improve conductive contact impedance and enhance signal transmission. Silver has the best performance, is easy to oxidize and conducts electricity after oxidation. )

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