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Electroplating technology of basic principles
Dec 06, 2016

Is an electro-plating process is also a redox process. the basic process of electroplating is soak parts in a solution of metal salts as the cathode, and sheet metal as an anode, DC power supply, in the spare parts required to be deposited on the deposit.

For example: when nickel, the cathode to be plated parts, pure nickel anode plate,cathode and anode, respectively to the following reaction:

Cathode (plating): Ni2++2e → Ni (reaction)

2H++2e → H2 ↑ (side effects)

Anodes (nickel plate): Ni-2e → Ni2+ (response)

4OH--4e → 2H2O+O2 (side effects)

Not all metal ions from aqueous solution deposition, if hydrogen ions of hydrogen on the cathode side dominated, precipitation on the metal ions to the cathode.According to the experiment, possibility of electrodeposition of metal ions from aqueous solution, certain rules can be obtained from an element in the periodic table, as shown in table 1.1.

Anode is divided into soluble anode and not dissolved sex anode, most Yang is and coating phase corresponds to of soluble anode, as: plating zinc for zinc anode, silver for silver anode, plating tin-lead alloy using tin-lead alloy anode. but minority plating due to anode dissolved difficult, using not dissolved sex anode, as acid gilded using of is more for Platinum or titanium anode. plating liquid main salt ion by added preparation good of standard containing gold solution to added. plating chrome anode using pure lead, lead-tin alloy, lead-antimony alloy, not dissolved sex anode.