Electroplating equipment Fundamentals

The product research and development, design scheme, production and manufacturing, marketing and service projects of electroplating equipment and ultrasonic cleaning equipment are integrated. Electroplating is a whole process of photocatalysis, as well as a whole process of redox reaction. The basic whole process of electroplating is to immerse the parts in the solution of metal salt as the cathode, and the metal sheet as the anode. After being connected to the DC stabilized power supply, Deposit the required coating on the part.

For example, during nickel plating, the cathode is the part to be plated and the anode is a pure nickel plate. The following reactions occur at the cathode and anode respectively:

Cathode (plating piece): 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 hydrogen ion reduction to hydrogen on the cathode plays a key role, metal ions cannot be precipitated on the cathode. According to the test, the probability of metal ions electrodepositing from the aqueous solution can obtain certain regularity from the table of chemical elements, as shown in Table 1.1.

Anodes are divided into soluble anodes and insoluble anodes. Most of the anodes are soluble anodes corresponding to the coating, such as zinc anode for hot galvanizing, silver anode for gold plating, and tin lead alloy anode for tin lead alloy plating. However, a few electroplating uses insoluble anodes because of difficult anode melting, For example, platinum or titanium anodes are commonly used for acid gold plating. The positive ions of the main salt of the plating solution are filled by adding the configured solution with standard content. Pure lead, lead tin alloy, lead antimony alloy and other insoluble anodes are used for chromium plating.