Zinc is a sacrificial coating used to prevent corrosion of the parent metal (usually steel). The corrosion resistance of zinc is very comparable to cadmium. With the use of chromates and sealers, the corrosion resistance can be increased.

Zinc has other applications such as:

• Improving the aesthetic value of the part
• Lubricity
• Combined with chromate or phosphate, makes a good paint base
• Combined with chromates and dyes can be used for identification purposes

Zinc plating baths in use at Hohman Plating:

• Cyanide Zinc (barrel method)
• Acid Zinc (rack and barrel method)

Post-plating chromates provided are:

• Gold
• Clear (Hohman uses trivalent chromate and is RoHS compliant)
• Black
• Olive Drab

Post-plating dyes provided are:

• Red
• Blue
• Green

Specifications:

• ASTM-B633
• AMS 2402
• MIL-STD-171 1.9.2