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ASTM-B633, Zinc Either a bright or dull finish is acceptable. Bright zinc plating closely resembles bright chromium. However, bright zinc does not have the
permanence of surface appearance. Zinc coated steel will not rust even when exposed by scratches because of the galvanic protection of the zinc. On weathering, zinc turns
to a drab gray color. Zinc should be deposited directly on the base metal (Nickel is permissible undercoat if base metal is a corrosion resisting steel).
The primary use of chromate finishes on zinc is to retard or prevent formation of white corrosion products on zinc surfaces. The primary
purpose of phosphate coating on zinc is to provide a paint base.
Type I Without supplementary treatment.
Type II With supplementary chromate treatment.
Type III With supplementary colorless chromate treatment.
Type IV With phosphate conversion treatment.
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