All aluminum alloys, but do not use where solution can be entrapped. Type I Electrodeposited. Either a satin or bright luster is acceptable. Has excellent solderability. No undercoating required on steel substrates unless otherwise specified.
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. 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.