Black chromate plating Process Surface coating process where the workpiece through an anode-cathode reaction is coated with a thin decorative layer of hexavalent chrome with a black tone.
Hexavalent hard chromium Process Surface coating process where the workpiece through an anode-cathode reaction is coated with hexavalent chromium.
Trivalent bright chromium Process Surface coating process where the workpiece through an anode-cathode reaction is coated with a thin decorative layer of trivalent chromium.