Electroplating: blue and white/colored zinc, trivalent blue and white/colored zinc, black zinc, zinc-nickel alloy, nickel plating, copper plating, gold plating, silver plating, green zinc plating, chromium plating, etc.
Electroless plating: dacromet, Jiumeite, mechanical zinc plating, hot dip galvanizing, blackening, phosphating, etc.
Each one needs a long explanation. Which one do you want?