It is an electrolytic process where a zinc layer is bonded to a metal piece to enhance corrosion resistance and improve cosmetic appearance with various colors.
ASTM B633
TYPE II
Thickness: 8 to 12 microns, can reach up to 30 microns
Color: Clear, Blue, Yellow, Black
In this process, steel materials are coated with a thin layer of zinc electrolytically at room temperature, giving the piece a shiny finish.