Zinc single dip trivalent chromate coatings include (all ROHS compliant): Clear Black Yellow Olive Drab Red, Blue, & Green Dyes Call for special colors
Zinc coatings prevent oxidation of the protected metal by forming a barrier
and by acting as a sacrificial anode if this barrier is damaged. Zinc oxide is
a fine white dust that (in contrast to iron oxide) does not cause a breakdown
of the substrate's surface integrity as it is formed. Indeed the zinc oxide, if
undisturbed, can act as a barrier to further oxidation, in a way similar to the
protection afforded to aluminum and stainless steels by their oxide layers. The
majority of hardware parts are zinc plated.