Resistance of Zinc Plating Colors

The color of Zinc plating comes from the passivation layer on top of zinc layer. Zinc itself is bright white metal color.

Below is a table to look at coorsion resistance of different colors of  passivation layer.

 Passivation thickness in nm Corrosion Resistance hours NSS

Blue(Cr3+)

25-80 8-72

Iridescent(Cr3+)

250-3500 72-120

Blue (Cr6+)

25-80 8-24

Yellow(Cr6+)

250-500 72-96

Oliv(Cr6+)

1000-1500 300

Black(Cr6+)

250-1000 150-300

***This is a general reference table, please check with your plating supplier for precise consultation.