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Letter 2054
Zinc Plating - Advantages of different
finishes.
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Can you advise if the yellow / gold finish that zinc plated work
is sometimes finished with,has any advantages or disadvantages for
steel that is later powder coated. We normally specify the
matte/satin chrome looking finish. I have been told the gold finish
improves corrosion resistance, but cannot take the heat of powder
coat preheating and also tends to absorb moisture which would in turn
detract from corrosion performance??
john Bransby
March 7, 2009
I don't believe yellow chromate on zinc will have any specific
advantage in your application. It will not handle more than 58
Degrees C, and will behave the same as the clear chromate. Some of
our customers who zinc plate before powder coating specify No
passivation (chromate).
Scott Howard
- Johannesburg, South Africa
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