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Blue zinc plating

1. Here I would like to get your opinion regarding to the blue zinc plating, become a rainbow mark on surface.
2. Is this a normal condition after through the treatment process ?
3. Any explanation to say this is acceptance case doing the zinc plating ?

Munir Amil
Automation industry - Penang, Malaysia
2007

I would say that this question involves an appearance standard -- which is a matter of whether the piece falls within or outside of the aesthetic range of standard samples agreed upon -- rather than compliance with a specification. The rainbow is probably a diffraction pattern due to the thickness of the conversion layer, rather than an actual discoloration. Contrary opinions welcome.

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
2007

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