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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
finishing.com - Pine Beach, New Jersey
2007

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