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Zinc plating with Black Passivation defects
January 24, 2013
Q. I have an issue with Carbon Steel Gauge plates that have been Zinc and Black passivated to 14 um, approx 7-10% of the plates have a white mouldy deposit over the surface.
These have undergone a 1 month sea voyage.
Please advise on what could have caused this, and how to prevent in further batches.
I would suppose the only way to rectify these plates is strip and recoat?
Please see attached Picture.
- Beijing, China
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