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topic 59135

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.

white deposit on passivated steel  white deposit on passivated steel 2

Christopher Kay
- Beijing, China

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