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INORGANIC FINISHING PROCESSES

What are all the reasons for the rust problem with in a month after the plating process.(Zinc plating with yellow passivation in the sheet metal).

L.Subramani
SPEAKER MFG - Chennai, Tamilnadu, India

I don't fully pretend this is "all the reasons", but the parts not being dried is one, and storing the parts in close proximity to a plating operation (where acid vapors are in the air) is another.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
(Ted is available for instant or longterm help)

Porosity in the base metal is the fifth, and using pickled HR sheet assuming it is bright CRCA is the sixth. I presume you have checked the plating adhesion and thickness, right?

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

Seventh could be storage after finishing - high humidity, organic vapours - from wooden packing to name a few problems.

Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England

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