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topic 11231

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, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


 

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
Khozem Vahaanwala
Saify Ind supporting advertiser
Bangalore, Karnataka, India

saify logo


 

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

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



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