As an Amazon Associate & eBay Partner: we earn from qualifying purchases
Mr. Rogers: "Look for the Helpers. You'll always find people who are helping."

finishing.com -- The Home Page of the Finishing Industry

-----

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
(Ted can offer longterm or instant help)
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
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

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: