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How do I check for Rust on a galvanized sheet?

Sorry, If my question sounds too amateurish. I had checked 4 galvanized sheets with Silver Nitrate test and to my amazement on 2 sheets Silver chlorides were found. My question is How can 2 out of 4 galvanized sheets have chloride deposits on them?.
Secondly, How can I check the presence of Chrome plating on a galvanized sheet of size 2 mm.

Santosh Kumar
Employee - India
August 16, 2011

Hi, Santosh.

Galvanized sheets would virtually never be chrome plated. Maybe you are referring to a chromate conversion coating or chromate-bearing final rinse?

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
August 17, 2011

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