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topic 9656

Greyish white deposit on tin plating


I am using a tin acid bath with 120cc/L of sulphuric acid for plating of small steel terminals. I get a bright finish on the outside using a voltage of 4-6 volts but the internal surface seems to be dull in places with a whitish gray deposit. If I scratch it off I find that the residue is covering a bright tin layer. Is there any way to remedy this problem? I am using a rack plating method.

Nadeem Akhter
Sanemca - Lahore, Pakistan


Sounds like a brightener film which you might remove by a post dip in the alkaline cleaner.

pooky tom pullizi signature
Tom Pullizzi
Falls Township, Pennsylvania

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