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"Stripping Tin / tinplate from Steel"



2005

Q. Hi: I'm working with a flat steel piece about half inch wide and 8.5 inches long and 1/16 thick. I'm plating this with a bright acid tin solution. I'm experiencing some reject because of excess of the tin thickness. My main problem is that I have not found any formulation for stripping tin over steel.
Do you have any formulation for this?
Thanks in advance.

Reynaldo Martinez
Plating Shop - Monterrey, Mexico
^


2005

A. Sodium m-nitro benzene sulfonate (aka "Strip-aid") 8 oz/gal plus NaOH 4 oz/gal, immersion at room temp.

jeffrey holmes
Jeffrey Holmes, CEF
Spartanburg, South Carolina
^


2005

A. Proprietary hot oxidizing alkaline strippers are available from many suppliers such as Macdermid, Enthone

Geoffrey Whitelaw
Geoffrey Whitelaw
- Port Melbourne, Australia
^


2005

A. The simplest way to strip tin from steel is to use 80 g/l sodium hydroxide at about 85 °C. This is the way tin is commercially stripped from tinplate. Tin is an amphoteric metal and will dissolve in acid and alkali, but steel doesn't react with alkali, so you will have no problems here. If you want to strip it back to the steel and it has been heat treated, there will be an intermetallic layer. This is very difficult to disrupt but can be done with applying an electric current.

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
^


August 28, 2012

Q. I tried NaOH 80 gm/l solution at 85 degrees; no reaction. Can you please help.

aditya_kochar
Aditya Kochar
electroplating business - Jaipur, Rajasthan, India
^


August 30, 2012

A. Try adding about 8 g/litre sodium nitrite to 80 g/l sodium hydroxide at 85 °C

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
^

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