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Stripping Tin over Steel
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.
Plating Shop - Monterrey, Mexico
First of two simultaneous responses -- +++++
Sodium m-nitro benzene sulfonate (aka "Strip-aid") 8 oz/gal plus NaOH 4 oz/gal, immersion at room temp.
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Jeffrey Holmes, CEF - Spartanburg, South Carolina |
Second of two simultaneous responses -- +++++
Proprietary hot oxidizing alkaline strippers are available from many suppliers such as MacDermid, Enthone
Geoff Whitelaw
- Port Melbourne, Victoria, Australia
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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.
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Trevor Crichton R&D practical scientist The Pheasantries - Chesham, U.K. |