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Removal of tin coating from steel back

Dear all,
I want to remove the tin coating from the steel back without sacrificing its surface roughness. is there any method ,currently we remove it by brushing with 30 SWG grade wire brushing ,we also employe cloth flapwheel, but result never come satisfactorily, kindly suggest any method by which I can overcome this problem. presently I achieve surface roughness of 0.6-1 Ra, whereas steel roughness before processing is 0.3 Ra.

Mech Mohan
autos - Pune, India
December 17, 2009

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December 17, 2009

Hi, Mech. I have no idea of the size or shape or function of these parts or how the tin gets onto them in the first place. It's probably obvious to you, but as a reader I have no feel yet for what your situation is.

Regards,

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

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March 1, 2012

We produce continuous babbit strips. For doing this, steel strips goes through different process, ie. degreasing, linishing, fluxing, neutralizing, Tinning and babbit pouring on to steel surface.

As a process requirement we require babbiting only at one side of steel strip, other side should be free from any coating, including traces of tin. Strips after tinning bath sticks at the back of steel back, for which we require additional operation of steel wire brushing to remove those tin marks.

We wish to avoid that attraction of tin onto steel back. What process or chemical can we use to get a clean tin-free steel back. Kindly suggest .

Mech Mohan
- Pune, MH, India

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You could mask the back prior to plating with tape or paint. If you are doing this plating as a continuous process, like reel-to-reel, it would be simple to add masking in-line.

Jeffrey Holmes, CEF
Spartanburg, South Carolina
April 2, 2012