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How to plate Nickel on top of Tin plate ?

2000

I'm plating manager for a job-shop and we are processing lampholders or caps for electrical bulbs. These have to be brass plated and the most important area in the inside of the cap. We usually don¥t have problems, but lately the parts are being received with bright TIN on the inside of tha cap, (I imagine they buy tin plated one one side,sheets of steel to fabricate the parts) and we can't plate nickel on top of the Tin deposit, and we haven't found a good way to remove the tin plate without attacking the bare steel. Also we need to provide a bright finish on the inside, if we use to much acid the steel becomes dull when we strip the tin. Could we use the bright Tin as a base to obtain better brightness ? How can we prepare these parts for barrel Nickel and Brass plate ?

Thank you in advance

Enrique.

Enrique Segovia
- Monterrey, Mexico

Please someone try to help me on this subject.

Thank you,

Enrique.

Enrique Segovia
- Monterrey, Mexico
2000

2000

No recomiendo niquelar piezas estaniadas , pues es muy probable que se presenten blisters al calentarse.

La mejor solucion es deplacar las piezas en una solucion en base a cianuro y luego niquelar .

Deplaques cianurados par niquel generalmente renueven el estanio facilmente sin perjudicar al metal base.

Esposible niquelar piezas estaniadas con un stricke de cobre como pretratamiento.

Gabriel Schonwald
Bnei Berak, Israel

Gabriel Schonwald,

Gracias por sus comentarios.

Hemos hecho lo que recommendo y funciona, pero tengo informacion que anteriormente si podiamos niquelar sobre estaÒo, con muy buenos resultados. No blisters y muy buen brillo.

Gracias otra vez y Shalom !

Feliz Pesaj

Enrique Segovia
- Monterrey, Mexico
2000

Amigo frustrado: Espero hayas solucionado tu problema y no te puedo ayudar. No obstante yo tengo muchos problemas para que me niquelen piezas de bronce pequeÒas. Como se hace? Recuerdo haber cobrizado con un cargador de baterÌas y sulfato de cobre. Como se compra el Niquel? y que electrolÌto se usa? Quizas hay alguien por ahÌ que sabe como y le agradecerÌa infinitamente su ayuda. Cordiales saludos Richard

Richard Greswell
- Santiago, Chile
2002

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