Letter 3053

Tarnish on silver plating of electronical components 

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Hello everybody : I want to ask if somebody knows about a tarnish cleaner on silver plating of electronical components whih I can recover a finish withaout tarnish . I know about some chemical procceses to recover the finishes of silver plating componentes but I ned some help about if there is an other spray product or procceses whith I can attempt to recover some electronical components with tarnish problems in its finishes. I hope sombody can help me Best Regards

Eduardo Herrera Delgado
- Estado de MÈxico , Mexico

Dear Eduardo, Are the components still in bulk, or are they attached to an assembly? Did they tarnish in a bag, or in service? Regards, tom

Tom Pullizzi platronica.com Falls Township, PA

 

As a side issue to this topic.

Does anyone know what the electrical resistivity is of Silver Tarnish (Silver Sulfide)? We have silver plated over a nickel underplate all over a copper base metal and the silver does tarnish over time. These are electrical parts and the contact resistance can be a problem if it is too high. The ASTM spec (B700) just mentions that the resistance is high, but does not provide any more detail.

As far as I know the only way to remove the tarnish is either with abrasive or chemically. And both will remove some amount of the silver.

Thanks

Peter Stern Mechanical Design Engineer
- Burnaby, BC, Canada

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