plating, anodizing, & finishing Q&As since 1989
Tarnish on silver plating of electronic components
Hello everybody : I want to ask if somebody knows about a tarnish cleaner on silver plating of electronic components which I can recover a finish without tarnish . I know about some chemical processes to recover the finishes of silver plating components but I ned some help about if there is an other spray product or processes which I can attempt to recover some electronic components with tarnish problems in its finishes. I hope somebody can help me Best RegardsEduardo 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
Falls Township, Pennsylvania
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. ASTM B700 [affil link] 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.
ThanksPeter SternMechanical Design Engineer
- Burnaby, BC, Canada
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