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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Copper "Red Plague" CorrosionCopper "Red Plague" Corrosion
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1/9/2003 9:00 AM
 
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I recently read that when silver is plated over copper there can be an accelerated corrosion of the copper, through galvanic action, at pinholes or breaks in the silver plating. It is then susceptible to the formation of cuprous oxide when stored or used in a moist or high humidity environment. This corrosion is known as "red plague" and is identifiable by the presence of a brown-red powder deposit on the exposed copper. Is there another way of coating copper other than plating so that this corrision will not occur?
 
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1/10/2003 9:00 AM
 
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John: Silver is cathodic to copper in an aqueous corrosion cell. If the Silver coating has breaks in it, allowing a corrosive media to contact the copper, the resulting corrosion cell is a small area anode (Copper) and a large area cathode (Silver). Under those condition, the copper may experience accelerated corrosion and form cuprous oxide. Two potential solutions are: (1) plate the Silver sufficiently thick to provide a continuous coating and, (2) plate with an anodic coating, i.e., nickel. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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