Adhesive Wear Properties of Electrodeposited Coatings for Sliding Contacts

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Abstract
Electrodeposited coatings of gold, various gold alloys, palladium, tin and tin/lead alloys have been investigated in terms of wear. A commercial plug and socket connector was employed as the test vehicle. Pure gold, gold/silver alloys, certain palladium deposits, tin and tin/lead are prone to adhesive wear, caused by cold pressure welding. Gold exhibits improved wear properties if a polymeric material is co-deposited. ‘Hard’ palladium from a ‘p’ type electrolyte is more wear resistant than the softer bromide deposits, and finally certain metallic additions to gold reduce its susceptibility to cold welding. In the paper various mechanisms are proposed by which adhesive wear may be reduced. The effect of atomic size and lattice structure of alloying elements and the way in which they influence the tendency to cold weld (and hence promote adhesive wear) are discussed.

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