Sliding element and process for producing the same
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United States of America Patent
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Jan 27, 1998
Grant Date -
N/A
app pub date -
Jul 27, 1995
filing date -
Nov 27, 1992
priority date (Note) -
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Abstract
A sliding element has a bearing metallic layer made of aluminum or an aluminum alloy which bears on its side facing the sliding surface a galvanically produced tin layer bonded to the bearing metallic layer by a very thin alkaline, halogen-free layer of zinc, copper, nickel and iron immersion deposited on the bearing metallic layer. To produce such sliding element, a highly-alkaline immersion bath is used containing salts of zinc, nickel, copper and iron mainly cyanide-based. After the immersion treatment, the sliding element blank is rinsed with considerably carbonic acid-free deionized water. During a first tinning step, the sliding element is treated in a bath at a temperature between 20.degree. and 26.degree. C. with a current intensity from 2 to 3 amperes/dm.sup.2 and for a duration of exposure of at least one minute.
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