Electrical conductor made of copper-plated and tin-plated aluminum
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United States of America Patent
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Oct 12, 1999
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app pub date -
Mar 13, 1997
filing date -
Nov 22, 1993
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Abstract
An electrical conductor consisting of an at least partially aluminium-based central core coated by continuous electrodeposition with at least one metal layer, including pretreatment of the surface of the core, characterized in that the following are subsequently performed successively on the core, a) an electrochemical deposition of copper in an aqueous bath maintained at a temperature of between 20.degree. C. and 60.degree.C., containing KCN, CuCN, K.sub.2 CO.sub.3 and KNaC.sub.4 H.sub.4 O.sub.6 with a current intensity of between 1 and 10 A/dm.sup.2 ; b) rinsing at ambient temperature; c) an electrochemical deposition of tin in an aqueous bath maintained at a temperature of between 20.degree. C. and 60.degree. C., containing essentially tin dissolved in methanesulphonic acid and, optionally, additives, with a current intensity of between 1 and 100 A/dm.sup.2 ; d) rinsing with water at 60.degree.C.
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