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AssigneeMax-Planck-Gesellschaft zur Foederung der Wissenschaften e.V.
InventorsHelmut Quast, Johannes Raber, Walter Ott, Hans-Georg von Schnering, Karl Peters
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The present invention provides a process for the currentless deposition of lectropositive metal layers on to appropriate less electropositive metals by contacting an object to be coated with a coating bath, wherein a coating bath is used which contains a metal complex obtained by reacting a monovalent electropositive metal halide with a base, which is capable of complex formation with the electropositive metal, and a hydrohalic acid. The present invention also provides a coating bath for the currentless deposition of electropositive metal layers on to less electropositive metals, wherein said bath contains an electropositive metal complex obtained by reacting a monovalent electropositive metal halide with a base which is capable of complex formation with the electropositive metal and a hydrohalic acid. Furthermore, the present invention provides an electropositive metal complex, obtainable by the reaction of a monovalent electropositive metal halide with a base which is capable of complex formation with the electropositive metal and a hydrohalic acid, followed by precipitation from the reaction mixture.
Process for the currentless deposition of silver or gold on to appropriate less electropositive metals by contacting an object to be coated with a coating bath which contains a metal complex obtained by reacting silver or gold chloride with a base which is capable of complex formation with silver or gold, and hydrochloric acid, the mole ratio of base/silver or gold chloride/hydrochloric acid being (1 to 80)/1/(1 to 2), said object being contacted with said coating bath/or a time sufficient to produce a layer of silver or gold having a thickness of from 0.01 to 4 .mu.m.
Dependencies are inferred from the claim text.