Method of galvanizing steel parts
AssigneeMiele & Cie. KG
InventorsHeinrich Warnke, Friedel Kaup
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Abstract
A method for coating a steel part wherein the steel part is introduced into an activation bath containing metal salts such as copper and silver salts which are nobler in potential than iron to deposit a layer of the nobler metal on the surface of the steel part. The part is then immersed in a galvanizing bath in which the part is coated with zinc. Preferably, the galvanized steel part is then electrophoretically enamelled.
Claims19
A method for coating a steel part comprising introducing the steel part into an activation solution which contains a metal salt which is nobler in potential than iron to non-electrolytically deposit a layer of the nobler metal on the surface of the steel part and subsequently immersing the thus-coated steel part in a galvanizing bath containing a zinc salt whereupon a similar layer of zinc is electrogalvanized onto the steel part.
A method for coating a steel part comprising immersing the steel part into an activation solution comprising an acid bath at a pH ranging from about 0.3 to 6.0 and containing a metal salt which is nobler in potential than iron, heating the activation solution containing the thus-immersed steel part at a temperature of about from 18.degree. C. to 90.degree. C. for at least about 10 seconds whereupon a layer of the nobler metal is non-electrolytically coated on the surface of the steel part, and then immersing the thus-coated steel part in a galvanizing bath containing a zinc salt whereupon a similar coating of zinc is electrogalvanized onto the steel part.
Dependencies are inferred from the claim text.