USE OF POLYMERS COMPRISING QUATERNARY AMMONIUM GROUPS AND UREA GROUPS AS CORROSION INHIBITORS FOR COPPER SURFACES

摘要

The invention relates to a method for protecting the surfaces of copper or copper alloys from corrosion. According to said method, the metallic surface is brought into contact with an aqueous medium which contains, as a corrosion inhibitor, a quaternary polymer comprising ammonium groups and urea groups, thiourea groups and/or iminourea groups in a numerical ratio of between 1.5 : 1 and 2.5 : 1.