ELECTRODEPOSITION BATH CONTAINING YTTRIUM

摘要

PROBLEM TO BE SOLVED: To impart improved corrosion resistance to an electrodeposition coated metal substrate especially to untreated steel. SOLUTION: Improved electrodeposition bath compositions comprising resinous phase dispersed in an aqueous medium are disclosed. The resinous phase being comprised of an active hydrogen containing ionic electrodepositable resin and a curing agent where the improvement comprises the addition to an electrodeposition bath of at least one source of yttrium in an amount of about 10 to 10,000 parts per million of total yttrium based on electrodeposition bath weight. The electrodeposition bath compositions are preferably cationic and provide for excellent corrosion resistance over a variety of metal substrates including untreated steel. Also a method of electrocoating a conductive substrates using the improved electrodeposition bath compositions. Metallic substrates which are coated using the method are also disclosed. COPYRIGHT: (C)2011,JPO&INPIT