Coated silicon-iron product and process therefor using calcium formate

摘要

A relatively thin coat of calcium metaborate is electrolytically-applied from a solution of calcium formate with boric acid directly to the surface of a boron-containing electrical steel and a substantially thicker overcoat of Mg(OH)2 is electrolytically-deposited on the calcium metaborate coating to provide a duplex coating about 0.2 mil thick.