Process for improving the anti-corrosion properties of steel coated with nickel or cobalt

摘要

A process is provided for coating a ferrous metal article, e.g. steel or iron, with a corrosion resistant surface layer comprising first coating said article with a layer of nickel and/or cobalt, heating said coated article for a time less than 45 minutes at a temperature in excess of 725 DEG C and then applying to said first metal layer an additional layer of at least one of the metals selected from the group consisting of chromium, tin, lead, zinc, copper and cadmium.