Metal surface treatment
AssigneeOxy Metal Industries Corporation
InventorsMasanori Nishijima, Nobuyuki Oda, Haruyoshi Terada
Life of this patent
Estimating the term…
Abstract
Disclosed is a method of coating a metal surface by contacting it with an aqueous acidic solution containing hexavalent chromium and either a non-ionic surfactant having the formula RO(CH.sub.2 CH.sub.2 O).sub.n H wherein R = a saturated or unsaturated aliphatic radical of 5 to 25 carbon atoms n = 2 to 30 Or glycine followed by drying and baking the surface. Preferably, the solution also contains urea.
Claims6
An aqueous composition suitable for imparting corrosion resistance to a metal surface comprising a nexavalent chromium compound and from 1 to 30 g/l of non-ionic surfactants of the formula
- RO(CH.sub.2 CH.sub.2 O).sub.n H
- wherein R = a saturated or unsaturated aliphatic radical of 5 to 25 carbon atoms, n = 2 to 30 and glycine in a concentration of from 1 to 50 g/l.
Dependencies are inferred from the claim text.