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US 4,053,329 AGranted
Method of improving corrosion resistance of metal substrates by passivating with an onium salt-containing material
AssigneePPG Industries, Inc.
InventorsNicholas T. Castellucci, Joseph F. Bosso
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Abstract
A method of providing improved corrosion resistance to coated metal substrates is disclosed. The process of the invention involves a passivating pretreatment with an onium salt before coating. The invention is particularly effective with ferrous metal substrates.
Claims18
A method of providing improved corrosion resistance to ferrous metal substrates, comprising:
- (a) passivating the surface of the substrate by pretreatment with an at least 3 percent by weight dispersion or solution in a compatible vehicle of an onium salt selected from the class consisting of:
- (R).sub.4 N.sup..sym. A.sup..crclbar. , (R).sub.4 P.sup.+A.sup.-, (R).sub.3 S.sup.+A.sup.-
- where R are organic radicals and A is an anion of a weak acid which will not detrimentally attack the surface of the ferrous substrate, followed by
- (b) directly coating the pretreated metal surface with an adhesive or protective coating material.
1 more element
A metal article coated by the method of claim 17.
Dependencies are inferred from the claim text.