| abstract |
Sequentially applying two different coatings, in two steps, to metallic surfaces. Metallic surfaces are contacted at temperatures from 10-100° C. with aqueous solution A and then with aqueous solution B, or vice versa, whereinsolution A contains an effective amount of zirconium, hafnium, titanium, silicon and/or boron, and of fluoride as ions and/or complex ions able to pickle metallic surfaces and generate a coating on the pickled metallic surface and that solution B contains an effective amount of one or more of XYZ, X*Y*Z* and/or X*Y*Z*Y*X* where Y is an organic group with 2-50 carbons,where X as well as Z is a group-each same or different-of OH-, SH-, NH2-, NHR-, CN-, CH=CH2-, OCN-, CONHOH-, COOR', acrylamide-, epoxide-, CH2=CR''-COO-, COOH-, HSO3-, HSO4-, (OH)2PO-, (OH)2PO2-, (OH)(OR')PO-, (OH)(OR')PO2-, SiH3-, Si(OH)3-,where R' is an alkyl group with 1-4 carbons,where R'' is hydrogen or an alkyl group with 1-4 carbons,and where X and Z are each bound to the Y in their terminal position,where Y* is an organic group with 1-30 carbons,where X* as well as Z* is a group-each same or different-of OH-, SH-, NH2-, NHR'-, CN-, CH=CH2-, OCN-, CONHOH-, COOR', acrylamide-, epoxide-, CH2=CR''-COO-, COOH-, HSO3-, HSO4-, (OH)2PO-, (OH)2PO2-, (OH)(OR')PO-, (OH)(OR')PO2-, SiH3-, Si(OH)3-,N-CH2-PO(OH)2-, -N-[CH2-PO(OH)2]2- where R' is an alkyl group with 1-4 carbons, where R''is hydrogen or an alkyl group with 1-4 carbons. |