Process for providing coatings on a metallic surface

US6488990B1 · kind B1 · utility

Assignee

• CHEMETALL GMBH · DE

Inventors

• Sean M. Wetterer · Berkeley Heights, US
• Lars Sebralla · Bruchköbel, DE
• Manfred Walter · Nuremberg, DE

Key dates

• Filing date: Oct 6, 2000
• Grant date: Dec 3, 2002
• Expiry date: Oct 6, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C22/83
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

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 orga…