Steel sheet with enhanced corrosion resistance having a silane t

Details Steel sheet with enhanced corrosion resistance having a silane t Steel sheet with enhanced corrosion resistance having a silane t

1991-07-12

1993-04-06

Lewis, Michael

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428645, B32B 1518

Patent

active

052002756

ABSTRACT:
Steel sheet coated with a relatively insoluble, inorganic, corrosion resistant coating. A silicate coating is formed on a steel sheet by rinsing the sheet for at least 30 seconds in an alkaline aqueous solution containing 0.005 M silicate, 0.005 M metal salt and having a temperature of at least 25.degree. C. The sheet is dried to form an adherent silicate coating having a thickness of at least 2 nm prior to being treated with an aqueous solution containing 0.5-5 vol.-% silane. If the sheet is painted, the silane film forms an adherent bond between the paint and the silicate coating. A silane treated silicate coating minimizes red rusting on terne coated steel by sealing pin holes. A silane treated silicate coating also provides good corrosion protection and paint adherence on cold-rolled or galvanized steel.

REFERENCES:
patent: 3415613 (1968-12-01), Ault et al.
patent: 4407899 (1983-10-01), Hare et al.
patent: 4411964 (1983-10-01), Hare et al.
patent: 4419137 (1983-12-01), Cayless et al.
Harold Knight, "Lead Coatings on Steel", Nov. 1944, Reprint from Metals and Alloys.
van Ooij and Sabata, "Development of an Inorganic Non-Chromate Post-Rinse Treatment for the Stabilization of Phosphate Conversion Coatings on Cold-Rolled and Electrogalvanized Steels", International Conference on Corrosion Control by Organic Coatings, Cambridge, UK, 11-14 Apr. 1989.
van Ooij & Sabata, "A Research Look at the Effect of Pretreatment on the Corrosion Resistance of Automotive Sheet Steels", Pretreat '90, pp. 5-1 to 5-26, Cincinnati. Ohio, Nov. 6-8, 1990.

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