Coating processes – With pretreatment of the base – Metal base
Patent
1990-12-24
1992-04-28
Lusignan, Michael
Coating processes
With pretreatment of the base
Metal base
422 13, 427337, 427387, 4273884, 428632, B05D 302
Patent
active
051087936
ABSTRACT:
Steel sheet coated with a nontoxic, 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: 4407899 (1983-10-01), Hare et al.
patent: 4411964 (1983-10-01), Hare et al.
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.
Sabata Ashok
van Ooij Wim J.
Armco Steel Company, L.P.
Bunyard R. J.
Fillnow L. A.
Johnson R. H.
Lusignan Michael
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