Heat resistant precoated steel sheet and process for the...

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B32B 15/20 (2006.01) F01N 13/16 (2010.01) B05D 7/00 (2006.01) B05D 7/16 (2006.01)

Patent

CA 1243562

HEAT RESISTANT PRECOATED STEEL SHEET AND PROCESS FOR THE PRODUCTION THEREOF Abstract of the Disclosure A heat resistant precoated steel sheet suitable for use in the manufacture of a muffler of an automobile exhaust gas system comprising : a hot dip aluminized steel sheet, a chromate pretreatment layer formed on at least one surface of said hot dip aluminized steel sheet and having a chromium pick-up of 10 to 50 mg/m2, a primer coat formed on said pretreatment layer and comprising a cured polyamide imide resin and 8 to 52 parts by weight, based on 100 parts by weight of said resin, of strontium chromate intimately admixed with said resin, and a top coat formed on said primer coat and comprising a cured polyamide imide resin and 8 to 32 parts by weight, based on 100 parts by weight of said resin, of aluminum scale intimately admixed with said resin.

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