C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/11, 204/21.7
C25D 5/12 (2006.01) C25D 5/16 (2006.01) C25D 5/50 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1331962
PROCESS FOR PRODUCING A MULTILAYER-COATED STEEL STRIP HAVING EXCELLENT CORROSION RESISTANCE AND WELDABILITY AND USEFUL FOR CONTAINERS ABSTRACT OF THE DISCLOSURE A multilayer-coated steel strip having an excellent corrosion resistance and weldability and useful for cans and containers is produced by a process in which a steel strip substrate is plated with nickel or a nickel-based alloy to form nickel based coating layers each having an average amount of 2 to 10 mg/m2, provided with a number of convex and concave portions thereof, portions of which layers having a coating thickness of 0.001 µm or more have a total area corresponding to 10 to 90% of the entire area of the surfaces of the substrate; the nickel based plated substrate is coated with tin to form tin coating layers on the nickel-based coating layers, each of which tin coating layers has an average amount of 200 to 2000 mg/m2; the resultant precursory coated steel strip is heated at a temperature equal to or higher than the melting point of tin to convert the nickel-based coating layers and the tin coating layers to base coating layers consisting essentially of an Fe-Ni-Sn-based alloy and having a number of convex and concave portions thereof, and intermediate coating layers formed on the base coating layers, consisting essentially of tin and having a number of convex and concave portions thereof; and then an electrolytic chromate treatment is applied onto the intermediate tin coating layers to form surface coating layers consisting of electrolysed chromate.
532926
Ezure Kazuya
Saito Takao
Goudreau Gage Dubuc
Nippon Steel Corporation
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