Hydrated chromium oxide-coated steel strip useful for welded can

Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...

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428632, 428633, 428646, 428648, 428666, 428667, 428679, 428680, 220456, 220 81R, C25D 536

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045018022

ABSTRACT:
A hydrated chromium oxide-coated steel strip which has a satisfactory weldability and resistance to corrosion under a lacquer coating and which is useful for producing welded cans and other containers, comprises a steel strip substrate, plated nickel base layers formed on the surfaces of the steel strip substrate and having a weight of 150-2500 mg per m.sup.2 of each surface of the substrate, hydrated chromium oxide-containing coating layers formed on the surfaces of the plated nickel base layers and having a weight of 2-20 mg, in terms of metallic chromium, per m.sup.2 of each surface of the substrate, and, optionally, plated tin intermediate layers formed between the plated nickel base layers and the chromate-containing coating layers and having a weight of 100-2000 mg per m.sup.2 of each surface of the substrate, the hydrated chromium oxide-containing coating layer optionally being composed of a metallic chromium underlayer in a weight of 10 mg or less per m.sup.2 of each surface of the steel strip substrate and a hydrated chromium oxide upper layer, the sum of the weights of the underlayer and the upper layer being 2-20 mg, in terms of metallic chromium, per m.sup.2 of each surface of the steel strip substrate.

REFERENCES:
patent: 3860398 (1975-01-01), Tsurumaru et al.
patent: 3978803 (1976-09-01), Asano et al.
patent: 4035248 (1977-07-01), Asano et al.
Lyman, T., Ed. Metals Handbook, vol. 2, 8th ed., Am. Soc. Metals, 1964.
Silman, H. et al., Protective and Decorative Coatings for Metals, p. 556, 1978.

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