Process of protective coating of iron and steel products

Metal treatment – Compositions – Heat treating

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427433, C23C 2200

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active

048013382

ABSTRACT:
A process of protective coating of iron and steel products is described, wherein an adherent and rough layer of scale is formed, on which is directly deposited a layer of a protective material. The qualities of the layer of scale result from the fact that the product is shaped hot and the speed of its cooling is controlled so that the resultant thickness of scale is less than a threshold of adherence characteristic of the material and of the temperature at the end of shaping. The layer of protective material is obtained by metallization with zinc or an alloy based on zinc. The invention is principally applicable to long iron and steel products, and in particular to reinforcing bars for concrete.

REFERENCES:
patent: 3085034 (1963-04-01), Croessant et al.
patent: 3925579 (1975-12-01), Flinchun et al.
patent: 4214015 (1980-07-01), Stephan
patent: 4297398 (1981-10-01), Paulus
patent: 4425383 (1984-01-01), Abatura
Review of Current Literature on the Paint and Allied Industries, vol. 22, No. 129, May, Jun. 1949, p. 265, The Paint Research Association, Teddington, GB; H. Ketterl: "Rust Layers as Adhesion-Promoting Surfaces for Painting"; Abstract.
Patent Abstracts of Japan, vol. 3, No. 157 (C-68), Dec. 22, 1979, p. 79 regarding JP-A-54 133 438 (Shin Nippon Seitetsu K.K.) 17-10-1979.
French Search Report.

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