Anticorrosive overlap-coated iron or steel material

C - Chemistry – Metallurgy – 25 – D

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C25D 5/10 (2006.01) C25D 5/48 (2006.01)

Patent

CA 1129804

ANTICORROSIVE OVERLAP-COATED IRON OR STEEL MATERIAL Abstract of the Disclosure Anticorrosive overlapped coatings so far employed for such iron and steel materials as plates, pipes, bars or wires are formed by electroplating an Sn base - Zn alloy layer on the surface of the iron or steel material and applying a chromate-treatment to the alloy layer. How- ever, this requires a long time for the formation of a plated layer of a suitable thickness, and consequently a reduction of the plating time together with a further improvement of the anticorrosive effect is desired. The present invention has succeeded in making it possible to reduce the plating time while improving the anticorrosion effect and in improving the productivity by forming the electroplated layer of an Sn base - Zn alloy directly, or over an electroplated layer of Zn, on the surface of the iron or steel material, then forming an electroplated layer of Zn on the layer of the alloy, and further apply- ing a chromate-treatment on the Zn layer.

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