Abstract: An anticorrosive overlapped coating so far practiced as applied to such iron and steel materials as plates, pipes, bars or wires is formed by electroplating an iron or steel material on the surface with an Sn base - Zn alloy layer and applying a chromate-treatment on it. However, this requires such long time in forming a plated layer thickness that a reduction of the plating time together with a further improvement of the anticorrosion is hoped for today. The present invention has succeeded in making it possible to reduce the plating time while improving the anticorrosion and in improving the productivity by forming an electroplated layer of an Sn base - Zn alloy directly or through an electroplated layer of Zn on the surface of a steel material, then forming an electroplated layer of Zn on the electroplated layer of said alloy and further applying a chromate-treatment on said Zn layer.

Abstract: Wear and corrosion resistant coatings are obtained using the plasma or d-gun techniques and applying a coating material consisting of carbides and nickel-containing base alloy having 6-18 wt.% boron.

Abstract: A solar heat collector comprising a metallic substrate having nodular or dendritic surfaces coated with a black absorber coating, and the method of preparing same.

Abstract: A novel fastening means of a highly corrosion resistant nature and presenting a bright chrome-like outer appearance.

Abstract: Superior solar energy absorption selectivity is found with blackened white brass electroplated surfaces in which the white brass contains 0.5 to 20% by weight copper, balanced zinc, which has been electroplated using certain brighteners such as 1-benzl pyridinium, 3-carboxylate and then blackened with a weak solution of nitric acid.