Abstract
A new electrogalvanizing line started its operation in January, 1982 at Chiba Works, Kawasaki Steel Corporation, which has several excellent characteristics on operation and products such as below mentioned.
(1) Plating voltage of CAROSEL method with chloride bath is so low as under 10 V for the current density 150 A/dm2.
(2) Uncoated surface of one-side electrogalvanized product, which is perfectly free from Zn throw-around, has good phosphatability and paintability similar to those of cold rolled product.
(3) Newly designed counter flow system increases limited current density of Zn plating up to 200 A/dm2.
(4) Zinc phosphate product has excellent whiteness and good paintability owing to appropriate control of Ni content in the phosphate film.
(5) Hydrogen quantitative feeding method has been developed for smaller deviation of Cr coating weight and color tone of chromate product. Resin coating on chromate product improves corrosion resistance and antifingerprint property.
