| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.12 ( July 1985 ) Special Issue on Hot-and Cold-rolled Steel Sheets ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Organic Composite-Coated Steel Sheet "Zincrometal-KII" with High Corrosion Resistance Shunichi Tsugawa, Taizo Mohri, Hiroshi Hosoda, Shigeru Kobayashi, Toshio Ichida |
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Synopsis : "Zincrometal-KII", a new organic composite-coated steel sheet with high corrosion resistance has been developed, in which improvements are made in coating adhesion during forming and weldability of conventional zinc rich paint coated steels for automobiles. It consists of a specially improved thinner zinc rich paint layer on a thin Zn-Ni alloy electroplated layer, and has been improved according to the following ideas: (1) Corrosion resistance is improved by the complex effects of a Zn-Ni alloy electroplated layer and zinc rich paint layer which contains zinc potassium chromate as an anti-corrosive pigment. (2) Better coating adhesion during forming is obtained by the addition of MoS2 as a lubricant agent. (3) Weldability is improved by the thinner paint layer. Therefore, coating adhesion during forming and corrosion resistance are superior than conventional paint coated steels, and the number of welds in continuous spot welding is more than 5000. |
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