| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.22 ( May 1990 ) Advanced Technologies of Iron and Steel, Commemorating the 20th Anniversary of the Technical Research Division ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Progress in Precoated Steel Sheets for Automotive Use Koji Yamato, Toshio Ichida, Toshio Irie |
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Synopsis : Corrosion of automotive bodies, caused by road deicing salt, has forced automakers to change body materials from conventional cold rolled steel sheets to precoated steel sheets. The authors have developed one-side Zn-coated steel and Zn-Ni alloy-electroplated steel which exhibits excellent corrosion resistance in spite of its light coating weight. Moreover, double layered Fe-P/Zn-Ni and Fe-P/Zn-Fe alloy electroplated steels have been developed which offer phosphatability and paintability properties of Zn alloys equivalent to those of cold-rolled steel. In the light of these developments, recent developments in organic composite coating (thin organic resin/Zn-Ni alloy), galvannealed steel with anti-powdering qualities and ultra-fine alumina dispersed Zn-Co-Cr-Al2O3 electroplating are described in this paper. |
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