Abstract
Research and development on zinc coated steel sheets have been intensively carried out in order to achieve so called 3 Rs(Reduce, Reuse and Recycle) toward establishment of recycling-based society and high quality and cost performances. The galvannealing reaction and structure of the coatings have been investigated and lubricative inorganic and organic coatings have been developed, leading to a remarkable improvement of press formability of galvannealed steel sheet for automotive body panels. Pb-free and Cr(Cr6+ and Cr3+)-free coated steel sheets have been developed for both automobile and electric appliance industries to reduce hazardous substances. For building use, corrosion-resistant coated steel sheets with thin organic coatings on 55% Al-Zn alloy and also hot-dipped alloy coatings containing Mg have been developed. This is to meet the needs for long time duration of products and minimizing maintenance. The research and development on zinc coated steel sheets are reviewed in the paper.
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