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Zn-Al hot-dip galvanized steel sheet having improved resistance against secular peeling of coating
Zn-Al hot-dip galvanized steel sheet having improved resistance against secular peeling of coating
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机译:锌-铝热浸镀锌钢板具有改善的耐涂层长期剥离性能
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摘要
A Zn-Al hot-dip galvanized coating on a steel sheet may exhibit intergranular corrosion and be degraded due to the Al's secular enrichment in the grain boundaries of coating. This is prevented in accordance with the present invention by the galvanizing bath composition which contains from 0.15 to 10% of Al, from 0.1 to 1% of Sb, from 0.01 to 2% of Si, and the balance being Zn and unavoidable impurities such as Pb, Sn, and Cd in an amount less than 0.02%, and additionally contains at least from 0.01 to 1% of at least one member selected from the group consisting of Mg and mischmetal.
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