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    • 11. 发明专利
    • Steel sheet for fuel tank and method for manufacturing the same
    • 燃油罐用钢板及其制造方法
    • JP2011021279A
    • 2011-02-03
    • JP2010248914
    • 2010-11-05
    • Jfe Steel CorpJfeスチール株式会社
    • TADA CHIYOKOUNNO SHIGERUOGAWA TAKASHI
    • C23C28/00C23C22/26C23C22/30C23C22/33C25D5/48C25D7/00
    • C25D5/48C23C22/26C23C22/30C23C22/33C23C28/3225C23C28/345
    • PROBLEM TO BE SOLVED: To provide a steel sheet for a fuel tank which exhibits excellent corrosion resistance for a fuel such as a gasoline, alcohol, or an alcohol-mixed gasoline for a long period of time without using Pb. SOLUTION: The steel sheet for a fuel tank, which has an electrolytic Zn-Ni alloy plating layer containing 5 to 30 mass% of Ni and being plated on at least one surface of the steel sheet in a coating weight of 1 to 40 g/m 2 per surface, and a chromate coating film formed on the alloy plating layer. The chromate coating film is obtained by coating the surface of the alloy plating layer with a chromate treatment liquid containing chromic acid in which the mass ratio (trivalent chromium/total chromium) is >0.5, phosphoric acid in which the mass ratio (phosphoric acid)/(total chromium) is 0.1 to 5.0, an inorganic inhibitor in which the mass ratio to hexavalent chromium is COPYRIGHT: (C)2011,JPO&INPIT
    • 解决的问题:提供一种用于燃料箱的钢板,其对于诸如汽油,酒精或醇混汽油的燃料在长时间内不使用Pb表现出优异的耐腐蚀性。 解决方案:一种用于燃料箱的钢板,其具有含有5〜30质量%的Ni的电解Zn-Ni合金镀层,并以钢板的至少一个表面镀覆,重量为1〜 每个表面40g / m 2&lt; SP&gt;和形成在合金镀层上的铬酸盐涂膜。 通过用质量比(三价铬/总铬)> 0.5的铬酸的铬酸盐处理液涂布合金镀层的表面,得到铬酸盐涂膜,其中质量比(磷酸) /(总铬)为0.1〜5.0,与六价铬的质量比<0.05的无机抑制剂和总铬的质量比为0.1〜0.4,然后进行加热的有机还原剂, 在浸入沸水中30分钟后铬的涂层重量的变化与钢板浸渍前的比例为2%以下。 版权所有(C)2011,JPO&INPIT