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    • 5. 发明申请
    • SURFACE-TREATED STEEL SHEET FOR FUEL TANKS AND METHOD OF FABRICATING SAME
    • 燃料油表面处理钢板及其制造方法
    • WO00032843A1
    • 2000-06-08
    • PCT/KR1999/000722
    • 1999-11-30
    • B05D1/28B05D7/14B32B15/04B32B15/08C09D123/04C09D123/10C09D127/12C09D161/28C09D163/00C09D171/10C09D183/00C09D191/06C23C22/26C23C22/27C23C22/28C23C22/30C23C22/32C23C22/37C23C28/00C23C30/00
    • C23C28/3225C23C28/00C23C28/345C23C30/00C23C2222/20Y10S428/926Y10S428/935Y10T428/12014Y10T428/12549Y10T428/12569Y10T428/12611Y10T428/12799Y10T428/12951Y10T428/31511Y10T428/31551Y10T428/31942
    • A surface-treated steel sheet for fuel tanks includes a cold-rolled steel sheet with a low carbon content, a zinc or zinc-based alloy plating layer formed on the steel sheet, and a chromate film coated on the zinc or zinc-based plating layer. The chromate film is formed from a chromate solution. The chromate solution includes a subject solution containing a chrome aqueous solution where a ratio of trivalent chrome ions is in the range of 0.4-0.8 and a concentration of chrome is in the range of 5-50g/l. Phosphoric acid of 20-150wt.% with respect to the chrome content, 10-100wt.% of fluoric acid, 50-2000wt.% of colloidal silica having pH of 2-5, and 5-30wt.% of sulfuric acid are mixed with the chrome aqueous solution. An aqueous solution of 5-50wt.% with respect to the subject solution are added to the subject solution. The aqueous solution contains Epoxy-based silane of 2-10wt.% with respect to all of the aqueous solution for hardening agent and has pH of 2-3. A resin coating layer is formed on one side or both sides of the chromate film. A resin coating layer is formed from a resin solution. The resin solution includes a phenoxy resin solution having a molecular weight of 25,000-50,000, colloidal silica of 10-20phr with respect to the phenoxy resin content, and melamine resin of 2-15phr with respect to the phenoxy resin content.
    • 用于燃料箱的表面处理钢板包括具有低碳含量的冷轧钢板,在钢板上形成的锌或锌基合金镀层,以及涂覆在锌或锌基镀层上的铬酸盐膜 层。 铬酸盐膜由铬酸盐溶液形成。 铬酸盐溶液包括含有铬水溶液的目标溶液,其中三价铬离子的比例在0.4-0.8范围内,铬的浓度在5-50g / l的范围内。 相对于铬含量为20-150重量%的磷酸,10-100重量%的氟酸,50-2000重量%的pH为2-5的胶体二氧化硅和5-30重量%的硫酸被混合 与铬水溶液。 将相对于本发明溶液的5-50重量%的水溶液加入到本发明溶液中。 该水溶液含有相对于所有固化剂水溶液为2-10重量%的环氧基硅烷,pH为2-3。 在铬酸盐膜的一面或两面上形成树脂涂层。 由树脂溶液形成树脂被覆层。 树脂溶液包含分子量为25,000-50,000的苯氧基树脂溶液,相对于苯氧基树脂含量为10-20phr的胶体二氧化硅和相对于苯氧基树脂含量为2-15phr的三聚氰胺树脂。