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    • 5. 发明授权
    • High corrosion resistance composite plated steel strip
    • 高耐腐蚀复合镀钢带
    • US4650724A
    • 1987-03-17
    • US741824
    • 1985-06-06
    • Shigeru UminoKoji YamatoHajime KimuraToshio Ichida
    • Shigeru UminoKoji YamatoHajime KimuraToshio Ichida
    • C23C2/06C25D3/56B32B15/00
    • C25D3/565Y10S428/935Y10T428/12799
    • Composite plated steel strips comprising a zinc base layer electrodeposited on at least one surface of a steel strip exhibit excellent corrosion resistance with or without painting provided that the zinc base layer contains 0.1 to 10% by weight of cobalt, 0.05 to 5% by weight of chromium, 0.05 to 8% by weight of aluminum, and optionally, 0.05 to 5% by weight of Si, the balance being zinc. Such composite plated steel strips are prepared by subjecting a steel strip to composite electroplating in an acidic zinc plating bath which contains at least one water-soluble compound of Co.sup.2+ in an amount of 0.3 to 60 g/l of metallic cobalt, at least one water-soluble compound of Cr.sup.3+ in an amount of 0.2 to 2.5 g/l of metallic chromium, a pseudo-boehmite like alumina sol in an amount of 0.5 to 20 g/l of alumina, and optionally, colloidal silica in an amount of 0.5 to 20 g/l of silica of pH 1 or higher and a current density of at least 40 A/dm.sup.2.
    • 包含电沉积在钢带的至少一个表面上的锌基层的复合镀钢钢带,如果锌基层含有0.1〜10重量%的钴,0.05〜5重量%的钴, 铬,0.05〜8重量%的铝和任选的0.05〜5重量%的Si,余量为锌。 这种复合镀钢钢带是通过将钢带复合电镀在含有至少一种Co 2+的水溶性化合物的酸性镀锌浴中,其量为0.3至60g / l的金属钴,至少一种水 0.2〜2.5g / l的金属铬的可溶性Cr 3+化合物,0.5〜20g / l的氧化铝等的假勃姆石类氧化铝溶胶,以及任意的0.5〜 pH为1或更高的20g / l二氧化硅和至少40A / dm 2的电流密度。