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    • 6. 发明授权
    • Method for zinc phosphating molded metal articles
    • 磷化锌成型金属制品的方法
    • US5863357A
    • 1999-01-26
    • US833008
    • 1997-04-04
    • Mitsuo ShinomiyaMasashi TakahashiSatoshi MiyamotoTamotsu Sobata
    • Mitsuo ShinomiyaMasashi TakahashiSatoshi MiyamotoTamotsu Sobata
    • C23C22/36C23C22/73C23C22/77C23C8/00
    • C23C22/364C23C22/365C23C22/73
    • Disclosed is a method for zinc phosphating a molded metal article wherein a treating bath composition comprises from 1.5 to 5.0 g/l of zinc ion, from 0.1 to 3.0 g/l of manganese ion, from 5 to 40 g/l of phosphate ion, from 0.05 to 3.0 g/l of a fluorine compound as HF and hydoxylamine as a chemical conversion accelerator. A concentration of hydroxylamine is maintained to satisfy the following relationship:0.5.ltoreq.�hydroxylamine!(g/l)-2.0.times.�Fe.sup.2+ !(g/l).ltoreq.3.0 The treating bath is agitated by a vibratory agitating means provided in the treating vessel so that a mean acceleration a of a treating solution present within a bath region in which the molded metal article is immersed to be treated under fluid agitation is at least 8 cm/sec.sup.2. The mean acceleration is calculated from the following equation: ##EQU1## wherein values of X, Y and Z, each in unit of cm/sec.sup.2, indicate average acceleration values of treating solution in three respective X, Y and Z axial directions which are perpendicular to each other. The velocity changes of the treating solution in a flow state in respective X, Y and Z directions are synchronously measured at measuring locations for 60 seconds to be averaged to obtain the respective average acceleration values in X, Y and Z directions.
    • 公开了一种锌成型金属制品的磷化方法,其中处理浴组合物包含1.5-5.0g / l锌离子,0.1-3.0g / l锰离子,5-40g / l磷酸根离子, 作为HF的0.05〜3.0g / l的氟化合物和作为化学转化促进剂的羟胺。 维持羟胺的浓度以满足以下关系:0.5