Process for removing soap-contaminated conversion layers on metal
workpieces
    1.
    发明授权
    Process for removing soap-contaminated conversion layers on metal workpieces 失效
    在金属工件上清除皂污染的转化层的方法

    公开(公告)号:US6153015A

    公开(公告)日:2000-11-28

    申请号:US202016

    申请日:1998-12-08

    IPC分类号: C23G1/12 C23G1/36 C23G1/02

    CPC分类号: C23G1/36 C23G1/125

    摘要: The process for removing a soap-contaminated conversion layer remaining on a metal workpiece after cold-forming with an aqueous acidic cleaning composition containing water, a surfactant such as an alkyl amine ethoxylate and nitric acid, phosphoric acid and/or amidosulphonic acid includes immersing the contaminated metal workpiece in the aqueous acidic cleaning composition at a temperature above 60.degree. C. until it has a clean bright surface and a fatty acid formed by reaction of the soap in the conversion layer is dispersed in the cleaning composition and then subsequently separating the metal workpiece from the cleaning solution and, after the separating, cooling the recovered aqueous acidic cleaning composition to a temperature below 55.degree. C. until a fatty acid layer including the fatty acid is separated from the aqueous acidic cleaning composition. The fatty acid layer is removed from the aqueous acidic cleaning composition to form a reusable aqueous acidic cleaning composition and then other metal workpieces are cleaned with the reusable aqueous acidic cleaning composition.

    摘要翻译: PCT No.PCT / EP97 / 01966。 371日期1998年12月8日第 102(e)日期1998年12月8日PCT 1997年4月18日PCT PCT。 第WO97 / 43462号公报 日期:1997年11月20日使用含有水的表面活性剂,烷基胺乙氧基化物和硝酸的表面活性剂,磷酸和/或其盐进行冷成型后,残留在金属工件上的皂污染的转化层的除去方法 酰胺磺酸包括将污染的金属工件浸渍在高于60℃的水性酸性清洁组合物中,直到其具有干净的明亮表面,并且通过转化层中的皂的反应形成的脂肪酸分散在清洁组合物中, 然后随后将金属工件与清洁溶液分离,并且在分离之后,将回收的水性酸性清洁组合物冷却至低于55℃的温度,直到包含脂肪酸的脂肪酸层与酸性清洁组合物水分离。 将脂肪酸层从含水酸性清洁组合物中除去以形成可重复使用的酸性水性清洁组合物,然后用可重复使用的酸性清洗组合物清洗其它金属工件。