Process for improving the corrosion resistance of ferrous metal parts
    1.
    发明授权
    Process for improving the corrosion resistance of ferrous metal parts 失效
    提高黑色金属部件耐腐蚀性的工艺

    公开(公告)号:US4608092A

    公开(公告)日:1986-08-26

    申请号:US713633

    申请日:1985-03-19

    CPC分类号: C23C8/80 C23C22/72

    摘要: A process for improving the corrosion resistance of ferrous metal parts also subject to heat and chemical treatment following nitriding in association or not with carburizing and/or sulfurizing essentially comprises immersing the parts in a known bath of molten salts to which is added a sufficient quantity of a halogenophosphate having formula:M.sub.2 (PO.sub.3 X).sub.min which X and is fluorine and M is a metal of subgroup Ia, IIa or IIb of the periodic table of elements, having the valency m. The preferred halogenophosphate is sodium, potassium, calcium or zinc monofluorophosphate. The molten salt bath may be of the oxidizing type, comprising for example, 65% by weight KOH, 25% NaNO.sub.3, 10% Na.sub.2 CO.sub.3, or of the neutral type, for example a eutectic mixture of 50% BaCl.sub.2, 30% CaCl.sub.2, 20% NaCl. The halogenophosphate may be added in proportions of 0.1 to 20 g per kilogram of salt bath.

    摘要翻译: 一种用于提高耐腐蚀性的方法,也可以在渗氮与渗碳和/或硫化相关联之后进行加热和化学处理,主要包括将部件浸入已知的熔盐浴中,向其中加入足量的 具有式:M2(PO3X)m的卤代磷酸酯,其中X和是氟,M是元素周期表的Ia,IIa或IIb族的金属,具有化合价m。 优选的卤代磷酸盐是单氟磷酸钠,钾,钙或锌。 熔融盐浴可以是氧化型,包括例如65重量%的KOH,25%的NaNO 3,10%的Na 2 CO 3或中性的,例如50%的BaCl 2,30%的CaCl 2,20的共晶混合物 %NaCl。 卤磷酸盐可以以每公斤盐浴0.1-20g的比例加入。