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    • 2. 发明授权
    • Nitriding of iron and steel parts in salt bath having improved corrosion resistance
    • 在具有改善的耐腐蚀性的盐浴中的铁和钢部件的渗氮
    • US07238244B2
    • 2007-07-03
    • US10416710
    • 2001-11-28
    • Tokuo SatoYutaka SawanoTetsuya YamamuraKazuyoshi KurosawaHumihide NakamuraMotohiro Tenmaya
    • Tokuo SatoYutaka SawanoTetsuya YamamuraKazuyoshi KurosawaHumihide NakamuraMotohiro Tenmaya
    • C23C8/50
    • C23C8/50C23C8/52
    • A new nitriding process by using a salt bath to produce iron and steel parts having excellent abrasion resistance and corrosion resistance includes forming an iron lithium complex oxide layer at the outermost surface of the iron part by immersing the iron and steel parts in a salt bath containing cationic component of Li, Na and K and anionic components of CNO−and CO32−, where hydroxide compound selected from lithium hydroxide, sodium hydroxide and potassium hydroxide are added to the salt bath. Materials being in a hydrated state or in a free water containing state can be used for preparation or replenishing of the salt bath. Moistened air of (1×10−2 kg·H2O)/(1 kg dry air) can be used for mixing the salt bath. Containing ratio of Li, Na, K is preferable where a solidifying temperature of the mixture of carbonates of Li, Na, K in that ratio is lower than 500° C. It is preferable that the mol ratio of Na and K is to be 2:8˜8:2, the content of CNO− is to be 5˜35 wt %, the content of CN− in the salt bath is less than 2 wt % and the temperature of the salt bath is to be 450˜650° C.
    • 通过使用盐浴来生产具有优异的耐磨性和耐腐蚀性的钢铁部件的新的氮化方法包括在铁部件的最外表面上形成铁锂复合氧化物层,将铁和钢部件浸入含有 Li,Na和K的阳离子成分和CNO - 和SO 3 - 2 - 的阴离子组分,其中选自氢氧化锂,钠 将氢氧化物和氢氧化钾加入到盐浴中。 处于水合状态或自由含水状态的材料可用于制备或补充盐浴。 可以使用(1×10 -2 -2.H 2 O)/(1kg干燥空气)的润湿空气来混合盐浴。 当Li,Na,K的碳酸盐混合物的固化温度低于500℃时,优选Li,Na,K的含有比例。Na和K的摩尔比优选为2 :8〜8:2,CNO 的含量为5〜35重量%,盐浴中CN 的含量小于2重量% 盐浴的温度为450〜650℃。