当曲轴或机床主轴氮化后,工作表面存在脆性“白层”时,不利于工作,必须将其除掉。这里介绍的消除“白层”的化学机械方法是美国的专利。方法是将有脆性“白层”的零件浸泡于70～90℃的氰化钠溶液中(配方为:一加仑水中含一磅氰化钠),一段时间以后,使得白层松碎,这时取出零件,用氧化铝砂子在5～6公斤/厘米~2的压力下进行喷抛清理。假如零件 When the crankshaft or the spindle of the machine tool is nitrided, there is a brittle “white layer” on the working surface, which is unfavorable to the work and must be removed. Here to eliminate the “white layer” of the chemical mechanical method is the United States patent. Method is to have a brittle “white layer” parts soaked in 70 ~ 90 ° C sodium cyanide solution (formula: a gallon of water containing a pound of sodium cyanide), after a period of time, making the white layer loose, then Remove the parts, with alumina sand blasting at a pressure of 5 ~ 6 kg / cm ~ 2. If parts