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目前,鋼铁的化学热处理方面許多厂用氰化热处理,其盐浴化学成分大多由NaCN、BaCl_2、BaCO_3、KCl、NaCl、Na_2O等所构成。其中的NaCN含量对防止淬火工件的表面脫碳(有时用于渗碳)有特別重要的作用,且NaCN在高溫时易于分解和被氧化使炉中含量經常发生变化,这样就需定时(一、二小时)进行炉前快速分析,来控制炉中NaCN含量。董子成同志介紹了以KI作指示剂,用AgNO_3滴定氰根的方法。該法手續較煩,分析时間也較长,同时对許多盐浴中由于KCI盐等
At present, many chemical heat treatment of steel with cyanide heat treatment, the salt bath chemical composition mostly by NaCN, BaCl_2, BaCO_3, KCl, NaCl, Na_2O and so on. Among them, NaCN content plays a particularly important role in preventing surface decarburization (sometimes used for carburizing) of a quenched workpiece, and NaCN is easily decomposed and oxidized at high temperatures to cause frequent changes in the content of the furnace, Two hours) for quick analysis of the furnace front to control the furnace NaCN content. Comrade Dong Zicheng introduced KI as an indicator, titration of cyanide with AgNO_3 method. This procedure is more troublesome, analysis time is longer, at the same time on many salt baths due to KCI salt