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氟化铵在粒状渗铬剂中用作活化剂,它可加快渗铬剂在钢铁零件表面的渗铬速度,而渗铬剂经多次渗铬处理后,氟化铵的含量将不断发生改变,准确测定其含量的变化,对渗铬剂的研制、生产及渗铬机理的探讨很有必要。我们用离子选择电极对渗铬剂经多次处理后的氟含量进行了测定。结果表明:在pH为9,磺基水杨酸,EDTA配制的离子强度调节剂存在下,对1.0~(-1)～10~(-4)M的氟离子测定有较高的准确度和精密度,且方法简便。一仪器与试剂 DD-2B 型电极电位仪
Ammonium fluoride is used as an activator in granular chromicum, which accelerates the rate of chromium penetration on the surface of steel parts. The content of ammonium fluoride will change continuously after multiple chromizing treatments , Accurate determination of its content changes, the development of chromiumizing agent, production and chromium penetration mechanism is necessary. We measured the fluoride content of the chromizing agent after multiple treatments with an ion-selective electrode. The results show that fluoride ion with 1.0 ~ (-1) ~ 10 ~ (-4) M has high accuracy in the presence of sulfosalicylic acid and EDTA with ionic strength regulator Precision, and the method is simple. An instrument and reagent DD-2B-type electrode potentiometer