三价铬钝化液中铁杂质的分析方法  

Method for analysis of iron impurity in a trivalent chromium passivation bath

作　　者：郭崇武[1] 黎小阳 陈媚[1] 

机构地区：[1]广州超邦化工有限公司,广东广州510460

出　　处：《电镀与涂饰》2018年第1期27-28,共2页Electroplating & Finishing

摘　　要：利用钛铁试剂(邻苯二酚-3,5-二磺酸钠)与三价铁离子在p H=10之下的特效显色反应,用分光光度法测定三价铬钝化液中铁杂质的质量浓度。以钝化液底色作为参比,用1 cm比色皿,在波长500 nm处测定显色溶液的吸光度。本法测定结果的相对平均偏差为0.58%,回收率为97.7%～100%,满足监控三价铬钝化液的要求。The mass concentration of iron impurity in a trivalent chromium passivation bath is analyzed by spectro- photometric method based on the specific color development reaction of disodium 1,2-dihydroxybenzene-3,5-disulfonate （also called Tiron） with Fe3＋ ions at pH 10. The absorbance of the chromogenic solution is determined using a 1 cm cuvette at a wavelength of 500 nm with the blank passivation bath as reference. The method has a relative average deviation of 0.58% and a recovery ranging from 97.7% to 100%, meeting the requirement of monitoring and control of trivalent chromium passivation bath.

关 键 词：三价铬钝化液 铁杂质 钛铁试剂 分光光度法 测定 

分 类 号：TG178[金属学及工艺—金属表面处理] O655.25[金属学及工艺—金属学]