表面活性剂对镍和铁的缓蚀作用

EFFECT OF SURFACTANTS ON THE PROTECTING CORROSION FOR Ni AND Fe

表面活性剂十六烷基三甲基溴化铵（ＣＴＡＢ）、十二烷基硫酸钠（ＳＤＳ）、聚乙二醇辛基苯基醚（ＴｒｉｔｏｎＸ－１００）对Ｎｉ、Ｆｅ均有缓蚀作用，其缓蚀效率顺序为：ＣＴＡＢ＞ＴｒｉｔｏｎＸ－１００＞ＳＤＳ．ＨＣｌ溶液对这３种典型表面活性剂第一临界胶束浓度均有影响，在１．０ｍｏｌＬ－１ＨＣｌ溶液中，ＣＴＡＢ，ＳＤＳ，ＴｒｉｔｏｎＸ－１００的第一临界胶束浓度分别为１．３×１０－５，１．６×１０－５，１．０×１０－５ｍｏｌＬ－１．

Three surfactants can protect the corrosion for Ni and Fe. The order of efficiency of the protecting corrosion is CTAB>Triton X 100>SDS. The relationship of the efficiency with HCl concentration shows the effect of HCl on the critic micellar concentration of the surfactants. The first critic micellar concentration of CTAB, SDS and Triton X 100 is 1.3×10 -5 , 1.6×10 -5 , 1.0×10 -5 mol·L -1 in 1.0 mol·L -1 HCl, respectively.