在弱碱性及中性介质中AISI304不锈钢载波钝化膜光电化学研究

A Photoelectrochemical Investigation of A.C.Modulated Passive Films on 304 Stainless Steel in Weak-alkaline and Neutral Solution

采用光电化学方法—恒电位光电流测量技术研究了ＡＩＳＩ３０４不锈钢在０．ｌｍｏｌ／ＬＮａ＿２Ｂ＿４Ｏ＿７及０．５ｍｏｌ／ＬＮａ＿２ＳＯ＿４介质中载波钝化膜，光电流测量结果表明：光电流大小与电极电势、成膜条件及测量介质有关．载波钝化膜基本上是高度无序的非晶态膜．

A photoelectrochemical investigation has been carried out on AISI 304 stainlesssteeI AV modulated passive film in 0.1mol/L Na_2B_4O_7 and 0.5 mol/L Na_2SO_4 solution.Photocurrentcurve depends on the potential、passive condition and testing solutions. The results of the measurementsindicate that the photoresponse is determined by the defects in the electronic structure of the films whenthe defects lead to localized states in the bandgap region. It is concluded that the passive film on AISI304 stainless steel is in a highly disordered amorphous state.