采用光电化学方法对纯铁在ｐＨ＝８．４的硼酸－硼砂缓冲液中的孔蚀现象及缓蚀剂ＰＣ－６０４的作用进行了研究。结果表明，加入不同量的缓蚀剂后，铁表面饨化膜的禁带宽度没有发生变化，但是光电流信号却随缓蚀剂量的增加而增大了。从光电流暂态谱的研究中首次提出了钝化膜的膜参数的概念，并用以衡量钝化膜的抗孔蚀能力。 Pitting corrosion of pure iron in boric acid-borax buffer solution with pH = 8.4 and the effect of corrosion inhibitor PC-604 were studied by using photoelectrochemical method. The results show that after adding different amounts of corrosion inhibitors, the band gap width of the film on the surface of the iron does not change, but the photocurrent signal increases with the increase of the amount of corrosion inhibitor. For the first time, the concept of film parameter of passivation film was proposed from the study of photocurrent transient spectroscopy and used to measure the anti-cavitation ability of passivation film.