采用光电化学方法研究了模拟冷却水中硫离子对不锈钢钝化膜的破坏作用.结果表明，不锈钢钝化膜显示n-型光响应，最大吸收峰出现在310nm处。不锈钢钝化膜在电位约-0.35V开始出现光电流，随电位升高，光电流增大。钝化膜禁带宽度Eg随电位的升高而减小，并逐渐向铁氧化物的Eg靠近。模拟冷却水中加入硫离子使不锈钢钝化膜的光电流增大，Eg减小。硫离子的浓度越大，测得的光电流越大，而Eg越小，这可归因于钝化膜膜电阻的降低及钝化膜中氧化铬含量的减少。
The photoelectrochemical measurement of stainless steel in simulated cooling water shows that, the passive film on the stainless steel exhibits n-type photoresponse, and the peak of absorption happens at 310nm. The passive film on stainless steel starts to generate photocurrent at potential about -0.35V. As the potential rises, the photocurrent increases, and the bandgap energy Eg of the passive film fall. The addition of sulfide in the simulated cooling water can increase the photocurrent, and reduce the Eg values of the passive film on stainless steel. The greater the concentration of the sulfide is, the larger the measured photocurrent and the lower will be the Eg. That is attributable to the fall of the film resistance of the passive film and the decrease of content of chromium oxides in the passive film.
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