Scanning Kelvin Probe was applied to study passivation of AISI 304L stainless steel after cathodic polarisation. The rate of passivation in air decreased as a function of duration and current density. X-ray Photoelectron Spectroscopy showed enrichment of the surface film by hydroxides of Fe (II) that was the result of hydrogen effusion from the bulk. SKP measured a decreased potential drop in the passive film. Pre-polarisation accelerates the crevice corrosion of steel in presence of chlorides. Using SKP mapping, increased hydrogen sub-surface concentration and lower level of passivity was observed in anodic zones of the crevice.

中文翻译：

---

扫描开尔文探针对氢气对AISI 304L钝化和缝隙腐蚀引发的影响

扫描开尔文探针用于研究阴极极化后AISI 304L不锈钢的钝化。空气中的钝化速率随持续时间和电流密度的变化而降低。X射线光电子能谱显示表面膜被Fe（II）的氢氧化物富集，这是从主体中散发氢的结果。SKP测量了钝化膜中电位下降的情况。预极化会在存在氯化物的情况下加速钢的缝隙腐蚀。使用SKP测绘，在缝隙的阳极区域观察到氢表面下浓度增加和钝化度降低。