Correlation of hydrogen-facilitated pitting of AISI 304 stainless steel to semiconductivity of passive films

XPS Analysis of Passive Film on Stainless Steel

“…The nature of the semi conducting passive film changes on polarization [31]. Changes in double layer capacitances with acid concentration and anodic potentials suggest that the transition occurs from n-type to p-type conductivity [36]. Photo electrochemical studies in 0.05M H 2 SO 4 revealed that the protective property of the film depends on chromium content in the alloy [37][38][39].…”

Photo-electrochemical analysis of passive film formed on X80 pipeline steel in bicarbonate/carbonate buffer solution

“…Many researches have been investigated the properties of the passive film formed on iron, stainless steel, chromium and other metals [3][4][5][6][7][8][9]. According to Cheng [10], the passive film formed on A516-70 carbon steel in chromate solution shows characteristics of an amorphous n-type semiconductor with a 10 26 to 10 27 m À3 value of the donor density.…”

Hydrogen-enhanced Surface Reactivity of X80 Pipeline Steel observed by Scanning Electrochemical Microscopy

“…Dissolved hydrogen in metals was proven to increase the dissolution rates of alloys in both the passive and transpassive regions by hindering chromium enrichment in surface films 3 and to induce stress corrosion cracking and pitting corrosion. 4,5 Incorporation of hydrogen into the passive film would alter the semiconductivity of the passive layer on AISI 310 stainless steel. 6 In order to fully understand the hydrogen effect on the properties of passive film, various techniques are needed, including surface analysis methods like secondary ion mass spectroscopy (SIMS), 7,8 X-ray photoelectron spectroscopy (XPS), 7 as well as electrochemical methods like electrochemical impedance spectroscopy (EIS), 9,10 electrochemical noise.…”