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J Chin Soc Corr Pro  1983, Vol. 3 Issue (3): 139-150    DOI:
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AN XPS AND AES INVESTIGATION OF THE SURFACE FILMS ON Mo UNDER DIFFERENT POTENTIAL-pH CONDITIONS
Yang Wu Ni Ruicheng Hua Huizhong (Shanghai Research Institute of Materials)
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Abstract  X-ray photoelectron spectroscopy(XPS)and Auger electron spectroscopy (AES)techniques were employed for analyzing the surface films formed on Mo in various solutions and under different potential-pH conditions.The measurement results show:1)The passive film of Mo formed at lower poten- tials is an oxide or hydrated oxide with a lower valence(most probably tetra- valence),which is stable in the solutions free from oxygen.This film is extre- mely thin but excellently protective;2)The stable substance in the surface films formed in the transpassive region at higher potentials is molybdic anhy- dride MoO_3;3)The surface films formed in FeCl_2 solutions in the second passive region at higher potentials contain an outer layer of Fe_2O_3 and an inner layer possibly composed of ferrous molybdate.The AES and XPS results substantiate the validity of the previously presented potential-pH equili- brium diagram for the Mo-H_2O system and mechanism of the effect of Mo on the propagation of localized corrosion of steels.
Received:  25 June 1983     
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Yang Wu Ni Ruicheng Hua Huizhong (Shanghai Research Institute of Materials). AN XPS AND AES INVESTIGATION OF THE SURFACE FILMS ON Mo UNDER DIFFERENT POTENTIAL-pH CONDITIONS. J Chin Soc Corr Pro, 1983, 3(3): 139-150.

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