An XPS study of the passive and transpassive behavior of molybdenum in deaerated 0.1 M HCl

Y. C. Lu; C. R. Clayton

doi:10.1016/0010-938X(89)90085-1

An XPS study of the passive and transpassive behavior of molybdenum in deaerated 0.1 M HCl

Y. C. Lu
, C. R. Clayton

Materials Science and Engineering

Stony Brook University

Research output: Contribution to journal › Article › peer-review

125 Scopus citations

Abstract

Pure molybdenum was polarized in deaerated 0.1 M HCl solution at 22°C. Molybdenum was found to be passive in the range between -396 mV to +125 mV(SCE). Variable angle XPS was employed to detect the nature of passive and transpassive films formed at specified potentials on Mo. The passive film was found to be comprised of MoO₂ and MoO(OH)₂. In the early stage of passive film formation, lower valence species, probably MO₂O₃, were observed. In the lower potential range of the transpassive region, Mo₂O₃ was formed, which coincided with a loss of protection from MoO₂ and MoO(OH)₂, and the formation of a thick oxidation product. At higher potentials, in the transpassive range, the film was found to consist of trivalent, tetravalent, pentavalent and hexavalent species. HMoO₄ was detected in the anolyte of the transpassive region.

Original language	English
Pages (from-to)	927-937
Number of pages	11
Journal	Corrosion Science
Volume	29
Issue number	8
DOIs	https://doi.org/10.1016/0010-938X(89)90085-1
State	Published - 1989

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title = "An XPS study of the passive and transpassive behavior of molybdenum in deaerated 0.1 M HCl",

abstract = "Pure molybdenum was polarized in deaerated 0.1 M HCl solution at 22°C. Molybdenum was found to be passive in the range between -396 mV to +125 mV(SCE). Variable angle XPS was employed to detect the nature of passive and transpassive films formed at specified potentials on Mo. The passive film was found to be comprised of MoO2 and MoO(OH)2. In the early stage of passive film formation, lower valence species, probably MO2O3, were observed. In the lower potential range of the transpassive region, Mo2O3 was formed, which coincided with a loss of protection from MoO2 and MoO(OH)2, and the formation of a thick oxidation product. At higher potentials, in the transpassive range, the film was found to consist of trivalent, tetravalent, pentavalent and hexavalent species. HMoO4 was detected in the anolyte of the transpassive region.",

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T1 - An XPS study of the passive and transpassive behavior of molybdenum in deaerated 0.1 M HCl

AU - Lu, Y. C.

AU - Clayton, C. R.

PY - 1989

Y1 - 1989

N2 - Pure molybdenum was polarized in deaerated 0.1 M HCl solution at 22°C. Molybdenum was found to be passive in the range between -396 mV to +125 mV(SCE). Variable angle XPS was employed to detect the nature of passive and transpassive films formed at specified potentials on Mo. The passive film was found to be comprised of MoO2 and MoO(OH)2. In the early stage of passive film formation, lower valence species, probably MO2O3, were observed. In the lower potential range of the transpassive region, Mo2O3 was formed, which coincided with a loss of protection from MoO2 and MoO(OH)2, and the formation of a thick oxidation product. At higher potentials, in the transpassive range, the film was found to consist of trivalent, tetravalent, pentavalent and hexavalent species. HMoO4 was detected in the anolyte of the transpassive region.

AB - Pure molybdenum was polarized in deaerated 0.1 M HCl solution at 22°C. Molybdenum was found to be passive in the range between -396 mV to +125 mV(SCE). Variable angle XPS was employed to detect the nature of passive and transpassive films formed at specified potentials on Mo. The passive film was found to be comprised of MoO2 and MoO(OH)2. In the early stage of passive film formation, lower valence species, probably MO2O3, were observed. In the lower potential range of the transpassive region, Mo2O3 was formed, which coincided with a loss of protection from MoO2 and MoO(OH)2, and the formation of a thick oxidation product. At higher potentials, in the transpassive range, the film was found to consist of trivalent, tetravalent, pentavalent and hexavalent species. HMoO4 was detected in the anolyte of the transpassive region.

UR - https://www.scopus.com/pages/publications/0024913848

U2 - 10.1016/0010-938X(89)90085-1

DO - 10.1016/0010-938X(89)90085-1

M3 - Article

AN - SCOPUS:0024913848

SN - 0010-938X

VL - 29

SP - 927

EP - 937

JO - Corrosion Science

JF - Corrosion Science

IS - 8

ER -

An XPS study of the passive and transpassive behavior of molybdenum in deaerated 0.1 M HCl

Abstract

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