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Effects of molybdenum on the composition and nanoscale morphology of passivated austenitic stainless steel surfaces

Published on Jan 1, 2015in Faraday Discussions3.71
· DOI :10.1039/C4FD00231H
Vincent Maurice7
Estimated H-index: 7
(PSL Research University),
Hao Peng1
Estimated H-index: 1
(PSL Research University)
+ 3 AuthorsPhilippe Marcus8
Estimated H-index: 8
(PSL Research University)
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Abstract
Surface analysis by time-of-flight secondary ion mass spectrometry, X-ray photoelectron spectroscopy and scanning tunnelling microscopy has been applied to provide new insight on Mo effects on the composition and nanostructure of the passive films grown in sulfuric acid on well-controlled Fe–17Cr–14.5Ni–2.3Mo(100) austenitic stainless steel single crystal surfaces. A duplex hydroxylated oxide matrix, 1.8–1.9 nm thick, is formed with a strong partition between Cr(III) and Fe(III) in the inner and outer layers, respectively. Cr(III) is increasingly enriched by preferential iron oxide dissolution upon passivation and ageing. Ni, only present as oxide traces in the film, is enriched in the alloy underneath. Mo, mostly present as Mo(IV) in the Cr-rich inner layer prior to anodic polarisation, becomes increasingly enriched (up to 16% of cations) mostly as Mo(VI) in the Fe-rich outer layer of the passive film, with ageing promoting this effect. Metallic Mo is not significantly enriched below the passive film produced from the native oxide covered surface. Mo does not markedly impact the nanogranular morphology of the native oxide film nor its local thickness variations assigned to substrate site effects on Cr(III) enrichment. Site specific preferential passivation still takes place at the (native) oxide-covered step edges of the alloy surface, and transient dissolution remains preferentially located on the terraces. Nanostructures, possibly Mo-containing, and healing local depressions formed by transient dissolution during passivation, appear as a specific effect of the Mo presence. Another Mo effect, observed even after 20 h of passivation, is to prevent crystallisation at least in the Fe-rich outer part of the passive film where it is concentrated mostly as Mo(VI) (i.e. molybdate) species.
  • References (63)
  • Citations (21)
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References63
Newest
#1Toni Massoud (ENSCP: Chimie ParisTech)H-Index: 4
#2Vincent Maurice (ENSCP: Chimie ParisTech)H-Index: 39
Last.Philippe Marcus (ENSCP: Chimie ParisTech)H-Index: 55
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#1Toni Massoud (ENSCP: Chimie ParisTech)H-Index: 4
#2Vincent Maurice (ENSCP: Chimie ParisTech)H-Index: 39
Last.Philippe Marcus (ENSCP: Chimie ParisTech)H-Index: 55
view all 4 authors...
#1Antoine Seyeux (ENSCP: Chimie ParisTech)H-Index: 21
#2Vincent Maurice (ENSCP: Chimie ParisTech)H-Index: 39
Last.Philippe Marcus (ENSCP: Chimie ParisTech)H-Index: 55
view all 3 authors...
#1Philippe Marcus (ENSCP: Chimie ParisTech)H-Index: 55
#2Vincent Maurice (ENSCP: Chimie ParisTech)H-Index: 39
Last.H.-H. Strehblow (ENSCP: Chimie ParisTech)H-Index: 1
view all 3 authors...
Cited By21
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#1Li Ma (PSL Research University)
#2Frédéric Wiame (PSL Research University)H-Index: 4
Last.Philippe Marcus (PSL Research University)H-Index: 8
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#1Cem Örnek (KTH: Royal Institute of Technology)H-Index: 9
#2Christofer Leygraf (KTH: Royal Institute of Technology)H-Index: 43
Last.Jinshan Pan (KTH: Royal Institute of Technology)H-Index: 32
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#1Li Ma (PSL Research University)
#2Frédéric Wiame (PSL Research University)H-Index: 4
Last.Philippe Marcus (PSL Research University)H-Index: 8
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#1Jeffrey D. Henderson (UWO: University of Western Ontario)H-Index: 5
#2Antoine Seyeux (PSL Research University)H-Index: 21
Last.Philippe Marcus (PSL Research University)H-Index: 8
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#1Chunduo Dai (USTB: University of Science and Technology Beijing)H-Index: 1
#2Hong Luo (USTB: University of Science and Technology Beijing)
Last.Jizheng Yao (USTB: University of Science and Technology Beijing)H-Index: 5
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#1Jeffrey D. Henderson (UWO: University of Western Ontario)H-Index: 5
#2Xuejie Li (PSL Research University)H-Index: 1
Last.K. Ogle (PSL Research University)H-Index: 8
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