In situ XANES study of the passive film formed on iron in borate buffer and in sodium acetate
Conference
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OSTI ID:475596
- and others
The passive film formed on Fe in pH 8.4 borate buffer (0. 1 36 M) over a broad potential range was characterized by in situ XANES (x-ray absorption near edge structure). On stepping the potential to a value between -0.6 V and +0.4 V (MSE), a passive film forms without detectable dissolution. The edge position indicates that the valence state of Fe in the film is 10 {+-} 5% Fe{sup 2+} and 90 {+-} 5% Fe{sup 3+}. Formation of a passive film at potentials between -0.8 V and -0.65 V is associated with dissolution prior to passivation, and a lower average valence state of 17 {+-} 5% Fe{sup 2+} and 83 {+-} 5% Fe{sup 3+}. At -0.9 V, the Fe did not passivate. The passive film that forms in pH 8.2 sodium acetate (0.1 M) at +0.4 V gives an edge similar to the high potential passive film formed in borate buffer, but dissolution occurs prior to passivation.
- Research Organization:
- Brookhaven National Lab., Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 475596
- Report Number(s):
- BNL--63484; CONF-961040--27; ON: DE97006106
- Country of Publication:
- United States
- Language:
- English
Similar Records
In situ X-ray absorption near edge structure study of the potential dependence of the formation of the passive film on iron in borate buffer
CATHODIC REDUCTION OF PASSIVE FILMS ON IRON IN BORATE AND PHOSPHATE BUFFER PH 8.4: DIFFERENT MECHANISMS REVEALED BY IN SITU TECHNIQUES.
CATHODIC REDUCTION OF PASSIVE FILMS ON IRON IN BORATE AND PHOSPHATE BUFFER PH 8.4: DIFFERENT MECHANISMS REVEALED BY IN SITU TECHNIQUES.
Journal Article
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Tue Jul 01 00:00:00 EDT 1997
· Journal of the Electrochemical Society
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OSTI ID:533118
CATHODIC REDUCTION OF PASSIVE FILMS ON IRON IN BORATE AND PHOSPHATE BUFFER PH 8.4: DIFFERENT MECHANISMS REVEALED BY IN SITU TECHNIQUES.
Conference
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Sat Mar 24 23:00:00 EST 2001
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OSTI ID:782048
CATHODIC REDUCTION OF PASSIVE FILMS ON IRON IN BORATE AND PHOSPHATE BUFFER PH 8.4: DIFFERENT MECHANISMS REVEALED BY IN SITU TECHNIQUES.
Conference
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Sat Mar 24 23:00:00 EST 2001
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OSTI ID:780779