The ability of fluoride ions, in trace concentrations, to promote film instability and transpassive dissolution was shown for several corrosion-resistant alloys. While the addition of fluoride ion was found to decrease the transpassive dissolution potential by approximately 0.1 V, the decrease was particularly pronounced in mildly acidic media (pH 5). Results suggest that the decreased potential range of stability for the heavily-relied-upon Cr(III)-rich oxide film is a concern in the presence of oxidizing impurities, which may push the corrosion potentials toward the transpassive region. The decreased potential range of passive film stability was observed using both dynamic and static polarization experiments and was supported by solution and surface analyses.
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1 May 2021
Research Article|
February 16 2021
Investigating the Corrosion Behavior of Corrosion-Resistant Alloys in Solutions Containing Dilute Fluoride Ions
J.D. Henderson;
J.D. Henderson
*Department of Chemistry, Western University, London, Ontario, N6A 5B7, Canada.
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S. Ramamurthy;
S. Ramamurthy
**Surface Science Western, Western University, London, Ontario, N6G 0J3, Canada.
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F.P. Filice;
F.P. Filice
*Department of Chemistry, Western University, London, Ontario, N6A 5B7, Canada.
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M.C. Biesinger;
M.C. Biesinger
*Department of Chemistry, Western University, London, Ontario, N6A 5B7, Canada.
**Surface Science Western, Western University, London, Ontario, N6G 0J3, Canada.
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D.W. Shoesmith;
D.W. Shoesmith
*Department of Chemistry, Western University, London, Ontario, N6A 5B7, Canada.
**Surface Science Western, Western University, London, Ontario, N6G 0J3, Canada.
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G.B. McGarvey;
G.B. McGarvey
***Sarnia Technology Applications & Research, Imperial Oil, Sarnia, Ontario, N7T 8C8, Canada.
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J.J. Noël
J.J. Noël
‡
*Department of Chemistry, Western University, London, Ontario, N6A 5B7, Canada.
**Surface Science Western, Western University, London, Ontario, N6G 0J3, Canada.
‡Corresponding author. E-mail: [email protected].
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CORROSION (2021) 77 (5): 540–551.
Citation
J.D. Henderson, S. Ramamurthy, F.P. Filice, M.C. Biesinger, D.W. Shoesmith, G.B. McGarvey, J.J. Noël; Investigating the Corrosion Behavior of Corrosion-Resistant Alloys in Solutions Containing Dilute Fluoride Ions. CORROSION 1 May 2021; 77 (5): 540–551. doi: https://doi.org/10.5006/3736
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