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51312-01319-Electrochemical Behavior of Passive Film Formed on Ni-Cr-Mo Alloy 625 in Neutral Sodium Chloride Sol

Picture for Electrochemical Behavior of Passive Film Formed on Ni-Cr-Mo Alloy 625 in Neutral Sodium Chloride Sol
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Product Number: 51312-01319-SG
ISBN: 01319 2012 CP
Author: Navid Attarzadeh
Publication Date: 2012
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The present work investigates the electrochemical behavior of passive film formed on Ni-Cr-Mo alloy 625 in potentials ranging from -100 to 700 mVSCE using various techniques including potentiodynamic polarization potentiostatic polarization Electrochemical Impedance Spectroscopy (EIS) and Mott-Schottky (M-S) analysis in neutral 3.5 wt.% NaCl solution. These comprehensive studies show that the passive film properties might be divided into two potential regions which the manifestation of Region ? likely lasts 200 mVSCE and Region ?? dominates at higher potentials. For Region ? where the passive film represents n-type semiconductivity the passive current-transient is independent of formation potentials while the total film resistance changes incrementally. However the passive film represents p-type semiconductivity in Region ?? where the passive current-transient is found to be an increasing function of formation potential. In addition the point defect model (PDM) in conjunction with the results was used to elucidate the corrosion performance mechanism over the two potential regions. These findings are at odds with chloride-catalyzed film dissolution and chloride penetration mechanism for passivity breakdown. Meanwhile they entirely emphasize the postulate of the PDM envisaging cation vacancy generation at the barrier layer/outer layer interface and subsequent cation vacancy condensation at the metal/barrier layer interface.
The present work investigates the electrochemical behavior of passive film formed on Ni-Cr-Mo alloy 625 in potentials ranging from -100 to 700 mVSCE using various techniques including potentiodynamic polarization potentiostatic polarization Electrochemical Impedance Spectroscopy (EIS) and Mott-Schottky (M-S) analysis in neutral 3.5 wt.% NaCl solution. These comprehensive studies show that the passive film properties might be divided into two potential regions which the manifestation of Region ? likely lasts 200 mVSCE and Region ?? dominates at higher potentials. For Region ? where the passive film represents n-type semiconductivity the passive current-transient is independent of formation potentials while the total film resistance changes incrementally. However the passive film represents p-type semiconductivity in Region ?? where the passive current-transient is found to be an increasing function of formation potential. In addition the point defect model (PDM) in conjunction with the results was used to elucidate the corrosion performance mechanism over the two potential regions. These findings are at odds with chloride-catalyzed film dissolution and chloride penetration mechanism for passivity breakdown. Meanwhile they entirely emphasize the postulate of the PDM envisaging cation vacancy generation at the barrier layer/outer layer interface and subsequent cation vacancy condensation at the metal/barrier layer interface.
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02213 THE INFLUENCE OF ENVIRONMENTAL FACTORS ON THE CREVICE CORROSION OF ALLOY 625 IN NATURAL SEAWATER

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Picture for Corrosion of Nickel Alloys in Elevated Temperature Sour Gas Environments
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Corrosion of Nickel Alloys in Elevated Temperature Sour Gas Environments

Product Number: 51317--9135-SG
ISBN: 9135 2017 CP
Author: Robert Rettew
Publication Date: 2017
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Test results for four alloys in six different sour environments are presented. Alloys 625, 825, 316L and carbon steel were testing in sour gas with varying exposure to moisture at 280°C. Corrosion rates for each alloy over a 30 day period are measured from mass and thickness changes.
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