TY - JOUR
T1 - Understanding multi-element alloy passivation in acidic solutions using operando methods
AU - Lutton, Katie
AU - Gusieva, Kateryna
AU - Ott, Noemie
AU - Birbilis, Nick
AU - Scully, John R.
N1 - Publisher Copyright:
© 2017
PY - 2017/7
Y1 - 2017/7
N2 - The kinetics of passivation and dissolution of many corrosion resistant engineering alloys remain incompletely characterized. Clarification of such kinetics and the unique role of alloying elements were investigated upon Ni-22% Cr and Ni-22% Cr-6% Mo, wt%, in an acidic chloride-free sulfate environment using simultaneous electrochemistry, on-line Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS), and Single Frequency-Electrochemical Impedance Spectroscopy (SF-EIS). The combination of methods enabled in-operando tracking of the total current densities for (i) oxidation, (ii) cation ejection by multiple paths, and (iii) oxide film growth during non-steady state passivation. An improved and physically accurate interpretation of passivation processes is presented and clarifies and alters the frequently made assumption that Cr2O3 is the dominant oxide on Ni-Cr alloys throughout oxidation.
AB - The kinetics of passivation and dissolution of many corrosion resistant engineering alloys remain incompletely characterized. Clarification of such kinetics and the unique role of alloying elements were investigated upon Ni-22% Cr and Ni-22% Cr-6% Mo, wt%, in an acidic chloride-free sulfate environment using simultaneous electrochemistry, on-line Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS), and Single Frequency-Electrochemical Impedance Spectroscopy (SF-EIS). The combination of methods enabled in-operando tracking of the total current densities for (i) oxidation, (ii) cation ejection by multiple paths, and (iii) oxide film growth during non-steady state passivation. An improved and physically accurate interpretation of passivation processes is presented and clarifies and alters the frequently made assumption that Cr2O3 is the dominant oxide on Ni-Cr alloys throughout oxidation.
KW - Nickel-chromium alloys
KW - Operando
KW - Passivation
KW - Selective dissolution
KW - Single-frequency electrochemical impedance
KW - Spectroelectrochemistry
UR - http://www.scopus.com/inward/record.url?scp=85019960138&partnerID=8YFLogxK
U2 - 10.1016/j.elecom.2017.05.015
DO - 10.1016/j.elecom.2017.05.015
M3 - Article
SN - 1388-2481
VL - 80
SP - 44
EP - 47
JO - Electrochemistry Communications
JF - Electrochemistry Communications
ER -