Abstract
The fundamental kinetic parameters of corrosion product ions (Fe, Ni and Cr ions) are of significant importance to understand the corrosion mechanisms of the structural materials in the molten salts. In the present study, the fundamental data of Fe2+, Ni2+, Cr2+ and Cr3+ (diffusion coefficient D, exchange current density i
0, charge transfer coefficient α, limiting current density i
L
and standard rate constant k
0) were measured at different concentrations (1.53 × 10−6−7.48 × 10−4 mol cm−3) and temperatures (600 °C–800 °C). The values of D are independent of concentrations and follow Arrhenius law with temperature, which descend in the order of
D
C
r
2
+
>
D
F
e
2
+
>
D
C
r
3
+
>
D
N
i
2
+
,
with values ranging from 0.94 × 10−5 to 3.31 × 10−5 cm2 s−1. Both i
0 and k
0 depend on the temperatures, which also follow Arrhenius law. The values of the estimated k
0 descend in the order of
k
C
r
2
+
0
>
k
F
e
2
+
0
>
k
N
i
2
+
0
>
k
C
r
3
+
0
,
which range from 1.88 × 10−5 to 9.06 × 10−4 cm s−1.
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
13 articles.
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