IOANA MAIOR, GABRIELA ELENA BADEA
The reduction of Cr(VI) ion in 0.5 M H2SO4 deaerated solutions with different concentrations of K2CrO4 on nickel and 18Cr-10Ni stainless steel electrodes has been studied using the potentiostatic polarization technique, analyzing the effects of chromate concentration. Kinetic parameters including Tafel slope, charge transfer coefficient, and limiting current density have been evaluated. The research found that for solutions containing ≤5 mM K2CrO4, Tafel slopes were higher on stainless steel than on nickel (approximately -135 mV·dec-1 for nickel compared to -165 mV·dec-1 for stainless steel). Moreover, an increase in chromate concentration affected the Tafel slopes differently; they increased on nickel while they decreased on stainless steel. Notably, low Tafel slope values of -75 mV·dec-1 on stainless steel in the potential region -0.5 to -0.75V vs. SCE indicated a decrease in charge transfer process rate due to the presence of a physical barrier. This study revealed that reaction rates were consistently higher for nickel than for stainless steel across all investigated potential ranges. The primary reaction product was soluble trivalent chromium, except in the case of 500 mM K2CrO4, where a Cr(OH)3 film formed, decreasing the reaction rate.
@article{0b3a7794-2d9f-4efd-804f-cb69fb3d201e,
title={Cr(V I) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium},
author={IOANA MAIOR and GABRIELA ELENA BADEA},
year={2019},
language={en}
}TY - JOUR TI - Cr(V I) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium AU - IOANA MAIOR AU - GABRIELA ELENA BADEA PY - 2019 LA - en ER -
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