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Revista de Chimie, Volume 70, Issue 7, pp. 2321-2324 (2019)
https://doi.org/10.37358/RC.19.7.7331

Ioana Maior, Gabriela Elena Badea, Anca Cojocaru, Anca Maria Cimbru, Simona Bungau, Laura Endres

Cr(VI) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium

Abstract:

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 have been studied by potentiostatic polarisation technique depending on the chromate concentration in solution. The kinetic parameters -Tafel slope, charge transfer coefficient and limiting current density -were evaluated comparatively. For the solutions containing £5 mM K2CrO4 the Tafel slopes are higher on stainless steel than on nickel (around -135 mV·dec-1 for nickel and -165 mV·dec-1 for stainless steel). Moreover, by increasing the chromate concentration the Tafel slopes increase on nickel and decrease on stainless steel. The low Tafel slope values of -75 mV·dec-1 obtained on stainless steel electrode in the potential region -0.5¸ -0.75V vs. SCE could be due to a decrease of the charge transfer process rate because of the presence of a physical barrier. The values for the reaction rates are slightly higher for nickel than for stainless steel electrodes on all the studied potential range. The reaction product is soluble trivalent chromium, excepting the solution with 500 mM K2CrO4, when a Cr(OH)3 film may cover the electrode surface that determines the decrease of the reaction rate.
Keywords:
Cr(VI) reduction; nickel; stainless steel; acid medium

Issue: 2019 Volume 70, Number 7
Pages: 2321-2324
https://doi.org/10.37358/RC.19.7.7331
download pdf   Download Pdf Article
Citation Styles
Cite this article as:
MAIOR, I., BADEA, G.E., COJOCARU, A., CIMBRU, A.M., BUNGAU, S., ENDRES, L., Rev.Chim., 70, no. 7, 2019, p. 2321

Vancouver
Maior I, Badea GE, Cojocaru A, Cimbru AM, Bungau S, Endres L. Cr(VI) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium. REV.CHIM.[internet]. 2019 Jul;70(7):2321-2324. Available from: https://doi.org/10.37358/RC.19.7.7331


APA 6th edition
Maior, I., Badea, G.E., Cojocaru, A., Cimbru, A.M., Bungau, S. & Endres, L. (2019). Cr(VI) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium. Revista de Chimie, 70(7), 2321-2324. https://doi.org/10.37358/RC.19.7.7331


Harvard
Maior, I., Badea, G.E., Cojocaru, A., Cimbru, A.M., Bungau, S., Endres, L. (2019). 'Cr(VI) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium', Revista de Chimie, 70(7), pp. 2321-2324. https://doi.org/10.37358/RC.19.7.7331


IEEE
I. Maior, G.E. Badea, A. Cojocaru, A.M. Cimbru, S. Bungau, L. Endres, "Cr(VI) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium". Revista de Chimie, vol. 70, no. 7, pp. 2321-2324, 2019. [online]. https://doi.org/10.37358/RC.19.7.7331


Text
Ioana Maior, Gabriela Elena Badea, Anca Cojocaru, Anca Maria Cimbru, Simona Bungau, Laura Endres,
Cr(VI) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium,
Revista de Chimie,
Volume 70, Issue 7,
2019,
Pages 2321-2324,
ISSN 2668-8212,
https://doi.org/10.37358/RC.19.7.7331.
(https://revistadechimie.ro/Articles.asp?ID=7331)
Keywords: Cr(VI) reduction; nickel; stainless steel; acid medium


RIS
TY - JOUR
T1 - Cr(VI) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium
A1 - Maior, Ioana
A2 - Badea, Gabriela Elena
A3 - Cojocaru, Anca
A4 - Cimbru, Anca Maria
A5 - Bungau, Simona
A6 - Endres, Laura
JF - Revista de Chimie
JO - Rev.Chim.
PB - Revista de Chimie SRL
SN - 2668-8212
Y1 - 2019
VL - 70
IS - 7
SP - 2321
EP - 2324
UR - https://doi.org/10.37358/RC.19.7.7331
KW - Cr(VI) reduction
KW - nickel
KW - stainless steel
KW - acid medium
ER -


BibTex
@article{RevCh2019P2321,
author = {Maior Ioana and Badea Gabriela Elena and Cojocaru Anca and Cimbru Anca Maria and Bungau Simona and Endres Laura},
title = {Cr(VI) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium},
journal = {Revista de Chimie},
volume = {70},
number = {7},
pages = {2321-2324},
year = {2019},
issn = {2668-8212},
doi = {https://doi.org/10.37358/RC.19.7.7331},
url = {https://revistadechimie.ro/Articles.asp?ID=7331}
}
 
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