Electrochemical impedance spectroscopy (EIS) was utilized to delve into the corrosion inhibition of eutectic Cu-Ag alloy and its components (Cu and Ag) in an aqueous, aerated 0.1 M KNO3 solution. This alloy plays a major role in the water cooling of central processing units in data storage centers. Two organic inhibitors, namely, 1,2,3-benzotriazole (BTA) and 2,5-dimercapto-1,3,4-thiadiazole (DMTD), were utilized in this study. The corrosion inhibition slowly evolved over time as diagnosed by an increase in the charge transfer impedance and the gradual tendency of the Nyquist profiles to arc toward the real axis. This trend was attributed to the gradual formation of organometallic passivation layers. The EIS data underlined the specific affinity of BTA and DMTD toward the Cu and Ag surfaces, respectively. A transition of the double-layer equivalent circuit element from ideal capacitance to a constant phase element was observed for the alloy compared to the pure metals. This was attributed to the heterogeneity induced by Cu-rich and Ag-rich phases in the alloy and by the formed oxides/protective film on the alloy surface. The EIS study demonstrated that both BTA and DMTD can provide sufficient corrosion inhibition to Cu-60Ag alloy with DMTD being significantly more effective.
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1 August 2023
Research Article|
May 20 2023
Temporal Aspects of Corrosion Inhibition on Copper, Silver, and Copper-Silver Alloys: An Electrochemical Impedance Spectroscopy Study
Hooman Rahmani
;
Hooman Rahmani
*Department of Materials Science and Engineering, The University of Texas at Arlington, Arlington, Texas 76019.
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Neil Spinner;
Neil Spinner
**Pine Research Instrumentation, Inc., 2741 Campus Walk Ave, Building 100, Durham, North Carolina 27705.
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Efstathios I. Meletis
Efstathios I. Meletis
‡
*Department of Materials Science and Engineering, The University of Texas at Arlington, Arlington, Texas 76019.
‡Corresponding author. E-mail: [email protected].
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‡Corresponding author. E-mail: [email protected].
Online ISSN: 1938-159X
Print ISSN: 0010-9312
© 2023, AMPP
2023
CORROSION (2023) 79 (8): 881–890.
Citation
Hooman Rahmani, Neil Spinner, Efstathios I. Meletis; Temporal Aspects of Corrosion Inhibition on Copper, Silver, and Copper-Silver Alloys: An Electrochemical Impedance Spectroscopy Study. CORROSION 1 August 2023; 79 (8): 881–890. https://doi.org/10.5006/4269
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