A quartz crystal microbalance study of the kinetics of interaction of benzotriazole with copper |
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Authors: | F M Al Kharafi A M Abdullah B G Ateya |
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Affiliation: | (1) Chemistry Department, Faculty of Science, University of Kuwait, P.O. Box 5969, Safat, 13060, Kuwait |
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Abstract: | The kinetics of interaction of benzotriazole (C6H5N3, BTAH) with the surface of copper in salt water were studied using an electrochemical quartz crystal microbalance and X-ray
photoelectron spectroscopy (XPS). Upon injecting BTAH into the electrolyte, three regions appear in the time response of the
microbalance. Region I (at short time of few minutes), exhibits rapid linear growth of mass with time, which is attributed
to the formation of a protective Cu(I)BTA complex. Region II reveals attachment of BTAH at a slower rate onto the inner Cu(I)BTA
complex. Region III is a plateau indicating that the BTAH film attains an equilibrium mass and thickness, which increase with
the concentration of BTAH. The intensity of the N1s peak in the XPS spectra increases with the time of immersion, indicating
more BTAH on the surface. The results suggest a duplex inhibitor film composed of an inner thin layer of Cu(I)BTA and an outer
layer of physically adsorbed BTAH which increases in thickness with time and BTAH concentration. They also offer an explanation
for the much documented findings of simultaneous increase of the polarization resistance and decrease of double layer capacity
with inhibitor concentration and time of immersion. |
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Keywords: | Benzotriazole Copper Corrosion inhibitor Duplex film Quartz crystal microbalance |
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