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Corrosion inhibition of copper in 3 per cent NaCl solution by new bipyrazolic derivatives

A. Dafali (A. Dafali is at the Laboratoire de Chimie des Eaux et Corrosion, Faculté des Sciences, Oujda Morocco)
B. Hammouti (B. Hammouti is at the Laboratoire de Chimie des Eaux et Corrosion, Faculté des Sciences, Oujda Morocco)
R. Touzani (R. Touzani is at the Laboratoire de Chimie Organique Physique, Faculté des Sciences, Oujda Morocco)
S. Kertit (S. Kertit is at the Laboratoire de Physico‐Chimie des Matériaux associé à l'AUPELF UREF (LAF 502), Ecole Normale Supérieure de Takaddoum, Rabat, Morocco)
A. Ramdani (A. Ramdani is at the Laboratoire de Chimie Organique Physique, Faculté des Sciences, Oujda Morocco)
K. El Kacemi (K. El Kacemi is at the Laboratoire d'Electrochimie et de Chimie Analytique, Faculté des Sciences, Rabat, Morocco).)
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Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 1 April 2002

Abstract

The inhibition of the copper corrosion in aerated 3 per cent sodium chloride solution was studied by using electrochemical polarisation, weight loss and impedance measurements in the presence of different concentration of synthesised bipyrazolic compounds: N,N‐bis (3,5‐dimethylpyrazol‐1‐ylmethyl) butylamine (bipy1); N,N‐bis (3,5‐dimethylpyrazol‐1‐ylmethyl) allylamine (bipy2); N,N‐bis (3,5‐dimethylpyrazol‐1‐ylmethyl) ethanolamine. (bipy3); N,N‐bis (3,5‐dimethylpyrazol‐1‐ylmethyl) cyclohexylamine (bipy4); N,N‐bis (3‐carbomethoxy‐5‐methylpyrazol‐1‐ylmethyl) cyclohexylamine (bipy5); N,N‐bis(3‐carboethoxy‐5‐methylpyrazol‐1‐ylmethyl) cyclohexylamine (bipy6). The inhibition efficiencies obtained from cathodic Tafel plots, polarisation resistance and weight loss are in good agreement with electrochemical impedance spectroscopy (EIS) measurements. All these additives were found to be excellent inhibitors of copper corrosion. The difference in inhibition efficiencies of these inhibitors was not big, but the optimum concentration for maximum efficiency was slightly dependent on the substitution of each molecule. The studied molecules act as mixed‐type inhibitors. Detailed study of bipy1 shows that the maximum inhibition efficiency revolves around 99 per cent from 5×10−4 M of inhibitor. This latter adsorbs on the copper surface according to the Frumkin isotherm model. The inhibition efficiency of bipy1 decreases with the rise of temperature in the range 25 – 60°C.

Keywords

Citation

Dafali, A., Hammouti, B., Touzani, R., Kertit, S., Ramdani, A. and El Kacemi, K. (2002), "Corrosion inhibition of copper in 3 per cent NaCl solution by new bipyrazolic derivatives", Anti-Corrosion Methods and Materials, Vol. 49 No. 2, pp. 96-104. https://doi.org/10.1108/00035590210419335

Publisher

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MCB UP Ltd

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