ISSN:
0003-5599
Source:
Emerald Fulltext Archive Database 1994-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1108/00035590210419335
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