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The corrosion of copper in ethylene glycol-water mixtures containing chloride ions
Journal article   Peer reviewed

The corrosion of copper in ethylene glycol-water mixtures containing chloride ions

P.M. May, I.M. Ritchie and E.T. Tan
Journal of Applied Electrochemistry, Vol.21(4), pp.358-364
1991
DOI: https://doi.org/10.1007/BF01020222
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Abstract

The anodic oxidation of copper at 25°C in 50% (w/w) ethylene glycol-water and in aqueous solutions has been studied by linear sweep voltammetry. The effect of chloride concentration at pH 0 and 3 has been explored. The results in both solvents follow a similar pattern. At pH 0 and in the absence of chloride, only one anodic peak is observed corresponding to the dissolution of copper metal as copper(II) ions. At intermediate chloride concentrations (0.01-0.03 M), two additional peaks are detected which have been attributed to the following reactions: {Mathematical expression} When the chloride concentration is increased further, the three peaks gradually collapse back into one, corresponding to the dissolution of copper as a copper(I) chloro-complex. An additional peak appears at pH 3 which has been ascribed to the formation of copper(I) oxide. The results have been interpreted using E-pCl diagrams determined for the copper-chloride system in both 50% ethylene glycol-water and aqueous solutions. Further information has been obtained from rotating disc measurements and from microscopy. The relevance of these results to corrosion in automotive cooling systems is discussed.

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Citation topics
2 Chemistry
2.210 Corrosion & Deposition Chemistry
2.210.137 Corrosion Inhibition
Web Of Science research areas
Electrochemistry
ESI research areas
Chemistry
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