Corrosion Behaviour of Copper in LiBr Solutions: Effect of Temperature
A. E. El Meleigy
Department of Electrochemistry and Corrosion, National Research Centre, Dokki, Giza, Egypt.
Sh. E. Abd Elhamid
Department of Electrochemistry and Corrosion, National Research Centre, Dokki, Giza, Egypt.
A. A. El Warraky *
Department of Electrochemistry and Corrosion, National Research Centre, Dokki, Giza, Egypt.
*Author to whom correspondence should be addressed.
Abstract
The temperature effect of 25, 50, 70 and 80ºC on the dissolution of copper in different concentrations of Lithium Bromide (LiBr) from 3x10-2 to 9M was investigated. Three types of corrosion have been detected: General dissolution due to the formation of soluble complex of CuBr2- between the two anodic peaks (P1 and P2) of the first and second electro-oxidation process; pitting corrosion which occurs after the formation of P2 and the second type of general corrosion form due to autocatalytic dissolution of Cu+. A new type of pitting corrosion known as metastable pitting which depends on temperature and concentration has been detected.
Keywords: Copper, LiBr, temperature, pitting corrosion and metastable pitting