shows the copper corrosion rate, expressed as mg m−2 per day (mmd), versus temperature in a H2SO4 acid solution. In general, copper dissolution increases as the sulphuric acid concentration is raised from 0.001 to 1.0 M and as the temperature increases from 298 to 328 K. The copper corrosion rate is in the range from 1.7×103 to 4.4×103 mmd. At a low sulphuric acid concentration it has already been well established that copper dissolution is the main process [15]. For the highest sulphuric acid concentration (1.0 M) and the lowest temperature tested (298 K), a passivation phenomenon may take place on the copper surface, yielding the lowest corrosion rate (1.7×103 mmd). In the literature copper passivation phenomena originated by H2SO4 acid at a concentration of 1.0 M has been attributed to the formation of CuSO4 · 5H2O and/or Cu2O [16]. The passivating film consisted of an inner layer of a mixture of copper oxides and an outer layer of copper sulphate hydrate [17].