Comparison between open circuit and imposed potential measurements to evaluate the effect of temperature on galvanic corrosion of the pair alloy 31-welded alloy 31 in LiBr solutions

Galvanic corrosion between alloy 31 and welded alloy 31 has been studied under open circuit conditions using a zero-resistance ammeter (ZRA) in highly concentrated LiBr solutions at different temperatures. These results have been compared with results estimated from the polarization curves according to the mixed potential theory (imposed potential measurements). Results showed that the imposed potential measurements provided lower galvanic potentials and higher galvanic current densities than those obtained using open circuit measurements. The effect of temperature on the galvanic corrosion estimated using both techniques showed good agreement, since temperature increased the galvanic current density of the pair in both cases. (C) 2008 Elsevier Ltd. All rights reserved.