Influence of temperature and hydrostatic pressure on the galvanic corrosion between 90/10 Cu-Ni and AISI 316L stainless steel

The galvanic corrosion behavior of the 90/10 Cu-Ni alloy coupled to AISI 316L stainless steel, has been studied at different temperatures (5, 15 and 30 degrees C) and hydrostatic pressures (0.1, 10 and 20 MPa) by electrochemical and SEM methods. Results show that both the increasing temperature and hydrostatic pressure display an accelerating effect on the self-corrosion of 90/10 Cu-Ni. When coupled to AISI 316L stainless steel, 90/10 Cu-Ni alloy works as the anodic part. Galvanic corrosion current density increases with increasing temperature and decreases with increasing hydrostatic pressure. The independent effect of temperature and hydrostatic pressure on the galvanic corrosion process has been found. The effect of temperature on the galvanic corrosion process, which follows the Arrehenius equation, was found to be more influential than that of hydrostatic pressure. A potential relation concerning both the influence of the temperature and the hydrostatic pressure on the corrosion and galvanic corrosion current densities of 90/10 Cu-Ni has been set up. (C) 2021 The Authors. Published by Elsevier B.V.