Abstract
The corrosion mechanism of an AA2024-T3/Ti6Al4V galvanic couple model (electrodes’ area ratio =1) was investigated in NaCl media by means of Scanning Vibrating Electrode Technique (SVET), Zero Resistance Ammeter (ZRA), potentiodynamic polarisation and Open Circuit Potential (OCP) analysis. Galvanic coupling was not sufficiently intense to impact the self-corrosion process of AA2024 exposed to 0.01 M or 1 M NaCl solution. Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy (SEM–EDX) clearly demonstrated that trenching of the AA2024 matrix induced by its constituent inclusions was the main corrosion process concerning the couple. The highly stable passive layer of Ti6Al4V, which was shown to present a poor catalytic nature for oxygen reduction, was responsible for the limited extension of galvanic corrosion observed.
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