Electrochemical dissolution behavior of Ti6Al4V alloy: Effect of microstructure and processing method

We report the electrochemical dissolution behavior of Ti-based alloys prepared by two different processing methods including laser solid foming (LSF) additive manufacturing and forging in a 15 wt % NaCl solution. The corrosion resistance of the forged Ti6Al4V alloy is slightly better than that of the LSFed state, and is ascribed to the dominant galvanic effect of fine α/β lamellae accelerating the corrosion dissolution rate of the LSFed sample. The size, morphology, and content of the α/β phase and Al segregation affect the anodic dissolution behavior by promoting/inhibiting the galvanic effect. The galvanic effect of duplex Ti-based alloys is the key factor determining the anodic dissolution performance and dissolved surface quality. The distinction in electrochemical dissolution behavior on Ti6Al4V alloy produced by LSF and forging provides a mechanism support on their difference of electrochemical machining machinability. •Effect of processing method on electrochemical dissolution performance of Ti6Al4V were revealed.•Fine basketwave microstructure has inferior corrosion resistance but better roughness than coarse equiaxed α phase.•Galvanic effect determines the corrosion resistance and dissolved surface quality of Ti6Al4V alloy.