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.