Electrochemical behavior of additive manufactured TC4 alloy in different concentrated NaCl solutions

The corrosion behavior and transpassive dissolution properties of TC4 alloy produced by additive manufacturing technology via the laser cladding deposition method were investigated in static NaCl solutions with concentrations of 3.5, 10, and 15 wt%. The corrosion resistance exhibited nonlinear characteristics with respect to the various NaCl concentrations, but the passive film formed on the surface decreased with increasing NaCl concentrations. Simultaneously, transpassive dissolution properties and morphologies were evidently affected by the concentration of NaCl. The mechanism of the anodic dissolution behavior and film evolution under different Cl− concentrations were discussed based on the relevant electrochemical tests and point defects model.Graphical abstract