The effect of pre-deformation on corrosion resistance of the passive film formed on 2205 duplex stainless steel

Effect of the prior cold work on the corrosion resistance of lean duplex stainless steel welded by GMAW process

“…However, for superficial non‐polished samples a nonlinear result was found, the cold work was beneficial in some cases while in other cases is harmful. Other woks, studying different DSS submitted to different degrees of deformation, found a decrease of the corrosion resistance with the increase of cold work …”

“…Other woks, studying different DSS submitted to different degrees of deformation, found a decrease of the corrosion resistance with the increase of cold work. [22,30] For samples with 50% thickness reduction, a decrease in corrosion resistance was observed, indicating that this level of deformation destabilizes the passive layer of UNS S32304 steel. For degrees of deformation exceeding 30% thickness reduction, the literature shows that the formation of straininduced martensite (SIM) is the main deformation mechanism.…”

“…Deformations caused by cold work in the material can have a significant effect on the properties of the passive film, affecting its electrochemical behavior and its resistance to generalized and pitting corrosion . Studies have shown that the impact of cold work in the material will depend on the nature of the residual stress (tensile or compressive), the magnitude of these tensions, the degree of cold work applied, and the corrosive medium to which it will be exposed …”

“…Ran et al found that the pitting potential of 19Cr lean duplex steel decreases with the reduction of steel thickness by cold working (0, 20, 40, 60, 80% reduction of thickness). Lv et al observed that the increased deformation applied to SAF2205 steel (5, 10, 15, and 25% of total strain) caused a decrease in corrosion potential and polarization resistance. Yang et al observed that plastic deformations of 5, 10, and 15% of total strain did not affect the pitting potential of the SAF2205 duplex steel but caused the increase of the passivation current with the increase of the degree of plastic deformation applied.…”

“…[25,26] Studies have shown that the impact of cold work in the material will depend on the nature of the residual stress (tensile or compressive), the magnitude of these tensions, the degree of cold work applied, and the corrosive medium to which it will be exposed. [22,25,26,[29][30][31] Some studies have evaluated the corrosion resistance of cold-worked DSS, with various levels of deformation, in saline solution at room temperature. Ran et al [22] found that the pitting potential of 19Cr lean duplex steel decreases with the reduction of steel thickness by cold working (0, 20, 40, 60, 80% reduction of thickness).…”