Corrosion Performance of 201 low-Nickel Stainless Steel Anchor in Cl^- Contaminated Underground Water with Various Concentrations of SO₄ ^2- and HCO₃ ^-

Corrosion behavior of 201 low-nickel stainless steel was studied in Cl--contaminated underground water with various concentrations of HCO3 (-) and SO4 (2-) at different pHs to investigate the durability of stainless-steel anchors. The charge-transfer resistance increased, whereas the carrier densities and corrosion current density decreased with an increase in concentration of HCO3 (-) and SO4 (2-), and solution pH. A parameter that was termed the composite corrosiveness index (CCI) was proposed to assess the corrosivity of underground waters to stainless steels. The CCI exhibited a monotonic relationship with charge-transfer resistance, carrier density, and corrosion current density, and it was more suitable for stainless steels compared with previous corrosiveness indexes in underground waters.