Abstract
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.
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