Abstract
The corrosion behavior of AISI 410 stainless steel was investigated in relatively dilute HCl solutions with different concentrations and temperature levels. General corrosion occurred at pH<1.5 while pitting occurred at 2.25≤pH≤4.25. Important pitting parameters were evaluated as a function of both temperature and HCl concentration. Critical temperature (Tcrit) increased linearly with pH. Below Tcrit, passive film remained largely intact and sporadic metastable pitting initiated from non-metallic inclusions. Above Tcrit, passivity was completely destroyed and black film consisting of oxy-hydroxide and hydrated oxide formed. Sigma-phase particles were found in this steel and remained un-corroded.
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