Abstract
The corrosion resistance of 2101 lean duplex stainless steel and 410 martensitic stainless steel were studied and compared in 1M – 6M H2SO4 solution by coupon measurement for application in extreme process environments. Data obtained showed 2101 duplex steel is significantly more resistant to corrosion at lower concentrations (1M and 2 M H2SO4 solution) of the acid solution with final corrosion rate values of 0.000010 mm/y and 0.00028 mm/y compared to the values obtained for 410 martensitic steel at 0.0019 mm/y and 0.0738 mm/y. H2SO4 concentration at 4M - 6M narrowed the margin between the corrosion rates of both steel with final values of 0.0235 mm/y, 0.0326 mm/y and 0.0459 mm/y for 2101 duplex steel, and 0.0479 mm/y, 0.0482 mm/y and 0.0511 mm/y for 410 martensitic steel which signifies the corrosion resistance of both steels are comparable and generally similar at higher concentrations of SO4 2− anions. Statistical analysis through analysis of variance shows H2SO4 concentration strongly influence the corrosion rate value of both steel compared to exposure time which has limited influence.
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