Abstract
Corrosion behavior of three grades of duplex stainless steels in simulated paper machine white water was evaluated by cyclic potentiodynamic polarization, exposure test, and potentiostatic scratch test. More stable pits tend to form in less aggressive environment caused by sulfate addition. Presence of thiosulfate considerably lowers the repassivation potential. All three grades of duplex stainless steels performed better than S30403 in white water exposure test. For scratch tests, in presence of thiosulfate ion, three types of duplex stainless steels behaved differently. S31803 with the highest molybdenum content was the most corrosion resistant among the three duplex stainless steels tested.
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2014
Association for Materials Protection and Performance (AMPP)
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