In this paper, the pitting failure boundary of duplex stainless steel under sour condition was investigated by electrochemical and immersion tests. Polarization measurements are employed to investigate the effect of temperature and H2S on the corrosion behavior of Duplex Stainless Steel. And the pitting susceptibility is estimated by the further analysis of polarization curves and surface characterization. The results show that the pitting resistance of S31803 duplex stainless steel decreases with the increase of temperature and the H2S partial pressure. S31803 duplex stainless steel is pitting sensitive at around 85°C in 50kPa H2S, 130,000ppm Cl− condition.

Subject
Immersion tests, Steel surfaces, Materials, Hysteresis loop, Partial pressures, Polarization curves, Corrosion morphology, Pitting, Immersion, Corrosion resistance, Duplex stainless steel, Stainless steel, Corrosion potential
Keywords:
Stainless steel, Pitting, Polarization curve, H2S, Immersion test
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2018
Association for Materials Protection and Performance (AMPP)
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