Influence of Deleterious Phases Precipitation in the Corrosion Resistance Measured by Double Loop Electrochemical Polarization Reactivation Test in Superduplex Stainless Steel

Materials Research

Juan Manuel Pardal¹  Sérgio Souto Maior Tavares¹  Guttemberg Chagas De Souza¹  Maria Da Penha Cindra Fonseca¹  Eduardo Ariel Ponzio¹  Marcelo Camargo Severo De Macedo¹ 

关键词: superduplex stainless steel;    deleterious phases precipitation;    corrosion resistance;    DL-EPR tests;   

DOI  :  10.1590/1516-1439.001614

来源: SciELO

【 摘 要 】

This work investigates the influence of deleterious phases precipitation on the corrosion resistance of two wrought superduplex stainless steels UNS S32750 with similar composition, but different grain sizes. Isothermal treatments were carried out to introduce different amounts of deleterious phases, such as chi (χ), sigma (σ) and secondary austenite (γ2). The specimens were tested by double loop electrochemical potentiodynamic reactivation test (DL-EPR). The kinetics of precipitation in the two steels was different due to the difference of the grain sizes. The results show a correlation between the sensitization degrees, measured by DL-EPR, with the amount of deleterious phases precipitated.

【 授权许可】

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