Effect of alloy composition on stress corrosion cracking susceptibility of duplex stainless steels in hot alkaline sulfide solution

Heikki Leinonen, Pekka Pohjanne, K.R. Chasse, P.M. Singh, J. Romu, T. Saukkonen, H. Hänninen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    1 Citation (Scopus)


    Stress corrosion cracking (SCC) susceptibility of the duplex stainless steels E 1.4162 (U S S32101) and E 1.4462 (U S S32205) was evaluated with U-bend specimens in the alkaline sulfide solution containing 100 g/l aOH and 55 g/l a 2S. Complementary potentiodynamic measurements were used to evaluate the effect of alloy composition on corrosion and on passivation behavior of the duplex stainless steels. The reference material in the study was the austenitic stainless steel E 1.4301 (U S S30400). Based on separate potentiodynamic curves and the free corrosion potential measurements of the alloys during the SCC tests, it is evident that Cr and i as the main alloying elements in duplex stainless steels raised the corrosion potential and lowered the critical current density of the steel, thus improving SCC resistance. Based on the potentiodynamic curves the alloying elements Mo and Mn were highly active in the hot caustic solution. SCC in the austenitic reference stainless steel was severe penetrating in the unaffected material but in the duplex stainless steels cracking was observed only inside the affected surface layer. Selective dissolution of Fe, Cr, Mn and Mo and/or enrichment of i and Cr as well as a, S and O took place in the affected surface layers of the duplex stainless steels depending on the steel grade
    Original languageEnglish
    Title of host publicationCorrosion conference and expo 2012
    PublisherNational Association of Corrosion Engineers (NACE)
    ISBN (Print)978-1-6227-6078-7
    Publication statusPublished - 2012
    MoE publication typeA4 Article in a conference publication
    EventCorrosion conference and expo 2012: NACE International corrosion 2012 conference and expo - Salt Lake City, United States
    Duration: 11 Mar 201215 Mar 2012

    Publication series

    SeriesNACE - International Corrosion Conference Series


    ConferenceCorrosion conference and expo 2012
    Abbreviated titleCORROSION2012
    Country/TerritoryUnited States
    CitySalt Lake City


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