Effect of Electrochemical Potential on Stress Corrosion Cracking Susceptibility of EN 1.4301 (AISI 304) Austenitic Stainless Steels in Simulated Hot Black Liquor

Pekka Pohjanne, Mikko Vepsäläinen, Timo Saario (Corresponding Author), Konsta Sipilä, Jyrki Romu, Tapio Saukkonen, Hannu Hänninen, Mikko Heikkilä, Juha Koskiniemi, Carl-Gustav Berg, Martti Pulliainen, Isto Virtanen, Thomas Ohligschläger

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)

    Abstract

    Stress corrosion cracking (SCC) susceptibility of austenitic EN 1.4301 (AISI 304) stainless steel was studied as a function of electrode potential at T = 190°C in 15 g kg-1 NaOH + 150 g kg-1 Na2S containing caustic environment simulating heavy black liquors (HBL) of pulp industry. Severe cracking was detected at corrosion potential and at cathodic potential of -0.11 V vs. Mo/MoS2 reference electrode. On the other hand, at anodic potentials of +0.03 to +0.3 V vs. Mo/MoS2 no cracking was observed. Thus, SCC of EN 1.4301 steel can potentially be mitigated in HBL environment by applying anodic protection. At the corrosion potential selective dissolution of Fe and slight localized enrichment of Ni and Cr as well as Na, S and O was observed. At anodic potentials Fe was selectively dissolved and marked enrichment of both Ni and Cr as well as Na, S and O took place in the corrosion product. The simultaneous enrichment of Ni and Cr in the corrosion product film was concluded to be the precondition to prevent stress corrosion cracking.
    Original languageEnglish
    Pages (from-to)887-894
    JournalCorrosion
    Volume71
    Issue number7
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Keywords

    • austenitic stainless steel
    • stress corrosion cracking
    • selective dissolution
    • alkaline solution
    • sodium hydroxide
    • sodium sulfide

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