Comparison of stainless steels in simulated paper machine environments

    Research output: Contribution to journalArticleScientificpeer-review

    13 Citations (Scopus)

    Abstract

    The localized corrosion behavior of austenitic stainless steels (SS) UNS S30403 and UNS S31603, and duplex SS UNS S31803 was compared in simulated paper machine environments containing chloride, sulfate, and thiosulfate at pH 3 and 65°C. Electrochemical testing of the materials was performed by cyclic polarization scans and scratch tests. Thiosulfate caused a remarkable decrease in repassivation potentials (Epp) and a slight decrease in pitting potentials (Enp) of UNS S30403 and UNS S31603, when compared to the corresponding Epp and Enp values determined in similar solutions without thiosulfate addition. Pits on UNS S30403 and UNS S31603 steels were enriched in Cr and Cu and depleted in Fe when compared to the base metal. Thiosulfate being present in the solution pits contained also very high amounts of S. Thiosulfate was proposed to be reduced to hydrogen sulfide (H2S) inside the pits enhancing the anodic dissolution process of SS. In the case of UNS S31803, test environments had hardly any influence on the determined high Epp and Enp values. Chloride concentration had to be a minimum of 500 mg/L until any localized corrosion could be observed on UNS S31803.
    Original languageEnglish
    Pages (from-to)858-869
    Number of pages15
    JournalCorrosion
    Volume55
    Issue number9
    DOIs
    Publication statusPublished - 1999
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Thiosulfates
    Stainless Steel
    Stainless steel
    Corrosion
    Hydrogen sulfide
    Austenitic stainless steel
    Pitting
    Dissolution
    Polarization
    Chlorides
    Steel
    Testing
    Metals
    Hydrogen Sulfide
    Sulfates

    Cite this

    @article{508424ba4fcc415eb4dbd490f50b8d3a,
    title = "Comparison of stainless steels in simulated paper machine environments",
    abstract = "The localized corrosion behavior of austenitic stainless steels (SS) UNS S30403 and UNS S31603, and duplex SS UNS S31803 was compared in simulated paper machine environments containing chloride, sulfate, and thiosulfate at pH 3 and 65°C. Electrochemical testing of the materials was performed by cyclic polarization scans and scratch tests. Thiosulfate caused a remarkable decrease in repassivation potentials (Epp) and a slight decrease in pitting potentials (Enp) of UNS S30403 and UNS S31603, when compared to the corresponding Epp and Enp values determined in similar solutions without thiosulfate addition. Pits on UNS S30403 and UNS S31603 steels were enriched in Cr and Cu and depleted in Fe when compared to the base metal. Thiosulfate being present in the solution pits contained also very high amounts of S. Thiosulfate was proposed to be reduced to hydrogen sulfide (H2S) inside the pits enhancing the anodic dissolution process of SS. In the case of UNS S31803, test environments had hardly any influence on the determined high Epp and Enp values. Chloride concentration had to be a minimum of 500 mg/L until any localized corrosion could be observed on UNS S31803.",
    author = "Tarja Laitinen",
    note = "Project code: V6SU99238",
    year = "1999",
    doi = "10.5006/1.3284042",
    language = "English",
    volume = "55",
    pages = "858--869",
    journal = "Corrosion",
    issn = "0010-9312",
    number = "9",

    }

    Comparison of stainless steels in simulated paper machine environments. / Laitinen, Tarja.

    In: Corrosion, Vol. 55, No. 9, 1999, p. 858-869.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Comparison of stainless steels in simulated paper machine environments

    AU - Laitinen, Tarja

    N1 - Project code: V6SU99238

    PY - 1999

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    N2 - The localized corrosion behavior of austenitic stainless steels (SS) UNS S30403 and UNS S31603, and duplex SS UNS S31803 was compared in simulated paper machine environments containing chloride, sulfate, and thiosulfate at pH 3 and 65°C. Electrochemical testing of the materials was performed by cyclic polarization scans and scratch tests. Thiosulfate caused a remarkable decrease in repassivation potentials (Epp) and a slight decrease in pitting potentials (Enp) of UNS S30403 and UNS S31603, when compared to the corresponding Epp and Enp values determined in similar solutions without thiosulfate addition. Pits on UNS S30403 and UNS S31603 steels were enriched in Cr and Cu and depleted in Fe when compared to the base metal. Thiosulfate being present in the solution pits contained also very high amounts of S. Thiosulfate was proposed to be reduced to hydrogen sulfide (H2S) inside the pits enhancing the anodic dissolution process of SS. In the case of UNS S31803, test environments had hardly any influence on the determined high Epp and Enp values. Chloride concentration had to be a minimum of 500 mg/L until any localized corrosion could be observed on UNS S31803.

    AB - The localized corrosion behavior of austenitic stainless steels (SS) UNS S30403 and UNS S31603, and duplex SS UNS S31803 was compared in simulated paper machine environments containing chloride, sulfate, and thiosulfate at pH 3 and 65°C. Electrochemical testing of the materials was performed by cyclic polarization scans and scratch tests. Thiosulfate caused a remarkable decrease in repassivation potentials (Epp) and a slight decrease in pitting potentials (Enp) of UNS S30403 and UNS S31603, when compared to the corresponding Epp and Enp values determined in similar solutions without thiosulfate addition. Pits on UNS S30403 and UNS S31603 steels were enriched in Cr and Cu and depleted in Fe when compared to the base metal. Thiosulfate being present in the solution pits contained also very high amounts of S. Thiosulfate was proposed to be reduced to hydrogen sulfide (H2S) inside the pits enhancing the anodic dissolution process of SS. In the case of UNS S31803, test environments had hardly any influence on the determined high Epp and Enp values. Chloride concentration had to be a minimum of 500 mg/L until any localized corrosion could be observed on UNS S31803.

    U2 - 10.5006/1.3284042

    DO - 10.5006/1.3284042

    M3 - Article

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