Interplay between surface characteristics, initial oxidation behavior, and corrosion performance of ferritic stainless steels under simulated automotive exhaust gas condensate conditions

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    Abstract

    This paper reports on the interplay between surface characteristics, initial oxidation behavior, and corrosion performance of three ferritic stainless steels, grades EN 1.4512, EN 1.4510, and EN 1.4509, all with three different rough cold-rolled surface finishes, under simulated exhaust gas condensate conditions corresponding to those at the cold end of automotive exhaust system. As-received specimens are characterized with respect to surface roughness and grain size. Initial oxidation behavior of specimens, corresponding to the thermal aging step in the cyclic exhaust gas condensate corrosion test, is examined gravimetrically and regarding morphology and key alloying element profiles. These characteristics are correlated with the specimens' performance in the corrosion tests. Initial oxidation at 300°C introduced slightly greater weight gains and thicker oxide films in 12 wt% Cr grade EN 1.4512 than in higher-Cr grades EN 1.4510 and EN 1.4509, although at 600°C the differences were also evident between the higher-Cr grades and were dependent on the surface characteristics. Indeed, morphology and alloying element profiles were influenced by the surface finish, with the most uniform oxide film morphology and Cr, and stabilizing alloying element profiles were obtained for grade EN 1.4510 with surface finish S2 that featured the highest roughness in this alloy. This was also the alloy-surface finish combination that exhibited the best corrosion performance under simulated exhaust gas condensate corrosion test, with almost all other specimens experiencing intergranular corrosion in such areas of the specimens that were intermittently subjected to simulated exhaust gas condensate solution. The results presented in this paper demonstrate the importance of selection of a proper combination of surface characteristics, e.g., roughness, and alloy composition when pursuing sustainability by the means of materials selection.
    Original languageEnglish
    Pages (from-to)422-438
    JournalCorrosion
    Volume72
    Issue number3
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Gas condensates
    Stainless Steel
    Ferritic steel
    Exhaust gases
    Stainless steel
    Corrosion
    Oxidation
    Alloying elements
    Surface roughness
    Oxide films
    Thermal aging
    Thick films
    Sustainable development
    Chemical analysis

    Keywords

    • acid solutions
    • intergranular corrosion
    • oxidation
    • scanning electron microscope
    • stainless steel
    • weight loss

    Cite this

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    title = "Interplay between surface characteristics, initial oxidation behavior, and corrosion performance of ferritic stainless steels under simulated automotive exhaust gas condensate conditions",
    abstract = "This paper reports on the interplay between surface characteristics, initial oxidation behavior, and corrosion performance of three ferritic stainless steels, grades EN 1.4512, EN 1.4510, and EN 1.4509, all with three different rough cold-rolled surface finishes, under simulated exhaust gas condensate conditions corresponding to those at the cold end of automotive exhaust system. As-received specimens are characterized with respect to surface roughness and grain size. Initial oxidation behavior of specimens, corresponding to the thermal aging step in the cyclic exhaust gas condensate corrosion test, is examined gravimetrically and regarding morphology and key alloying element profiles. These characteristics are correlated with the specimens' performance in the corrosion tests. Initial oxidation at 300°C introduced slightly greater weight gains and thicker oxide films in 12 wt{\%} Cr grade EN 1.4512 than in higher-Cr grades EN 1.4510 and EN 1.4509, although at 600°C the differences were also evident between the higher-Cr grades and were dependent on the surface characteristics. Indeed, morphology and alloying element profiles were influenced by the surface finish, with the most uniform oxide film morphology and Cr, and stabilizing alloying element profiles were obtained for grade EN 1.4510 with surface finish S2 that featured the highest roughness in this alloy. This was also the alloy-surface finish combination that exhibited the best corrosion performance under simulated exhaust gas condensate corrosion test, with almost all other specimens experiencing intergranular corrosion in such areas of the specimens that were intermittently subjected to simulated exhaust gas condensate solution. The results presented in this paper demonstrate the importance of selection of a proper combination of surface characteristics, e.g., roughness, and alloy composition when pursuing sustainability by the means of materials selection.",
    keywords = "acid solutions, intergranular corrosion, oxidation, scanning electron microscope, stainless steel, weight loss",
    author = "Elina Huttunen-Saarivirta and Pekka Pohjanne and Tarja Laitinen",
    year = "2016",
    doi = "10.5006/1904",
    language = "English",
    volume = "72",
    pages = "422--438",
    journal = "Corrosion",
    issn = "0010-9312",
    number = "3",

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    TY - JOUR

    T1 - Interplay between surface characteristics, initial oxidation behavior, and corrosion performance of ferritic stainless steels under simulated automotive exhaust gas condensate conditions

    AU - Huttunen-Saarivirta, Elina

    AU - Pohjanne, Pekka

    AU - Laitinen, Tarja

    PY - 2016

    Y1 - 2016

    N2 - This paper reports on the interplay between surface characteristics, initial oxidation behavior, and corrosion performance of three ferritic stainless steels, grades EN 1.4512, EN 1.4510, and EN 1.4509, all with three different rough cold-rolled surface finishes, under simulated exhaust gas condensate conditions corresponding to those at the cold end of automotive exhaust system. As-received specimens are characterized with respect to surface roughness and grain size. Initial oxidation behavior of specimens, corresponding to the thermal aging step in the cyclic exhaust gas condensate corrosion test, is examined gravimetrically and regarding morphology and key alloying element profiles. These characteristics are correlated with the specimens' performance in the corrosion tests. Initial oxidation at 300°C introduced slightly greater weight gains and thicker oxide films in 12 wt% Cr grade EN 1.4512 than in higher-Cr grades EN 1.4510 and EN 1.4509, although at 600°C the differences were also evident between the higher-Cr grades and were dependent on the surface characteristics. Indeed, morphology and alloying element profiles were influenced by the surface finish, with the most uniform oxide film morphology and Cr, and stabilizing alloying element profiles were obtained for grade EN 1.4510 with surface finish S2 that featured the highest roughness in this alloy. This was also the alloy-surface finish combination that exhibited the best corrosion performance under simulated exhaust gas condensate corrosion test, with almost all other specimens experiencing intergranular corrosion in such areas of the specimens that were intermittently subjected to simulated exhaust gas condensate solution. The results presented in this paper demonstrate the importance of selection of a proper combination of surface characteristics, e.g., roughness, and alloy composition when pursuing sustainability by the means of materials selection.

    AB - This paper reports on the interplay between surface characteristics, initial oxidation behavior, and corrosion performance of three ferritic stainless steels, grades EN 1.4512, EN 1.4510, and EN 1.4509, all with three different rough cold-rolled surface finishes, under simulated exhaust gas condensate conditions corresponding to those at the cold end of automotive exhaust system. As-received specimens are characterized with respect to surface roughness and grain size. Initial oxidation behavior of specimens, corresponding to the thermal aging step in the cyclic exhaust gas condensate corrosion test, is examined gravimetrically and regarding morphology and key alloying element profiles. These characteristics are correlated with the specimens' performance in the corrosion tests. Initial oxidation at 300°C introduced slightly greater weight gains and thicker oxide films in 12 wt% Cr grade EN 1.4512 than in higher-Cr grades EN 1.4510 and EN 1.4509, although at 600°C the differences were also evident between the higher-Cr grades and were dependent on the surface characteristics. Indeed, morphology and alloying element profiles were influenced by the surface finish, with the most uniform oxide film morphology and Cr, and stabilizing alloying element profiles were obtained for grade EN 1.4510 with surface finish S2 that featured the highest roughness in this alloy. This was also the alloy-surface finish combination that exhibited the best corrosion performance under simulated exhaust gas condensate corrosion test, with almost all other specimens experiencing intergranular corrosion in such areas of the specimens that were intermittently subjected to simulated exhaust gas condensate solution. The results presented in this paper demonstrate the importance of selection of a proper combination of surface characteristics, e.g., roughness, and alloy composition when pursuing sustainability by the means of materials selection.

    KW - acid solutions

    KW - intergranular corrosion

    KW - oxidation

    KW - scanning electron microscope

    KW - stainless steel

    KW - weight loss

    U2 - 10.5006/1904

    DO - 10.5006/1904

    M3 - Article

    VL - 72

    SP - 422

    EP - 438

    JO - Corrosion

    JF - Corrosion

    SN - 0010-9312

    IS - 3

    ER -