The corrosion behaviour of 409 stainless steel (0.014% C, 0.51% Si, 0.22% Mn, 11.5% Cr, 0.16% Ti, 0.19% Nb) oxidized cyclically at various environmental temperatures was studied in the simulated condensate solution of mufflers. The oxidation is accelerated by increasing the temperature from 200 to 400 °C. The presence of condensates dipped on the specimen surface may enhance the oxidation process, leading to form defective oxide films and Cr-depletion underlying the films especially at 400 °C. Sulfate from the condensate-dipping will give rise to sulfidation during the cyclic oxidation, being detrimental to both the oxidation and corrosion properties of stainless steel. The oxidation lower than 250 °C enhances the passive state of stainless steel while oxidation above 300 °C deteriorates its corrosion resistance, even into active corrosion. The active corrosion through the defects such as cracks and nodules in oxide films may be responsible for the perforation of mufflers.


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    Title :

    Effect of environmental temperature on condensate corrosion of type 409 stainless steel in automotive mufflers


    Additional title:

    Einfluss der Umgebungstemperatur auf die Kondensat-Korrosion eines nichtrostenden Stahls vom Typ 409 in Schalldämpfern für Kraftfahrzeuge


    Contributors:
    Li, Moucheng (author) / Wang, Shidong (author) / Wei, Qiang (author) / Bi, Hongyun (author)


    Publication date :

    2013


    Size :

    9 Seiten, 9 Bilder, 3 Tabellen, 25 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English







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