Volume 5, Issue 5 (May 2008)

    Corrosion of Phosphoric Irons in Acidic Environments

    (Received 18 April 2007; accepted 11 April 2008)

    Published Online: 2008

    CODEN: JAIOAD

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    Abstract

    The corrosion behavior of phosphoric irons (i.e., Fe-P alloys containing low phosphorus in the range 0.1 to 0.5 wt. %), prepared by ingot metallurgy route, was evaluated in acidic and chloride environments, e.g., 0.25 M H2SO4 of pH 0.6, 0.5 M Na2SO4 of pH 3 and 3.5 % NaCl of pH 6.8. A plain carbon steel and a low alloy (Cu-Cr) steel were also studied for comparison purpose. The effect of Cu and Cr additions was beneficial in a highly acidic condition. While similar corrosion rates observed for plain carbon steel and low alloy steel in 0.5 M Na2SO4 of pH 3, a slightly higher corrosion rate was observed for phosphoric irons. All alloys exhibited lowest and similar corrosion rates in neutral 3.5 % NaCl corrosive media. The linearity of Tafel slopes in the cathodic region varied with the pH of the solution. Corrosion rates were higher at lower pH due to the major contribution of hydrogen evolution reaction to the cathodic current.


    Author Information:

    Sahoo, Gadadhar
    Doctoral StudentAssistant Manager, Department of Materials and Metallurgical Engineering, Indian Institute of TechnologyR&D Center for Iron and Steel, Steel Authority of India Limited, Ranchi,

    Balasubramaniam, R.
    Professor, Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur,


    Stock #: JAI101191

    ISSN: 1546-962X

    DOI: 10.1520/JAI101191

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    Author
    Title Corrosion of Phosphoric Irons in Acidic Environments
    Symposium Advances in Electrochemical Techniques for Corrosion Monitoring and Measurement, 2007-05-23
    Committee A01