STP727

    Electrochemical Behavior of Carbon Steel in Fused Salts

    Published: Jan 1981


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    Abstract

    The polarization resistance method was used to assess the corrosion rate and to study the oxidation kinetics of carbon steel in a fused nitrate-sulfate-chloride salt mixture at 316°C (600°F) and in an alkali iron trisulfate salt at 677°C (1250°F). The same method was also applied to estimate the corrosion rate of carbon steel through the solidified frozen alkali iron trisulfate salt.

    Equilibrium potential/pO2− diagrams were constructed for iron, nitrate, and nitrate-reaction products to aid in the interpretation of corrosion data for the nitrate-rich salt and to determine the various chemical reactions causing the corrosion.

    Keywords:

    polarization resistance, Tafel slope, admittance, fused salt, solidified frozen salt layer, potential/pO, 2−, diagram


    Author Information:

    Chen, CM
    Senior research engineer and group supervisor, Babcock & Wilcox, Alliance, Ohio

    Theus, GJ
    Senior research engineer and group supervisor, Babcock & Wilcox, Alliance, Ohio


    Paper ID: STP28041S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP28041S


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