STP978

    The Effect of Soil Resistivity and Soil Temperature on the Corrosion of Galvanically Coupled Metals in Soil

    Published: Jan 1988


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    Abstract

    Galvanic corrosion current measurements carried out on stressed Type 301 stainless steel coupled to zinc at six underground test sites over a period of four years indicate that the galvanic current is controlled by soil resistivity or oxygen availability in the soil. In well aerated soils, resistivity plays a dominant role, but in poorly aerated soils, oxygen controls the corrosion process. Furthermore, at a certain depth, approximately 1 m, soil resistivity is strongly influenced by soil temperature and only slightly affected by soil moisture. Finally, Type 301 stainless steel in a half-hard or full-hard condition is susceptible to hydrogen embrittlement failure in soil when exposed to potentials capable of causing hydrogen evolution.

    Keywords:

    corrosion, soils, galvanic corrosion, hydrogen embrittlement, metallic corrosion, soil resistivity, soil temperature


    Author Information:

    Escalante, E
    Metallurgist, Corrosion Group, National Bureau of Standards, Gaithersburg, MD


    Paper ID: STP26199S

    Committee/Subcommittee: G01.07

    DOI: 10.1520/STP26199S


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