STP576

    Galvanic Coupling of Some Stressed Stainless Steels to Dissimilar Metals Underground

    Published: Jan 1976


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    Abstract

    Stainless steels, Type 301 half hard and Type 301 full hard, have been found susceptible to failure by hydrogen embrittlement when stressed as low as 40 percent of their yield strength and cathodically charged above 1 μA/cm2 by galvanic coupling to a dissimilar metal in four years of exposure at six underground test sites. However, stainless steels Type 304 and alloys 26Cr-1Mo and 26Cr-6.5Ni were resistant under similar conditions. Failures by stress-corrosion cracking were not observed in any of the materials. Electrochemical measurements made periodically above ground are correlated with the subsequent visual examination of the specimens.

    Keywords:

    corrosion, galvanic corrosion, hydrogen embrittlement, soils, stainless steels, stresses, stress corrosion, underground corrosion


    Author Information:

    Escalante, E.
    Metallurgist and materials engineer, Institute for Materials Research, National Bureau of Standards, Washington, D. C.

    Gerhold, W. F.
    Metallurgist and materials engineer, Institute for Materials Research, National Bureau of Standards, Washington, D. C.


    Paper ID: STP41399S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP41399S


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