STP665

    Effect of Oxyanions and Chloride Ion on the Stress Corrosion Cracking Susceptibility of Admiralty Brass in Nonammoniacal Aqueous Solutions

    Published: Jan 1979


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    Abstract

    The stress corrosion cracking (SCC) susceptibility of admiralty brass in several nonammoniacal solutions of pH ∼8 has been investigated at 25 °C using the slow strain-rate technique. The SCC tests were made at a controlled potential of 300 mVH. This potential is close to the cupric oxide/cuprous oxide (CuO/Cu2O) equilibria, in near neutral solutions (6 < pH < 8), on the potential-pH diagram of copper. In the present study, cracking occurred in several solutions; the severity of the cracking depended upon the type of anion present in the test solution. The order of anions in decreasing tendency to promote SCC in admiralty brass was: NO2- > NO3- > ClO3- > SO4= > MoO4= > Cl- > WO4= > HCO3- > B4O7= > CrO4=. The estimated crack velocity ranged from high values of the order of 10-7 m/s in the nitrite solution to no cracking in the phosphate and the solutions following it in the above series. The cracking was always transgranular with considerable branching in some cases.

    Keywords:

    admiralty metal, stress corrosion cracking, oxyanions, slow strain rate


    Author Information:

    Kawashima, A
    Visiting research associate, adjunct assistant professor, and professor, The Ohio State University, Columbus, Ohio

    Agrawal, AK
    Visiting research associate, adjunct assistant professor, and professor, The Ohio State University, Columbus, Ohio

    Staehle, RW
    Visiting research associate, adjunct assistant professor, and professor, The Ohio State University, Columbus, Ohio


    Paper ID: STP38120S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP38120S


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