STP425: Stress Corrosion Testing of 7079-T6 Aluminum Alloy in Various Environments

    Lifka, B. W.
    Engineer and assistant chief, Alcoa Research Laboratories, New Kensington, Pa.

    Sprowls, D. O.
    Engineer and assistant chief, Alcoa Research Laboratories, New Kensington, Pa.

    Pages: 21    Published: Jan 1967


    Abstract

    Stress corrosion cracking of certain 7079-T6 aluminum alloy aircraft structures involving sustained tensile stress acting in an unfavorable grain direction has occurred sometimes in surprisingly mild environments. The resistance of short-transverse specimens of 7079-T6 products has been evaluated at different levels of applied stress in several different seacoast and inland industrial atmospheres. It was found that the atmosphere was more critical than the generally accepted alternate-immersion test using 3.5 per cent sodium chloride. The results of the outdoor tests are correlated with eight accelerated exposures; and consideration is given to the most suitable laboratory stress corrosion test environment for this alloy. A detailed analysis of the constant deformation methods of stressing is included.

    Keywords:

    corrosion, stress corrosion, aluminum alloys, environmental testing, exposure testing, chlorides, salt solution, salt spray test, anisotropy


    Paper ID: STP46468S

    Committee/Subcommittee: G01.05

    DOI: 10.1520/STP46468S


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