STP425

    A Rapid Stress Corrosion Test for Aluminum-Magnesium Alloys

    Published: Jan 1967


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    Abstract

    The susceptibility of aluminum-magnesium alloys to stress corrosion cracking may be determined using a rapid, electrolytic test method. The stressed specimen, deflected as a beam, is made the anode in a 3.5 per cent salt solution by impressing a current of 40 ma/in. Prior to testing, a set of specimens may be heated, each one for an increased period of time over the previous one, to develop susceptibility in a part of the set of specimens. Test conditions have been chosen to maximize chances of failing materials with low degrees of susceptibility, while still not failing materials known to be nonsusceptible. Results with two commercially produced alloys are presented. Alloy 5083 shows less tendency to develop susceptibility than alloy 5456. The effect of cold work in accelerating the sensitivity to stress corrosion cracking is also shown.

    Keywords:

    aluminum-magnesium alloys, stress corrosion, corrosion, aging, heat treatment, electrolysis, salt solutions


    Author Information:

    Craig, H. L.
    Research supervisor and scientistPersonal members ASTM, Reynolds Metals Co., Richmond, Va.

    Romans, H. B.
    Research supervisor and scientistPersonal members ASTM, Reynolds Metals Co., Richmond, Va.


    Paper ID: STP46452S

    Committee/Subcommittee: G01.05

    DOI: 10.1520/STP46452S


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