Long-term outdoor stress corrosion testing of overaged 7000 series aluminium alloys

Report (1988)

Authors

L. Schra

W.G.J. 't Hart

Exposure Aluminium alloys Corrosion resistance Stress corrosion cracking Corrosion tests High strength alloys Forgings Metal plates Transgranular corrosion Accelerated life tests

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Published Date

31-01-1988

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NLR-TR 88012 U

Abstract

Long-term outdoor stress corrosion tests were executed on overaged 7000 series aluminium alloy plate and forgings. Plate material of the alloys 7010-T7651, 7010-T7451 and 7075-T7351 exhibited an excellent resistance to SCC. PM alloy X7091-T7E69 forgings combined a higher strength with superior SCC resistance as compared to IM alloy forgings. The SCC resistance of forgings of the alloys 7075-T73 and 7050-T74 was substantially better than that of forgings of the alloys 7175-T74, 7010-T74 and AZ74.61. When strength was taken into account only the SCC propagation resistance of 7010-T74 was clearly inferior to that of the other alloys. Accelerated laboratory tests did not always enable a correct prediction of the SCC resistance; this emphasizes the importance of verification of laboratory tests by testing in a more realistic environment, especially for classification of new materials. SCC growth was affected by corrosion product wedging which may also occur in aircraft structures and complicates prediction of SCC growth.

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