SYMPOSIA PAPER Published: 01 January 1967

Environmental Factors Affecting the Stress Corrosion Cracking Behavior of an Aluminum-Zinc-Magnesium Alloy


The stress corrosion cracking phenomenon in an aluminumzinc-magnesium alloy is affected by the environmental factors in a different fashion than the way these factors affect other corrosion processes. The presence of traces of moisture is sufficient for stress corrosion cracking to proceed; the absence of moisture prevents cracking. The time required to initiate stress corrosion cracking is affected mostly by the temperature of the environment. Wide variations in sodium chloride concentration have no effect on the time-to-failure. Changes in solution pH and contamination with dissolved copper alter the time required to produce failure, so that stress corrosion cracking is not a continuous function of either variable. Evidence is presented which shows that the manner of stressing a specimen and specimen configuration both affect failure time. These anomalies may be used to understand the lack of reproducibility of stress corrosion testing and the difficulties encountered in correlation studies, either among different tests or the same test carried out by different laboratories.

Author Information

Romans, H., B.
Reynolds Metals Co., Richmond, Va.
Craig, H., L.
Reynolds Metals Co., Richmond, Va.
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Developed by Committee: G01
Pages: 363–381
DOI: 10.1520/STP46469S
ISBN-EB: 978-0-8031-6808-4
ISBN-13: 978-0-8031-6638-7