Abstract
The stress corrosion cracking of metals is caused by the simultaneous attack of special chemical reactants and tensile stress. Accordingly, it is affected by several factors in environments.In this paper, these are investigated on the effects of outdoor atmospheric environments on shear cracks of a commercial Al-Zn-Mg alloy. The cracks mean the stress corrosion cracking in the short transverse direction due to the residual stress caused by shearing.The occurrence of the shear cracks was varied according to the season of the year. They were not likely to occur during the period from October to April, but were liable to occur from May to September; especially from July to August. Therefore, it was recommended for the stress corrosion cracking tests in the outdoor atmospheric environments that the exposure would be started in April to select the test peiod of at least 6 months from April to September. The specimens, which were not cracked during the above period, were supposed to be not cracked during the following 6 months from October to March.The effects of several factors in outdoor environments on the shear cracks were also discussed. It was suggested that Cl- was an important factor as well as temperature and humidity affecting the cracks.
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