SEDL / STP / STP425-EB / STP46460S

A Quantitative Stress Corrosion Test for Al-Zn-Mg Alloy Plate

Rosenthal, H.
Research advisor, and physical science technicianpersonal member ASTM, United States Army, Philadelphia, Pa.

Pritchard, H. R.
Research advisor, and physical science technicianpersonal member ASTM, United States Army, Philadelphia, Pa.

Pages: 17    Published: Jan 1967

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Abstract

The stress corrosion susceptibility of Al-4.25Zn–2.9Mg plate was determined in the short-transverse direction. C-ring type specimens were exposed to alternate immersion in a NaCl solution. It was shown that laboratory temperature and humidity must be controlled to obtain reproducible results. Time-to-failure results for a given lot of material have a normal distribution when failure times are converted to logarithms. Tests were also made in a marine environment and in an industrial environment. These outdoor results for various lots follow the same ranking for susceptibility as determined by the alternate-immersion tests.