STRESS CORROSION OF Al‐4.4 Zn ALLOY

Abstract

Tests have been carried out to determine the stress corrosion susceptibility of Al‐4.4 a/o Xn alloy in the aged condition. Flat ribbon specimens were tested in aqueous solutions containing 3.5% NaCl at a constant stress of 5.76 kg/mm2 (32% of UTS). Polarisation studies carried out on the stressed and unstressed specimens reveal that the Tafel slopes have a much lower value in the stressed condition. The susceptibility to stress corrosion increases with the test temperature. An equation of the type Z=K. exp (—E/RT) with reciprocal life Z and test temperature T, is found to fit the data from which the value of the activation energy is found to be ca. 20 kcal.mol−1.

Citation

Chandrashekar, R. and Vasu, K.I. (1972), "STRESS CORROSION OF Al‐4.4 Zn ALLOY", Anti-Corrosion Methods and Materials, Vol. 19 No. 1, pp. 18-20. https://doi.org/10.1108/eb006845