Author(s)

H.A. Jawaif, J. Labanowski & A. Zielinski

Abstract

Stress corrosion cracking of the AlZnSMgl alloy H.A. Jawaif, J. Labanowski*>, A. Zielinski^ *Ship Materials Department, Gdynia Maritime Academy, 81-225 Gdynia, Poland * Materials Engineering Department, Technical University of Gdansk, Narutowicza 11/12, 80-952 Gdansk, Poland Abstract The results of stress corrosion and corrosion tests of the AlZnSMgl alloy of different tempers are shown to be related to test solution composition. The most susceptible to stress corrosion cracking was the underaged alloy tested under constant load in HCl-containing solutions. The comparison of stress corrosion and corrosion tests shows that the cracking may be considered in terms of hydrogen-related crack propagation. The remarkable degradation of the underaged alloy is assumed to relate to the gram boundary microstructure. Introduction Most of engineering wrought Al alloys, the Al-Zn-Mg 7xxx alloys including, may fail under joint action of environment and mechanical stresses. The corrosion

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