2005•Zhongguo fushi yu fanghu xuebaoRequires access

STRESS CORROSION CRACKING AND EXFOLIATION CORROSION RESISTANCE OF Al-Mg ALLOY WITH ADDITION OF SCANDIUM

Ting Wu

Abstract

The stress corrosion cracking and exfoliation corrosion resistance of Al-Mg alloy with high level of Mg and trace Sc addition were studied by means of such methods as stress corrosion cracking and exfoliation corrosion test of Al-Mg alloys in GJB1742-1993.Their microstructures were observed by using optical microscope and transmission electron microscope (TEM).The results showed that Al-Mg alloy with trace Sc addition has good stress corrosion cracking and exfoliation corrosion resistance,and a homogeneous,dispersed distribution of β-phase (Mg_5Al_8,Mg_2Al_3) in microstructures.The discontinuous precipitation of β-phase in grain boundaries therefore highly improved corrosion resistance of the alloy.

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Key concepts: Materials science, Corrosion, Metallurgy, Scandium, Alloy, Stress corrosion cracking, Microstructure, 6111 aluminium alloy