Abstract
Abstract The aim of the present work was to evaluate the effects of heat treatment on: the microstructure of Al-Li 8090 alloy; its electrochemical properties (polarisation resistance, pitting resistance); and the composition of its corrosion products in sea water. Free corrosion and electrochemical tests were carried out at 25°C in quiescent sea water at pH 8·2 with a dissolved oxygen content of 6·5 ppm. The microstructure was examined by metallographic microscopy and by X-ray microdiffractometry; electrochemical properties (polarisation resistance, pitting resistance) were studied using electrochemical impedance spectroscopy; and pit formation and growth were assessed with optical microscopy. The corrosion layer was characterised with X-ray photoelectron spectroscopy (XPS). Aging treatment led to a non-homogeneous structure which enhanced alloy pitting susceptibility; aging also led to lithium enrichment of the alloy surface. Only the initial general corrosion stage was affected by lithium enrichment, as...
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