Abstract
The effect of microstructural heterogeneity on the pitting tendency of aluminium alloy AAA2618 (2.5 Cu, 1.4 Fe, 1.8 Mg, 1.1 Ni was studied after solution treatment for 5 h at 530°C, followed by quenching in water at 80°C, and subsequent ageing for 20 h at 200°C. The microstructure was examined by optical microscopy, transmission electron microscopy, and electron-probe microanalysis. The pitting tendency was evaluated by measuring (a) the induction time for passivity breakdown in 0.1 N H 2SO 4 + 10 −3 N NaCl at − 500mV(SCE), and (b) the fraction of pitted area after 6 min exposure to treatment (a). Significant differences in pitting tendency between the two treatment versions are attributed to the weak passive film on Al 2CuMg, the strengthening phase in the aged alloy.
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