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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.