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Study of aging and electrochemical behaviour of AlLiCuMg alloys
Author(s) -
Ghosh K. S.,
Mukhopadhyay S.,
Konar B.,
Mishra B.
Publication year - 2013
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201106409
Subject(s) - materials science , alloy , electrochemistry , corrosion , precipitation , metallurgy , open circuit voltage , precipitation hardening , chemistry , electrode , voltage , physics , quantum mechanics , meteorology
Aging study of 1441 and 8090 AlLiCuMg alloys exhibited characteristic precipitation hardening phenomena. Potentiodynamic polarisation studies carried out on various tempers of the 1441 and 8090 AlLiCuMg alloys in 3.5% NaCl, with a small amount of H 2 O 2 , and in 3.5% NaCl solution with pH 10 and 12 showed the shifting of open circuit potential (OCP) towards more negative potential and higher corrosion rate, with the increase of aging time. The OCP value has shifted anodically with addition of H 2 O 2 in 3.5% NaCl solution. Further, passivity phenomenon has been observed for all the alloy tempers in 3.5% NaCl solution at pH 10 and 12. The observation of OCP shift towards more negative potential and the higher corrosion rate with the increase of aging time has been attributed to the presence of higher amounts of anodic δ (AlLi), S′ (Al 2 CuMg) and T 1 (Al 2 CuLi) phases, studied by TEM, XRD and DSC methods.