The role of intermetallic precipitates (IMPs) of Al2MgCu, Al7Cu2Fe, and MgZn2 on metastable pitting of high-zinc 7068 aluminum alloy is studied by using electrochemical noise. Experimental results and microstructural constituents characterized by using scanning electron microscopy analysis are compared. Findings reveal a strong correlation between the MgZn2 IMPs and metastable pitting events. However, the shape of the current transient events depends on the electrode potential and passive film protective ability. Besides, MgZn2 IMPs dominantly enhance the complex electrochemical activities such as microgalvanic coupling and reactivation or repassivation of pits near the breakdown potential. The cathodic current transients depend on the electrode potential, the protective ability of the passive layer, and the presence of nobler Al7Cu2Fe IMPs.
Skip Nav Destination
Article navigation
1 April 2025
Research Article|
February 18 2025
Elucidating the Role of Intermetallics in Metastable Pitting of 7068 Alloy Using Electrochemical Noise
Ankur Kumar;
Ankur Kumar
*Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, 247667, India.
Search for other works by this author on:
Gajanan P. Chaudhari
Gajanan P. Chaudhari
‡
*Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, 247667, India.
‡Corresponding author. E-mail: [email protected].
Search for other works by this author on:
‡Corresponding author. E-mail: [email protected].
Online ISSN: 1938-159X
Print ISSN: 0010-9312
© 2025, AMPP
2025
CORROSION (2025) 81 (4): 382–396.
Citation
Ankur Kumar, Gajanan P. Chaudhari; Elucidating the Role of Intermetallics in Metastable Pitting of 7068 Alloy Using Electrochemical Noise. CORROSION 1 April 2025; 81 (4): 382–396. https://doi.org/10.5006/4646
Download citation file:
41
Views
Citing articles via
Suggested Reading
Characterization of Oxidation Products on a ZrFe2-Type Laves Intermetallic Exposed to 200°C Steam
CONF_MAR2001
Perspective on “Metastable Pitting of Stainless Steel,” G.S. Frankel, L. Stockert, F. Hunkeler, H. Boehni, Corrosion 43, 7 (1987): p. 429-436
CORROSION (February,2019)