Synergistic impact of ECAP and thermal treatments on the corrosion performance of AZ91 Mg alloy
8 affiliations
- 1Department of Mechanical Engineering, RV Institute of Technology and Management, Bangalore, Karnataka, India
- 2Department of Industrial Engineering and Management, M S Ramaiah Institute of Technology, Bangalore, India
- 3School of Computer Science and Engineering, RV University, Bangalore, Karnataka, India
- 4Department of Mechanical Engineering, Jain College of Engineering, Belagavi, Karnataka, India
- 5Department of Mechanical Engineering, Nitte Meenakshi Institute of Technology, Nitte (Deemed to be University), Bengaluru, India
- 6Department of Mechanical Engineering, Dayananda Sagar College of Engineering, Bengaluru, Karnataka, India
- 7Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, India
- 8Department of Mechanical Engineering, Manipal University Jaipur, Jaipur, Rajasthan, India
Abstract
This research examines the synergistic action of Equal-Channel-Angular-Pressing (ECAP) and heat treatments on the corrosion characteristics of AZ91 Mg alloy, a metal that is renowned for its mechanical and light weight properties but flawed by susceptibility to corrosion. The AZ91 alloy was ECAP for two and four passes to reduce its microstructure and afterwards, followed by the treatment of annealing and aging at the temperature of 523 K, 623 K and 723 K with treatment times of 6 and 12 hours. In order to investigate grain structure and secondary phase distribution, microstructural analysis was carried out using energy dispersive X-ray spectroscopy (EDX), optical microscopy (OM), and scanning electron microscopy (SEM). Potentiodynamic polarization experiments in a 3.5 wt. % NaCl environment were performed to assess corrosion behavior and found that the ECAP and subsequent heat treatments greatly improved corrosion resistance. Tests found that a combination of ECAP followed by annealing at 723 K for 12 hours produced a uniform distribution of secondary phases, with resultant smaller corrosion current densities and better electrochemical stability. The results show that the coupled processing methods successfully enhance the corrosion performance of AZ91 Mg alloy, which offers significant findings for its use in corrosive environments.
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BibTeX
@article{naik2026synergistic,
title = {{Synergistic impact of ECAP and thermal treatments on the corrosion performance of AZ91 Mg alloy}},
author = {Gajanan M. Naik and M. Rajesh and S. Ramesh and Madhavi Magi and Shiv Pratap Singh Yadav and Ravi Kumar S. R and Gajanan Anne and Priyaranjan Sharma},
journal = {PLOS One},
year = {2026},
month = sep,
doi = {10.1371/journal.pone.0354359},
url = {https://doi.org/10.1371/journal.pone.0354359},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Synergistic impact of ECAP and thermal treatments on the corrosion performance of AZ91 Mg alloy
AU - Gajanan M. Naik
AU - M. Rajesh
AU - S. Ramesh
AU - Madhavi Magi
AU - Shiv Pratap Singh Yadav
AU - Ravi Kumar S. R
AU - Gajanan Anne
AU - Priyaranjan Sharma
PY - 2026
DA - 2026/09/25
JO - PLOS One
DO - 10.1371/journal.pone.0354359
UR - https://doi.org/10.1371/journal.pone.0354359
AB - This research examines the synergistic action of Equal-Channel-Angular-Pressing (ECAP) and heat treatments on the corrosion characteristics of AZ91 Mg alloy, a metal that is renowned for its mechanical and light weight properties but flawed by susceptibility to corrosion. The AZ91 alloy was ECAP for two and four passes to reduce its microstructure and afterwards, followed by the treatment of annealing and aging at the temperature of 523 K, 623 K and 723 K with treatment times of 6 and 12 hours. In order to investigate grain structure and secondary phase distribution, microstructural analysis was carried out using energy dispersive X-ray spectroscopy (EDX), optical microscopy (OM), and scanning electron microscopy (SEM). Potentiodynamic polarization experiments in a 3.5 wt. % NaCl environment were performed to assess corrosion behavior and found that the ECAP and subsequent heat treatments greatly improved corrosion resistance. Tests found that a combination of ECAP followed by annealing at 723 K for 12 hours produced a uniform distribution of secondary phases, with resultant smaller corrosion current densities and better electrochemical stability. The results show that the coupled processing methods successfully enhance the corrosion performance of AZ91 Mg alloy, which offers significant findings for its use in corrosive environments.
SN - 1932-6203
ER -