TY - GEN
T1 - Investigating the Effect of Calcium Alloying and Electrolyte Medium on the Corrosion Behavior of AZ31 Mg Alloy
AU - Chaudry, Umer Masood
AU - Farooq, Ameeq
AU - Ahn, Ho Seon
AU - Hamad, Kotiba
AU - Jun, Tea Sung
N1 - Publisher Copyright:
© 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
PY - 2023
Y1 - 2023
N2 - Magnesium (Mg) has the lowest density among all the structural materials (Al, Fe); however, the diverse applications of Mg have been hampered by its intrinsic brittleness at room temperature and high corrosion susceptibility. Hence, enormous efforts have been made to design the highly ductile corrosion resistant Mg by alloying or other techniques to catapult its utilization. AZ31 is the most commercially used Mg alloy in the transportation sector, yet its high corrosive nature poses a significant disadvantage among other materials. In this study, the effect of calcium on microstructure and corrosion characteristics of AZ31 were investigated. Microstructure was characterized by electron probe microanalysis, scanning electron microscopy and electron back-scattered diffraction. For investigating the corrosion behavior, open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy were analyzed in NaCl and Na2SO4 electrolyte. The microstructure revealed the formation of (Mg, Al)2Ca in AZ31–0.5Ca. The corrosion rates were observed to be significantly reduced for AZ31–0.5Ca as compared to AZ31 (74.53, 67.33 and 29.01, 49.56 mpy for AZ31 and AZ31–0.5Ca in NaCl and Na2SO4 electrolyte, respectively). Improved corrosion resistance was attributed to segregation of aluminum with calcium to form (Mg, Al)2Ca which reduced β–Mg17–Al12 area fraction.
AB - Magnesium (Mg) has the lowest density among all the structural materials (Al, Fe); however, the diverse applications of Mg have been hampered by its intrinsic brittleness at room temperature and high corrosion susceptibility. Hence, enormous efforts have been made to design the highly ductile corrosion resistant Mg by alloying or other techniques to catapult its utilization. AZ31 is the most commercially used Mg alloy in the transportation sector, yet its high corrosive nature poses a significant disadvantage among other materials. In this study, the effect of calcium on microstructure and corrosion characteristics of AZ31 were investigated. Microstructure was characterized by electron probe microanalysis, scanning electron microscopy and electron back-scattered diffraction. For investigating the corrosion behavior, open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy were analyzed in NaCl and Na2SO4 electrolyte. The microstructure revealed the formation of (Mg, Al)2Ca in AZ31–0.5Ca. The corrosion rates were observed to be significantly reduced for AZ31–0.5Ca as compared to AZ31 (74.53, 67.33 and 29.01, 49.56 mpy for AZ31 and AZ31–0.5Ca in NaCl and Na2SO4 electrolyte, respectively). Improved corrosion resistance was attributed to segregation of aluminum with calcium to form (Mg, Al)2Ca which reduced β–Mg17–Al12 area fraction.
KW - AZ31–0.5Ca
KW - Electrochemical impedance spectroscopy
KW - Electron back-scattered diffraction
KW - Magnesium
KW - Potentiodynamic polarization
UR - https://www.scopus.com/pages/publications/85168758070
U2 - 10.1007/978-981-19-9267-4_84
DO - 10.1007/978-981-19-9267-4_84
M3 - Conference contribution
AN - SCOPUS:85168758070
SN - 9789811992667
T3 - Springer Proceedings in Physics
SP - 851
EP - 858
BT - Proceedings of the Green Materials and Electronic Packaging Interconnect Technology Symposium - EPITS 2022
A2 - Mohd Salleh, Mohd Arif Anuar
A2 - Che Halin, Dewi Suriyani
A2 - Abdul Razak, Kamrosni
A2 - Ramli, Mohd Izrul Izwan
PB - Springer Science and Business Media Deutschland GmbH
T2 - Green Materials and Electronic Packaging Interconnect Technology Symposium, EPITS 2022
Y2 - 14 September 2022 through 15 September 2022
ER -