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Article

Improved Corrosion Behavior of AZ31 Alloy through ECAP Processing

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Mechanical Engineering Department, College of Engineering-Unaizah, Qassim University, Unaizah 51911, Saudi Arabia
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National Centre for Corrosion Technology, King Abdulaziz City for Science and Technology (KACST), Riyadh 11442, Saudi Arabia
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Materials Science Research Institute, King Abdulaziz City for Science and Technology (KACST), Riyadh 11442, Saudi Arabia
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Production Engineering and Mechanical Design Department, Faculty of Engineering, Port-Said University, Port-Said 42523, Egypt
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Mechanical Engineering Department, The American University in Cairo (AUC), Cairo 11835, Egypt
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Mechanical Engineering Department, Faculty of Engineering, Suez Canal University, Ismailia 41522, Egypt
*
Authors to whom correspondence should be addressed.
Academic Editors: Sebastian Feliú, Jr.
Metals 2021, 11(2), 363; https://doi.org/10.3390/met11020363
Received: 31 January 2021 / Revised: 18 February 2021 / Accepted: 19 February 2021 / Published: 21 February 2021
(This article belongs to the Special Issue Surface Chemistry and Corrosion of Light Alloys)
This study aims to establish the effects of equal channel angular pressing (ECAP) processing on the corrosion behavior and hardness values of the AZ31 Mg alloy. The AZ31 billets were processed through ECAP successfully at 250 °C and their microstructural evolution was studied using optical and field emission scanning electron microscopy. The corrosion resistance of the AZ31 alloy was studied before and after processing through ECAP. The homogeneity of the hardness distribution was studied using both sections cut parallel and perpendicular to the extrusion direction. ECAP processing resulted in highly deformed central regions with elongated grains aligned parallel to the extrusion direction, whereas the peripheral regions showed an ultra-fine-grain recrystallized structure. After processing, small ultra-fine secondary particles were found to be homogeneously dispersed alongside the grain boundaries of the α-Mg matrix. Regarding the corrosion properties, measurements showed that ECAP processing through 1-P and 2-Bc resulted in decreasing their corrosion rate to 67.7% and 78.3%, respectively, of their as-annealed counterpart’s. The corrosion resistance of the ECAPed Mg alloy increased with the number of processing passes. This was due to the refinement of the grain size of the α-Mg matrix and secondary phases till ultra-fine size, caused by the accumulation of strain during processing. On the other hand, ECAP processing through 2-Bc resulted in increasing the Vickers hardness values by 132% and 71.8% at the peripheral and central areas, respectively, compared to the as-annealed counterpart. View Full-Text
Keywords: Mg alloys; corrosion behavior; Tafel plots; electrochemical impedance spectroscopy; ECAP; ultrafine-grained; severe plastic deformation Mg alloys; corrosion behavior; Tafel plots; electrochemical impedance spectroscopy; ECAP; ultrafine-grained; severe plastic deformation
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MDPI and ACS Style

Alateyah, A.I.; Aljohani, T.A.; Alawad, M.O.; El-Hafez, H.A.; Almutairi, A.N.; Alharbi, E.S.; Alhamada, R.; El-Garaihy, B.W.; El-Garaihy, W.H. Improved Corrosion Behavior of AZ31 Alloy through ECAP Processing. Metals 2021, 11, 363. https://doi.org/10.3390/met11020363

AMA Style

Alateyah AI, Aljohani TA, Alawad MO, El-Hafez HA, Almutairi AN, Alharbi ES, Alhamada R, El-Garaihy BW, El-Garaihy WH. Improved Corrosion Behavior of AZ31 Alloy through ECAP Processing. Metals. 2021; 11(2):363. https://doi.org/10.3390/met11020363

Chicago/Turabian Style

Alateyah, A. I., Talal A. Aljohani, Majed O. Alawad, H. A. El-Hafez, A. N. Almutairi, E. S. Alharbi, R. Alhamada, B. W. El-Garaihy, and W. H. El-Garaihy 2021. "Improved Corrosion Behavior of AZ31 Alloy through ECAP Processing" Metals 11, no. 2: 363. https://doi.org/10.3390/met11020363

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