Microstructural characterization of corrosion resistant Zn–15Al–6Mg–0.4Si galvanized coating
A complex microstructure of the Zn–15Al–6Mg–0.4Si coating layer with excellent hardness and corrosion resistance was investigated by performing thermodynamic calculations, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The inhibition layer with a thickness of...
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Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424028977 |
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| author | Yoonje Sung Changmin Kang Junho Lee Seonghyun Park Sang-Hwa Lee Jae-Taek Im Seok-Jae Lee HeeJin Jang Jae-Gil Jung |
| author_facet | Yoonje Sung Changmin Kang Junho Lee Seonghyun Park Sang-Hwa Lee Jae-Taek Im Seok-Jae Lee HeeJin Jang Jae-Gil Jung |
| author_sort | Yoonje Sung |
| collection | DOAJ |
| description | A complex microstructure of the Zn–15Al–6Mg–0.4Si coating layer with excellent hardness and corrosion resistance was investigated by performing thermodynamic calculations, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The inhibition layer with a thickness of ∼1 μm consisted of submicrometer-sized monoclinic Fe4Al13 particles (containing Si and Zn atoms) epitaxially grown on a steel substrate. The solidifying layer contained three primary phases (Mg2Si, Al, and MgZn2) as well as the Al/Zn eutectoid and Zn/MgZn2/Al ternary eutectic phases. Crystallographic analysis data revealed the serial formation of the Fe4Al13, Mg2Si, and Al phases via heterogeneous nucleation. The primary Al particles (including 37 wt% Zn and 4 wt% Mg) included multiple Zn and MgZn2 precipitates and were surrounded by Al/Zn eutectoid phases (containing ∼70 wt% Zn). The primary MgZn2 phase was generated after the Mg2Si phase was partially transformed into the Mg2Zn11 phase. A Zn/MgZn2/Al ternary eutectic microstructure with a spacing of 1.0 μm was formed during the final solidification stage. The Zn–15Al–6Mg–0.4Si coating exhibited high hardness and low corrosion rate in a 3.5 wt% NaCl solution as compared with those of the coatings with lower Al and Mg contents. |
| format | Article |
| id | doaj-art-682fd34940c6447fbafc9031e653485d |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-682fd34940c6447fbafc9031e653485d2025-01-19T06:25:25ZengElsevierJournal of Materials Research and Technology2238-78542025-01-0134738747Microstructural characterization of corrosion resistant Zn–15Al–6Mg–0.4Si galvanized coatingYoonje Sung0Changmin Kang1Junho Lee2Seonghyun Park3Sang-Hwa Lee4Jae-Taek Im5Seok-Jae Lee6HeeJin Jang7Jae-Gil Jung8Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju, 51508, Republic of KoreaDepartment of Materials Science and Engineering, Chosun University, Gwangju, 61452, Republic of KoreaDivision of Advanced Materials Engineering, Jeonbuk National University, Jeonju, 51508, Republic of KoreaDivision of Advanced Materials Engineering, Jeonbuk National University, Jeonju, 51508, Republic of KoreaDivision of Advanced Materials Engineering, Jeonbuk National University, Jeonju, 51508, Republic of KoreaKG Steel Institute of Technology, Dangjin, 31719, Republic of KoreaDivision of Advanced Materials Engineering, Jeonbuk National University, Jeonju, 51508, Republic of Korea; Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of KoreaDepartment of Materials Science and Engineering, Chosun University, Gwangju, 61452, Republic of Korea; Corresponding author.Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju, 51508, Republic of Korea; Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea; Corresponding author. Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju, 51508, Republic of Korea.A complex microstructure of the Zn–15Al–6Mg–0.4Si coating layer with excellent hardness and corrosion resistance was investigated by performing thermodynamic calculations, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The inhibition layer with a thickness of ∼1 μm consisted of submicrometer-sized monoclinic Fe4Al13 particles (containing Si and Zn atoms) epitaxially grown on a steel substrate. The solidifying layer contained three primary phases (Mg2Si, Al, and MgZn2) as well as the Al/Zn eutectoid and Zn/MgZn2/Al ternary eutectic phases. Crystallographic analysis data revealed the serial formation of the Fe4Al13, Mg2Si, and Al phases via heterogeneous nucleation. The primary Al particles (including 37 wt% Zn and 4 wt% Mg) included multiple Zn and MgZn2 precipitates and were surrounded by Al/Zn eutectoid phases (containing ∼70 wt% Zn). The primary MgZn2 phase was generated after the Mg2Si phase was partially transformed into the Mg2Zn11 phase. A Zn/MgZn2/Al ternary eutectic microstructure with a spacing of 1.0 μm was formed during the final solidification stage. The Zn–15Al–6Mg–0.4Si coating exhibited high hardness and low corrosion rate in a 3.5 wt% NaCl solution as compared with those of the coatings with lower Al and Mg contents.http://www.sciencedirect.com/science/article/pii/S2238785424028977Hot-dip galvanizationZn–Al–Mg–Si coatingMicrostructureTransmission electron microscopyCorrosion |
| spellingShingle | Yoonje Sung Changmin Kang Junho Lee Seonghyun Park Sang-Hwa Lee Jae-Taek Im Seok-Jae Lee HeeJin Jang Jae-Gil Jung Microstructural characterization of corrosion resistant Zn–15Al–6Mg–0.4Si galvanized coating Journal of Materials Research and Technology Hot-dip galvanization Zn–Al–Mg–Si coating Microstructure Transmission electron microscopy Corrosion |
| title | Microstructural characterization of corrosion resistant Zn–15Al–6Mg–0.4Si galvanized coating |
| title_full | Microstructural characterization of corrosion resistant Zn–15Al–6Mg–0.4Si galvanized coating |
| title_fullStr | Microstructural characterization of corrosion resistant Zn–15Al–6Mg–0.4Si galvanized coating |
| title_full_unstemmed | Microstructural characterization of corrosion resistant Zn–15Al–6Mg–0.4Si galvanized coating |
| title_short | Microstructural characterization of corrosion resistant Zn–15Al–6Mg–0.4Si galvanized coating |
| title_sort | microstructural characterization of corrosion resistant zn 15al 6mg 0 4si galvanized coating |
| topic | Hot-dip galvanization Zn–Al–Mg–Si coating Microstructure Transmission electron microscopy Corrosion |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424028977 |
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