Effect of process parameters on coating of a Zn thin film on AZ91D magnesium alloy
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There is an increased interest in the development of lightweight materials with corrosion-resistant coatings in industries such as aerospace, automobile, ship, and electronics. In this study, a Zn thin film is fabricated on a magnesium alloy (AZ91D) sub-strate by thermo-electron activated ion plating, which is a modified physical vapor deposition (PVD) method that is environmentally friendly and capable of controlling nano-phase particles. The effect of gas pressure and substrate bias voltage on the morphology and crystal orientation of the Zn thin film was analyzed by X-ray diffraction and field emission scanning electron microscopy (SEM). Additionally, the corrosion behavior of the Zn thin film was evaluated by an electrochemical anodic polarization test using a deaerat-ed 3% NaCl solution. All the deposited Zn films showed good corrosion resistance as compared to the bare substrate of AZ91D. It was observed that the morphology of the Zn film was changed from column structure to granular structure by gas pressure. The mor-phology of the films was affected not only by Ar gas pressure but also by the substrate bias voltage. The effect of increasing bias voltage was similar to reducing gas pressure. Finally, the corrosion resistance of AZ91D was greatly improved by the Zn thin film obtained by optimizing the crystal orientation and the morphology through the plasma ion plating technique.
Abstract
There is an increased interest in the development of lightweight materials with corrosion-resistant coatings in industries such as aerospace, automobile, ship, and electronics. In this study, a Zn thin film is fabricated on a magnesium alloy (AZ91D) sub-strate by thermo-electron activated ion plating, which is a modified physical vapor deposition (PVD) method that is environmentally friendly and capable of controlling nano-phase particles. The effect of gas pressure and substrate bias voltage on the morphology and crystal orientation of the Zn thin film was analyzed by X-ray diffraction and field emission scanning electron microscopy (SEM). Additionally, the corrosion behavior of the Zn thin film was evaluated by an electrochemical anodic polarization test using a deaerat-ed 3% NaCl solution. All the deposited Zn films showed good corrosion resistance as compared to the bare substrate of AZ91D. It was observed that the morphology of the Zn film was changed from column structure to granular structure by gas pressure. The mor-phology of the films was affected not only by Ar gas pressure but also by the substrate bias voltage. The effect of increasing bias voltage was similar to reducing gas pressure. Finally, the corrosion resistance of AZ91D was greatly improved by the Zn thin film obtained by optimizing the crystal orientation and the morphology through the plasma ion plating technique.
참고문헌 (20)
- 윤용섭, "초경량성 박용기관을 위한 마그네슘 표면처리", 한국마린엔지니어링학회지, 35(2), pp.252~257 (2011), 한국마린엔지니어링학회
- 김종도, "AZ31 마그네슘합금의 레이저 용접성에 미치는 공정변수의 영향", 한국마린엔지니어링학회지, 32(4), pp.570~577 (2008), 한국마린엔지니어링학회
- X. Zhan, "Prepara-tion and corrosion resistance of a three-layer composite coatings on the Mg alloy", Journal of Alloys and Com-pounds, 774, pp.522~531 (2019)
- Y. Wang, "An organic", inorganic composite multi-layer coating to improve the corrosion resistance of AZ31B Mg alloy, 2019, pp.360, 276~284
- R. C. Zeng, "Corrosion resistance of cerium-doped zinc calcium phosphate chemical conversion coat-ings on AZ31 magnesium alloy", Transaction of Nonfer-rous Metals Society of China, 26(2), pp.472~483 (2016)
- N. V. Phuong, "Enhanced corro-sion performance of magnesium phosphate conversion coating on AZ31 magnesium alloy", Transaction of Non-ferrous Metals Society of China, 27(5), pp.1087~1095 (2017)
- X. B. Chen, "Corrosion Prevention of Magnesium Alloys", pp.282~312 (2013)
- S. Bender, "Fundamentals of Magnesium Alloy Metallurgy", pp.232~265 (2013)
- S. Akavipat, "Effects of iron implantation on the aqueous corro-sion of magnesium", Materials Science and Engineering, 69(2), pp.311~316 (1985)
- X. Wang, "A novel approach to fabricate Zn coating on Mg foam through a modified thermal evaporation technique", Journal of Materials Science & Technology, 34(9), pp.1558~1563 (2018)
- A. Bordbar-Khiabani, "En-hanced corrosion resistance and in-vitro biodegradation of plasma electrolytic oxidation coatings prepared on AZ91 Mg alloy using ZnO nanoparticles-incorporated electro-lyte", Surface and Coatings Technology, 360, pp.153~171 (2019)
- C. Zhao, "Enhanced corrosion resistance and antibacterial property of Zn doped DCPD coating on biodegradable Mg", Mate-rials Letters, 180, pp.42~46 (2016)
- M. J. Brett, "Structural transitions in ballistic aggregation simulation of thin-film growth", Journal of Vacuum Sci-ence & Technology A, 6(3), pp.1749~1751 (1988)
- J. A. Thornton, "Influence of apparatus geometry and dep-osition conditions on the structure and topography of thick sputtered coatings", Journal of Vacuum Science & Tech-nology, 11(4), pp.666~670 (1974)
- M. H. Lee, "Preparation of Al thin films by thermo-electron activation ion plating and their corrosion resistance", Journal of The Japan Institute of Metals, Nippon Kinzoku Gakkaishi, 57(6), pp.686~691 (1993)
- J. A. Thornton, "High rate thick film growth", Annual Review of Materials Science, 7(1), pp.239~260 (1977)
- R. Messier, "Revised structure zone model for thin film physical structure", Journal of Vacuum Science & Technology A : Vacuum, Surfaces, and Films, 2(2), pp.500~503 (1984)
- R. Messier, "Toward quantification of thin film morpholo-gy", Journal of Vacuum Science & Technology A, 4(3), pp.490~495 (1986)
- L. Hultman, "Ar and excess N incorporation in epitaxial TiN films grown by reactive bias sputtering in mixed Ar", N2 and pure N2 discharges, 1989, pp.7(3), 1187~1193
- A. G. Dirks, "Columnar microstructure in vapor-deposited thin films", Thin Solid Films, 47(3), pp.219~233 (1977)