Deposition of fully dense Al-based coatings via in-situ micro-forging assisted cold spray for excellent corrosion protection of AZ31B magnesium alloy
| Autor: | Xiao-Tao Luo, Guo-Sheng Huang, Yi Ge, Xin Chu, Ying-Kang Wei, Chang-Jiu Li |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Magnesium Mechanical Engineering Metallurgy Alloy Metals and Alloys Gas dynamic cold spray chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Corrosion Coating chemistry Mechanics of Materials Aluminium Materials Chemistry engineering Magnesium alloy 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 806:1116-1126 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.07.279 |
| Popis: | In this work, three types of fully dense aluminum-based (Al) coatings (pure Al, AA2219 and AA6061) were deposited on AZ31B magnesium (Mg) alloy by a recently developed in-situ micro-forging assisted cold spray process. The detailed microstructure, coating adhesion and corrosion protection performance were systematically investigated. Results show that the porosities of the pure Al, AA2219 and AA6061 coatings are as low as 0.34 ± 0.11%, 0.23 ± 0.09% and 0.24 ± 0.08%, respectively. Strong adhesion strength (83.6–91.5 MPa) was achieved for the Al-based coatings due to the in-situ micro-forging induced enhanced mechanical-interlocking between Al-based coating and the magnesium alloy substrate. The corrosion current density of the AZ31B Mg alloy decreases to 1.9–5.8 μA cm−2 from 312.8 μA cm−2 after coated with the Al-based coatings. The long-term corrosion tests further indicate that the Al-based coatings are not aqueous solution permeable during the entire 1000 h immersion, thus provided robust long-term corrosion protection of AZ31B Mg alloy substrate. Moreover, the difference in corrosion resistances among the three Al-based coatings was observed and was further explained based on their unique microstructures arising from the coating deposition process. The present in-situ micro-forging assisted cold spray process shows great potential for economical and effective corrosion protection of magnesium alloy and provides more freedom for industries to design and use magnesium alloy parts. |
| Databáze: | OpenAIRE |
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