Improving structure and corrosion resistance of micro-arc oxidation coatings formed on aluminum alloy with the addition of La2O3
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Biao Yang
,
Jie Hu
Abstract
Ceramic coatings were prepared on 6061 aluminum alloy in electrolytes containing La2O3 particles using the micro-arc oxidation technique. The main work focuses on the microstructure, phase composition, elemental distribution and corrosion resistance of micro-arc oxidation coatings. The results showed that the addition of La2O3 increased the oxidation voltage and promoted the formation rate. Scanning electron microscopy observations indicated that the quantity of discharge micropores decreased and the thickness increased, and thus, the microhardness increased. The X-ray diffraction results showed that the coatings mainly consisted of γ-Al2O3, α-Al2O3 and SiO2. Electrochemical corrosion tests showed that the corrosion resistance of the coated sample with La2O3 increased greatly because the addition of La2O3 significantly reduced the micropores of the coating surface and made the coating thicker, smoother and harder. Hence, the addition of La2O3 can optimize the structure of the micro-arc oxidation coating and improve its corrosion resistance.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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© 2022 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original Papers
- Modulated dilatometry as a tool for simultaneous study of vacancy formation and migration
- Improving structure and corrosion resistance of micro-arc oxidation coatings formed on aluminum alloy with the addition of La2O3
- Effect of trace Sc and Zr on microstructure and properties of as-cast 5182 aluminum alloy
- The recrystallization-assisted reduction in mechanical anisotropy of Al–Zn–Mg–Cu–Zr–Mn alloys
- Wear behavior and microstructural transformation of single fcc phase AlCoCrFeNi high-entropy alloy at elevated temperatures
- Microstructures and mechanical properties of AF1410 steel processed by vacuum electron beam welding with multiple beams
- News
- DGM – Deutsche Gesellschaft für Materialkunde
Articles in the same Issue
- Frontmatter
- Original Papers
- Modulated dilatometry as a tool for simultaneous study of vacancy formation and migration
- Improving structure and corrosion resistance of micro-arc oxidation coatings formed on aluminum alloy with the addition of La2O3
- Effect of trace Sc and Zr on microstructure and properties of as-cast 5182 aluminum alloy
- The recrystallization-assisted reduction in mechanical anisotropy of Al–Zn–Mg–Cu–Zr–Mn alloys
- Wear behavior and microstructural transformation of single fcc phase AlCoCrFeNi high-entropy alloy at elevated temperatures
- Microstructures and mechanical properties of AF1410 steel processed by vacuum electron beam welding with multiple beams
- News
- DGM – Deutsche Gesellschaft für Materialkunde
