Study on Growth Mechanism and Characteristics of Zirconium Alloy Micro-Arc Oxidation Film
Ceramic coatings on R60705 zirconium alloy were prepared on the surface by the micro-arc oxidation (MAO) technique in electrolytes containing Na<sub>2</sub>SiO<sub>3</sub>, NaOH, and Na<sub>2</sub>EDTA. The growth behavior of the MAO ceramic coatings at different...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-05-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/13/5/935 |
| _version_ | 1797599058621104128 |
|---|---|
| author | Mingli Wang Kai Lv Zhaoxin Du Weidong Chen Pengfei Ji Wei Wang Zhi Pang |
| author_facet | Mingli Wang Kai Lv Zhaoxin Du Weidong Chen Pengfei Ji Wei Wang Zhi Pang |
| author_sort | Mingli Wang |
| collection | DOAJ |
| description | Ceramic coatings on R60705 zirconium alloy were prepared on the surface by the micro-arc oxidation (MAO) technique in electrolytes containing Na<sub>2</sub>SiO<sub>3</sub>, NaOH, and Na<sub>2</sub>EDTA. The growth behavior of the MAO ceramic coatings at different stages, including growth rate, microstructure, and phase composition, was investigated using the method of direct observation of the boundary area. The results showed that the growth of the MAO coatings on R60705 zirconium alloy occurred in both inward and outward directions. At an oxidation time of 5 min, the thickness of the oxidation layer increased fastest, reaching 103.43 μm, with a growth rate of 0.345 μm/s. After 5 min, the growth rate decreased and tended to level off around 15 min, with a thickness and growth rate of 162.7 μm and 0.181 μm/s, respectively. The total thickness of the coatings continuously increased throughout the process, with the outward growth thickness always higher than the inward growth thickness. The composition of the zirconium alloy micro-arc oxidation coatings mainly consisted of monoclinic zirconia (m-ZrO<sub>2</sub>), tetragonal zirconia (t-ZrO<sub>2</sub>), and a small amount of SiO<sub>2</sub>. The main elements in the coatings were Zr, O, and Si. The corrosion resistance of the zirconium alloy micro-arc oxidation coatings increased first and then decreased with increasing oxidation time, with a corrosion current density of 8.876 × 10<sup>−9</sup> A·cm<sup>−2</sup> at 15 min, indicating the best corrosion resistance. |
| first_indexed | 2024-03-11T03:29:44Z |
| format | Article |
| id | doaj.art-660b414e1c514cd9a18a6abbf7cf347f |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T03:29:44Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-660b414e1c514cd9a18a6abbf7cf347f2023-11-18T02:27:55ZengMDPI AGMetals2075-47012023-05-0113593510.3390/met13050935Study on Growth Mechanism and Characteristics of Zirconium Alloy Micro-Arc Oxidation FilmMingli Wang0Kai Lv1Zhaoxin Du2Weidong Chen3Pengfei Ji4Wei Wang5Zhi Pang6School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCeramic coatings on R60705 zirconium alloy were prepared on the surface by the micro-arc oxidation (MAO) technique in electrolytes containing Na<sub>2</sub>SiO<sub>3</sub>, NaOH, and Na<sub>2</sub>EDTA. The growth behavior of the MAO ceramic coatings at different stages, including growth rate, microstructure, and phase composition, was investigated using the method of direct observation of the boundary area. The results showed that the growth of the MAO coatings on R60705 zirconium alloy occurred in both inward and outward directions. At an oxidation time of 5 min, the thickness of the oxidation layer increased fastest, reaching 103.43 μm, with a growth rate of 0.345 μm/s. After 5 min, the growth rate decreased and tended to level off around 15 min, with a thickness and growth rate of 162.7 μm and 0.181 μm/s, respectively. The total thickness of the coatings continuously increased throughout the process, with the outward growth thickness always higher than the inward growth thickness. The composition of the zirconium alloy micro-arc oxidation coatings mainly consisted of monoclinic zirconia (m-ZrO<sub>2</sub>), tetragonal zirconia (t-ZrO<sub>2</sub>), and a small amount of SiO<sub>2</sub>. The main elements in the coatings were Zr, O, and Si. The corrosion resistance of the zirconium alloy micro-arc oxidation coatings increased first and then decreased with increasing oxidation time, with a corrosion current density of 8.876 × 10<sup>−9</sup> A·cm<sup>−2</sup> at 15 min, indicating the best corrosion resistance.https://www.mdpi.com/2075-4701/13/5/935micro-arc oxidation (MAO)zirconium alloysilicate electrolytegrowth way |
| spellingShingle | Mingli Wang Kai Lv Zhaoxin Du Weidong Chen Pengfei Ji Wei Wang Zhi Pang Study on Growth Mechanism and Characteristics of Zirconium Alloy Micro-Arc Oxidation Film Metals micro-arc oxidation (MAO) zirconium alloy silicate electrolyte growth way |
| title | Study on Growth Mechanism and Characteristics of Zirconium Alloy Micro-Arc Oxidation Film |
| title_full | Study on Growth Mechanism and Characteristics of Zirconium Alloy Micro-Arc Oxidation Film |
| title_fullStr | Study on Growth Mechanism and Characteristics of Zirconium Alloy Micro-Arc Oxidation Film |
| title_full_unstemmed | Study on Growth Mechanism and Characteristics of Zirconium Alloy Micro-Arc Oxidation Film |
| title_short | Study on Growth Mechanism and Characteristics of Zirconium Alloy Micro-Arc Oxidation Film |
| title_sort | study on growth mechanism and characteristics of zirconium alloy micro arc oxidation film |
| topic | micro-arc oxidation (MAO) zirconium alloy silicate electrolyte growth way |
| url | https://www.mdpi.com/2075-4701/13/5/935 |
| work_keys_str_mv | AT mingliwang studyongrowthmechanismandcharacteristicsofzirconiumalloymicroarcoxidationfilm AT kailv studyongrowthmechanismandcharacteristicsofzirconiumalloymicroarcoxidationfilm AT zhaoxindu studyongrowthmechanismandcharacteristicsofzirconiumalloymicroarcoxidationfilm AT weidongchen studyongrowthmechanismandcharacteristicsofzirconiumalloymicroarcoxidationfilm AT pengfeiji studyongrowthmechanismandcharacteristicsofzirconiumalloymicroarcoxidationfilm AT weiwang studyongrowthmechanismandcharacteristicsofzirconiumalloymicroarcoxidationfilm AT zhipang studyongrowthmechanismandcharacteristicsofzirconiumalloymicroarcoxidationfilm |