Yujie Wang, Qingxia Zhang, Peng Zhang, Yunhui Du, Kun Liu, Pengfei He, Changqing Li
{"title":"MgF2/MgO质量比对镁合金微弧氧化涂层组织及腐蚀性能的影响","authors":"Yujie Wang, Qingxia Zhang, Peng Zhang, Yunhui Du, Kun Liu, Pengfei He, Changqing Li","doi":"10.1007/s11837-025-07354-7","DOIUrl":null,"url":null,"abstract":"<div><p>Micro-arc oxidation coatings with different MgF<sub>2</sub>/MgO mass ratios were fabricated on magnesium alloys in KF-KOH electrolyte. The effects of mass ratio on the microstructure and corrosion resistance of coatings were studied, and the results showed that the thickness of compact layer first increases and then decreases with the mass ratio of MgF<sub>2</sub>/MgO varying from 0.1 to 7.6. As the mass ratio of MgF<sub>2</sub>/MgO reaches 0.9, MgO and MgF<sub>2</sub> phases are interlaced and uniformly distributed in coatings. The microstructure of the coating with MgF<sub>2</sub>/MgO of 0.9 effectively utilizes the blocking and preheating effects between MgF<sub>2</sub> and MgO, inhibiting the intense eruption of breakdown melt and promoting the growth of compact layers. Therefore, the coating possesses the thickest compact layer (~ 3.5 μm). Electrochemical tests reveal that the coating with MgF<sub>2</sub>/MgO of 0.9 exhibits the best corrosion resistance with the corrosion potential of – 596 mV, which is 907 mV and 887 mV larger than those of the coatings with MgF<sub>2</sub>/MgO of 0.1 and 7.6, respectively. Furthermore, electrochemical impedance spectroscopy measurements showed that the coating with MgF<sub>2</sub>/MgO of 0.9 has a higher impedance modulus. Its impedance of the compact layer increases to ~ 6 times compared to those of the coatings with MgF<sub>2</sub>/MgO of 0.1 and 7.6, respectively.</p></div>","PeriodicalId":605,"journal":{"name":"JOM","volume":"77 6","pages":"4557 - 4567"},"PeriodicalIF":2.1000,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Influence of MgF2/MgO Mass Ratios on the Microstructure and Corrosion Properties of Micro-arc Oxidation Coatings on Magnesium Alloys\",\"authors\":\"Yujie Wang, Qingxia Zhang, Peng Zhang, Yunhui Du, Kun Liu, Pengfei He, Changqing Li\",\"doi\":\"10.1007/s11837-025-07354-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Micro-arc oxidation coatings with different MgF<sub>2</sub>/MgO mass ratios were fabricated on magnesium alloys in KF-KOH electrolyte. The effects of mass ratio on the microstructure and corrosion resistance of coatings were studied, and the results showed that the thickness of compact layer first increases and then decreases with the mass ratio of MgF<sub>2</sub>/MgO varying from 0.1 to 7.6. As the mass ratio of MgF<sub>2</sub>/MgO reaches 0.9, MgO and MgF<sub>2</sub> phases are interlaced and uniformly distributed in coatings. The microstructure of the coating with MgF<sub>2</sub>/MgO of 0.9 effectively utilizes the blocking and preheating effects between MgF<sub>2</sub> and MgO, inhibiting the intense eruption of breakdown melt and promoting the growth of compact layers. Therefore, the coating possesses the thickest compact layer (~ 3.5 μm). Electrochemical tests reveal that the coating with MgF<sub>2</sub>/MgO of 0.9 exhibits the best corrosion resistance with the corrosion potential of – 596 mV, which is 907 mV and 887 mV larger than those of the coatings with MgF<sub>2</sub>/MgO of 0.1 and 7.6, respectively. Furthermore, electrochemical impedance spectroscopy measurements showed that the coating with MgF<sub>2</sub>/MgO of 0.9 has a higher impedance modulus. Its impedance of the compact layer increases to ~ 6 times compared to those of the coatings with MgF<sub>2</sub>/MgO of 0.1 and 7.6, respectively.</p></div>\",\"PeriodicalId\":605,\"journal\":{\"name\":\"JOM\",\"volume\":\"77 6\",\"pages\":\"4557 - 4567\"},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2025-04-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"JOM\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11837-025-07354-7\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"JOM","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11837-025-07354-7","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Influence of MgF2/MgO Mass Ratios on the Microstructure and Corrosion Properties of Micro-arc Oxidation Coatings on Magnesium Alloys
Micro-arc oxidation coatings with different MgF2/MgO mass ratios were fabricated on magnesium alloys in KF-KOH electrolyte. The effects of mass ratio on the microstructure and corrosion resistance of coatings were studied, and the results showed that the thickness of compact layer first increases and then decreases with the mass ratio of MgF2/MgO varying from 0.1 to 7.6. As the mass ratio of MgF2/MgO reaches 0.9, MgO and MgF2 phases are interlaced and uniformly distributed in coatings. The microstructure of the coating with MgF2/MgO of 0.9 effectively utilizes the blocking and preheating effects between MgF2 and MgO, inhibiting the intense eruption of breakdown melt and promoting the growth of compact layers. Therefore, the coating possesses the thickest compact layer (~ 3.5 μm). Electrochemical tests reveal that the coating with MgF2/MgO of 0.9 exhibits the best corrosion resistance with the corrosion potential of – 596 mV, which is 907 mV and 887 mV larger than those of the coatings with MgF2/MgO of 0.1 and 7.6, respectively. Furthermore, electrochemical impedance spectroscopy measurements showed that the coating with MgF2/MgO of 0.9 has a higher impedance modulus. Its impedance of the compact layer increases to ~ 6 times compared to those of the coatings with MgF2/MgO of 0.1 and 7.6, respectively.
期刊介绍：
JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.
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