Effect of V<sub>2</sub>O<sub>5</sub> Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading Voltages
Effect of V<sub>2</sub>O<sub>5</sub> additive in silicate-containing electrolyte on AZ91D magnesium alloys treated by micro-arc oxidation (MAO) technology under different loading voltages was investigated. The results showed that vanadium was well up-taken into the coating ch...
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| Format: | Article |
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MDPI AG
2020-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/9/1146 |
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| author | Zhanying Wang Ying Ma Yushun Wang |
| author_facet | Zhanying Wang Ying Ma Yushun Wang |
| author_sort | Zhanying Wang |
| collection | DOAJ |
| description | Effect of V<sub>2</sub>O<sub>5</sub> additive in silicate-containing electrolyte on AZ91D magnesium alloys treated by micro-arc oxidation (MAO) technology under different loading voltages was investigated. The results showed that vanadium was well up-taken into the coating chemically. Moreover, a new phase of MgV<sub>2</sub>O<sub>4</sub> with spinel structure was obtained in MAO coatings due to V<sub>2</sub>O<sub>5</sub> added into the electrolyte. The MgV<sub>2</sub>O<sub>4</sub> phase was responsible for the coatings exhibiting brown color and also was beneficial to improving the anti-corrosion property. In spotting tests, the corrosion resistances of coatings prepared under the high voltage are about 6–9 times higher than those of the low voltage because of the thicker coatings of the former. In potentiodynamic polarization tests, the coatings’ corrosion resistances were improved with the addition of V<sub>2</sub>O<sub>5</sub>, which was more significant under the low voltage than that under the high voltage. When the concentration of V<sub>2</sub>O<sub>5</sub> was 0.2 g/L, the corrosion current density of the coating was the lowest, which means that the coating’s corrosion resistance under the low voltage is the best. Hence, it is necessary to carry out targeted design of the coating’s microstructure according to the different applications. |
| first_indexed | 2024-03-10T16:53:05Z |
| format | Article |
| id | doaj.art-919adfe4f0c344f3853282294d8280dc |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T16:53:05Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-919adfe4f0c344f3853282294d8280dc2023-11-20T11:14:54ZengMDPI AGMetals2075-47012020-08-01109114610.3390/met10091146Effect of V<sub>2</sub>O<sub>5</sub> Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading VoltagesZhanying Wang0Ying Ma1Yushun Wang2State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaState Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaState Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaEffect of V<sub>2</sub>O<sub>5</sub> additive in silicate-containing electrolyte on AZ91D magnesium alloys treated by micro-arc oxidation (MAO) technology under different loading voltages was investigated. The results showed that vanadium was well up-taken into the coating chemically. Moreover, a new phase of MgV<sub>2</sub>O<sub>4</sub> with spinel structure was obtained in MAO coatings due to V<sub>2</sub>O<sub>5</sub> added into the electrolyte. The MgV<sub>2</sub>O<sub>4</sub> phase was responsible for the coatings exhibiting brown color and also was beneficial to improving the anti-corrosion property. In spotting tests, the corrosion resistances of coatings prepared under the high voltage are about 6–9 times higher than those of the low voltage because of the thicker coatings of the former. In potentiodynamic polarization tests, the coatings’ corrosion resistances were improved with the addition of V<sub>2</sub>O<sub>5</sub>, which was more significant under the low voltage than that under the high voltage. When the concentration of V<sub>2</sub>O<sub>5</sub> was 0.2 g/L, the corrosion current density of the coating was the lowest, which means that the coating’s corrosion resistance under the low voltage is the best. Hence, it is necessary to carry out targeted design of the coating’s microstructure according to the different applications.https://www.mdpi.com/2075-4701/10/9/1146magnesium alloymicro-arc oxidationvanadium pentoxidecorrosion resistance |
| spellingShingle | Zhanying Wang Ying Ma Yushun Wang Effect of V<sub>2</sub>O<sub>5</sub> Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading Voltages Metals magnesium alloy micro-arc oxidation vanadium pentoxide corrosion resistance |
| title | Effect of V<sub>2</sub>O<sub>5</sub> Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading Voltages |
| title_full | Effect of V<sub>2</sub>O<sub>5</sub> Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading Voltages |
| title_fullStr | Effect of V<sub>2</sub>O<sub>5</sub> Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading Voltages |
| title_full_unstemmed | Effect of V<sub>2</sub>O<sub>5</sub> Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading Voltages |
| title_short | Effect of V<sub>2</sub>O<sub>5</sub> Additive on Micro-Arc Oxidation Coatings Fabricated on Magnesium Alloys with Different Loading Voltages |
| title_sort | effect of v sub 2 sub o sub 5 sub additive on micro arc oxidation coatings fabricated on magnesium alloys with different loading voltages |
| topic | magnesium alloy micro-arc oxidation vanadium pentoxide corrosion resistance |
| url | https://www.mdpi.com/2075-4701/10/9/1146 |
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