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Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment

The effects of CuSO(4) concentration, voltage and treating time on the hemisphere emissivity and corrosion resistance of AZ31B magnesium-alloy black micro-arc oxidation coatings were studied by orthogonal experiment. The microstructure, phase composition, corrosion resistance and hemisphere emissivi...

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Autores principales: Li, Hongzhan, Wang, Yifei, Geng, Juanjuan, Li, Shaolong, Chen, Yongnan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9853327/
https://www.ncbi.nlm.nih.gov/pubmed/36556561
http://dx.doi.org/10.3390/ma15248755
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author Li, Hongzhan
Wang, Yifei
Geng, Juanjuan
Li, Shaolong
Chen, Yongnan
author_facet Li, Hongzhan
Wang, Yifei
Geng, Juanjuan
Li, Shaolong
Chen, Yongnan
author_sort Li, Hongzhan
collection PubMed
description The effects of CuSO(4) concentration, voltage and treating time on the hemisphere emissivity and corrosion resistance of AZ31B magnesium-alloy black micro-arc oxidation coatings were studied by orthogonal experiment. The microstructure, phase composition, corrosion resistance and hemisphere emissivity of the coating were investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, electrochemical test and infrared emissivity spectrometer, respectively. The results showed that the influences of each factor on corrosion current density and the hemisphere emissivity are as follows: voltage > treating time > CuSO(4) concentration. The black MAO coatings are mainly composed of WO(3), MgAl(2)O(4), CuAl(2)O(4), MgO, CuO and MgF(2). The CuO and CuAl(2)O(4) phases are the main reasons for blackness of the coatings. The coating exhibits the best corrosion resistance under the conditions of CuSO(4) concentration 1.5 g/L, oxidation voltage 500 V and treating time 10 min. Additionally, the variation trends of hemispherical emissivity and roughness of the black MAO coating are the same when the composition of the coatings is similar. When the concentration of CuSO(4) is 1.5 g/L, the oxidation voltage is 450 V and the treatment time is 10 min, the coating with the highest hemispherical emissivity of 0.84 can be obtained.
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spelling pubmed-98533272023-01-21 Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment Li, Hongzhan Wang, Yifei Geng, Juanjuan Li, Shaolong Chen, Yongnan Materials (Basel) Article The effects of CuSO(4) concentration, voltage and treating time on the hemisphere emissivity and corrosion resistance of AZ31B magnesium-alloy black micro-arc oxidation coatings were studied by orthogonal experiment. The microstructure, phase composition, corrosion resistance and hemisphere emissivity of the coating were investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, electrochemical test and infrared emissivity spectrometer, respectively. The results showed that the influences of each factor on corrosion current density and the hemisphere emissivity are as follows: voltage > treating time > CuSO(4) concentration. The black MAO coatings are mainly composed of WO(3), MgAl(2)O(4), CuAl(2)O(4), MgO, CuO and MgF(2). The CuO and CuAl(2)O(4) phases are the main reasons for blackness of the coatings. The coating exhibits the best corrosion resistance under the conditions of CuSO(4) concentration 1.5 g/L, oxidation voltage 500 V and treating time 10 min. Additionally, the variation trends of hemispherical emissivity and roughness of the black MAO coating are the same when the composition of the coatings is similar. When the concentration of CuSO(4) is 1.5 g/L, the oxidation voltage is 450 V and the treatment time is 10 min, the coating with the highest hemispherical emissivity of 0.84 can be obtained. MDPI 2022-12-08 /pmc/articles/PMC9853327/ /pubmed/36556561 http://dx.doi.org/10.3390/ma15248755 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Hongzhan
Wang, Yifei
Geng, Juanjuan
Li, Shaolong
Chen, Yongnan
Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment
title Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment
title_full Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment
title_fullStr Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment
title_full_unstemmed Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment
title_short Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment
title_sort study on microstructure and properties of black micro-arc oxidation coating on az31 magnesium alloy by orthogonal experiment
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9853327/
https://www.ncbi.nlm.nih.gov/pubmed/36556561
http://dx.doi.org/10.3390/ma15248755
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