Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy

To improve the corrosion performance of magnesium alloys in the marine environment, the MAO, MAO−Cu2CO3(OH)2·H2O and MAO−Cu2P2O<su...

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Main Authors:	Yuhong Yao, Wei Yang, Dongjie Liu, Wei Gao, Jian Chen
Format:	Article
Language:	English
Published:	MDPI AG 2020-01-01
Series:	Materials
Subjects:	magnesium alloy mao coating corrosion behavior stratification phenomena marine environments
Online Access:	https://www.mdpi.com/1996-1944/13/2/345

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record_format	Article
spelling	doaj-411a322bdd174d059ca57fc06e40fa082020-11-25T02:20:43ZengMDPI AGMaterials1996-19442020-01-0113234510.3390/ma13020345ma13020345Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium AlloyYuhong Yao0Wei Yang1Dongjie Liu2Wei Gao3Jian Chen4School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710032, ChinaSchool of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710032, ChinaSchool of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710032, ChinaSchool of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710032, ChinaTo improve the corrosion performance of magnesium alloys in the marine environment, the MAO, MAO−Cu<sub>2</sub>CO<sub>3</sub>(OH)<sub>2</sub>·H<sub>2</sub>O and MAO−Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> ceramic coatings were deposited on AZ91D magnesium alloys in basic electrolyte and the discoloration mechanism of the Cu-doped MAO coatings and the corrosion behavior of the three MAO coatings in the artificial seawater solution were investigated by SEM, EDS and XPS. The results indicated that the formation and discoloration mechanism of the brown MAO ceramic coatings were attributable to the formation of Cu<sub>2</sub>O in the coatings. Though the three MAO coatings had a certain protective effect against the corrosion of AZ91D substrate in the artificial seawater, the distinctive stratification phenomenon was found on the MAO−Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> coated sample and the corrosion model of the MAO−Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> coatings in the immersion experiment was established. Therefore, the brown Cu-doped MAO coatings were speculated to significantly reduce the risk of the magnesium parts in marine environments.https://www.mdpi.com/1996-1944/13/2/345magnesium alloymao coatingcorrosion behaviorstratification phenomenamarine environments
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Yuhong Yao Wei Yang Dongjie Liu Wei Gao Jian Chen
spellingShingle	Yuhong Yao Wei Yang Dongjie Liu Wei Gao Jian Chen Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy Materials magnesium alloy mao coating corrosion behavior stratification phenomena marine environments
author_facet	Yuhong Yao Wei Yang Dongjie Liu Wei Gao Jian Chen
author_sort	Yuhong Yao
title	Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy
title_short	Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy
title_full	Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy
title_fullStr	Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy
title_full_unstemmed	Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy
title_sort	preparation and corrosion behavior in marine environment of mao coatings on magnesium alloy
publisher	MDPI AG
series	Materials
issn	1996-1944
publishDate	2020-01-01
description	To improve the corrosion performance of magnesium alloys in the marine environment, the MAO, MAO−Cu<sub>2</sub>CO<sub>3</sub>(OH)<sub>2</sub>·H<sub>2</sub>O and MAO−Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> ceramic coatings were deposited on AZ91D magnesium alloys in basic electrolyte and the discoloration mechanism of the Cu-doped MAO coatings and the corrosion behavior of the three MAO coatings in the artificial seawater solution were investigated by SEM, EDS and XPS. The results indicated that the formation and discoloration mechanism of the brown MAO ceramic coatings were attributable to the formation of Cu<sub>2</sub>O in the coatings. Though the three MAO coatings had a certain protective effect against the corrosion of AZ91D substrate in the artificial seawater, the distinctive stratification phenomenon was found on the MAO−Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> coated sample and the corrosion model of the MAO−Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> coatings in the immersion experiment was established. Therefore, the brown Cu-doped MAO coatings were speculated to significantly reduce the risk of the magnesium parts in marine environments.
topic	magnesium alloy mao coating corrosion behavior stratification phenomena marine environments
url	https://www.mdpi.com/1996-1944/13/2/345
work_keys_str_mv	AT yuhongyao preparationandcorrosionbehaviorinmarineenvironmentofmaocoatingsonmagnesiumalloy AT weiyang preparationandcorrosionbehaviorinmarineenvironmentofmaocoatingsonmagnesiumalloy AT dongjieliu preparationandcorrosionbehaviorinmarineenvironmentofmaocoatingsonmagnesiumalloy AT weigao preparationandcorrosionbehaviorinmarineenvironmentofmaocoatingsonmagnesiumalloy AT jianchen preparationandcorrosionbehaviorinmarineenvironmentofmaocoatingsonmagnesiumalloy
_version_	1724870400228196352

Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy

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