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Influence of second phase on corrosion performance and formation mechanism of PEO coating on AZ91 Mg alloy
Chen, Yan; Yang, Yange; Zhang, Wei; Zhang, Tao; Wang, Fuhui; Zhang, W; Zhang, T (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Wencui RD 62, Shenyang 110016, Peoples R China.
2017-09-25
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume718Pages:92-103
AbstractPlasma electrolytic oxidation (PEO) treatment has been performed on AZ91 Mg alloy in a silicate-containing alkaline electrolyte to disclose the relationship between second phase and resultant coating. The morphology and corrosion behavior were characterized for PEO coatings on three different AZ91 substrates with microstructures altered by heat treatment. In the presence of beta phase, both the substrate and PEO coating exhibit enhanced corrosion resistance with finer and more evenly distributed b phase precipitates. In the as-cast AZ91, the anodized coating displays chemically and morphologically discontinuity on a and b phase with very coarse and defective regions on two-phase boundaries. In aged AZ91 with nano-sized b phase precipitates, the PEO coating shows no obvious difference on two-phase boundaries and is more homogenous with fewer pores and defects. The residual stress values given by Xray diffraction ( XRD) analysis indicate that PEO coating on aged AZ91 with finest b phase has the smallest stress which might be the reason for its improved corrosion resistance under synergetic effect of corrosive ions and residual stress. Conversely, in the absence of b phase, i.e. after solid solution treatment, the coating is characterized by the most inhomogeneous microstructure and the worst corrosion resistance, presumably owing to the absence of protective aluminum-containing oxides in the coating and more severe localized oxidation behavior adjacent to AlMn phase. Understanding the effect of second phase on PEO coating will enable us to optimize porous oxide structures for improved corrosion resistance by properly altering the substrate microstructure. (C) 2017 Published by Elsevier B.V.; Plasma electrolytic oxidation (PEO) treatment has been performed on AZ91 Mg alloy in a silicate-containing alkaline electrolyte to disclose the relationship between second phase and resultant coating. The morphology and corrosion behavior were characterized for PEO coatings on three different AZ91 substrates with microstructures altered by heat treatment. In the presence of beta phase, both the substrate and PEO coating exhibit enhanced corrosion resistance with finer and more evenly distributed b phase precipitates. In the as-cast AZ91, the anodized coating displays chemically and morphologically discontinuity on a and b phase with very coarse and defective regions on two-phase boundaries. In aged AZ91 with nano-sized b phase precipitates, the PEO coating shows no obvious difference on two-phase boundaries and is more homogenous with fewer pores and defects. The residual stress values given by Xray diffraction ( XRD) analysis indicate that PEO coating on aged AZ91 with finest b phase has the smallest stress which might be the reason for its improved corrosion resistance under synergetic effect of corrosive ions and residual stress. Conversely, in the absence of b phase, i.e. after solid solution treatment, the coating is characterized by the most inhomogeneous microstructure and the worst corrosion resistance, presumably owing to the absence of protective aluminum-containing oxides in the coating and more severe localized oxidation behavior adjacent to AlMn phase. Understanding the effect of second phase on PEO coating will enable us to optimize porous oxide structures for improved corrosion resistance by properly altering the substrate microstructure. (C) 2017 Published by Elsevier B.V.
description.department[chen, yan ; yang, yange ; zhang, wei ; zhang, tao ; wang, fuhui] chinese acad sci, inst met res, lab corros & protect, wencui rd 62, shenyang 110016, peoples r china ; [chen, yan] univ chinese acad sci, yuquan rd 19, beijing 110049, peoples r china ; [zhang, tao ; wang, fuhui] northeastern univ, sch mat sci & engn, key lab anisotropy & texture mat moe, wenhua rd 3-11, shenyang 110819, peoples r china
KeywordMagnesium Plasma Electrolytic Oxidation Second Phase
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationProgram of Outstanding Young Scholars; Program of Hundred Talents of Chinese Academy of Sciences; National Natural Science Foundation of China [51531007]; Chinese Academy of Sciences; German Academic Exchange Service
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78009
Collection中国科学院金属研究所
Corresponding AuthorZhang, W; Zhang, T (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Wencui RD 62, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Chen, Yan,Yang, Yange,Zhang, Wei,et al. Influence of second phase on corrosion performance and formation mechanism of PEO coating on AZ91 Mg alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2017,718:92-103.
APA Chen, Yan.,Yang, Yange.,Zhang, Wei.,Zhang, Tao.,Wang, Fuhui.,...&Zhang, T .(2017).Influence of second phase on corrosion performance and formation mechanism of PEO coating on AZ91 Mg alloy.JOURNAL OF ALLOYS AND COMPOUNDS,718,92-103.
MLA Chen, Yan,et al."Influence of second phase on corrosion performance and formation mechanism of PEO coating on AZ91 Mg alloy".JOURNAL OF ALLOYS AND COMPOUNDS 718(2017):92-103.
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