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Microstructure and Corrosion Resistance Studies of PEO Coated Mg Alloys with a HF and US Pretreatment
Wei, Fangfang; Zhang, Wei; Zhang, Tao; Wang, Fuhui; Zhang, W; Zhang, T (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, 62 Wencui Rd, Shenyang 110016, Peoples R China.
2017
Source PublicationINTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
ISSN1452-3981
Volume12Issue:1Pages:155-165
AbstractThe effect of hydrofluoric acid (HF) pretreatment on the microstructure and corrosion resistance of PEO coatings on AZ91 Mg alloys was investigated. The results showed that thin fluoride film was formed on AZ91 Mg alloy after pretreatment. The application of ultrasound (US) in the pretreatment made the film more compact and increased its F content. PEO coatings deposited on the pretreated AZ91 become denser with decreased porosity level and have no structural defects. The inner layer (IL) of PEO coating of HF-treated AZ91 with US is more intact and contains more F than those obtained without US. The better quality of IL could facilitate the stable discharge and form compact PEO coating. Therefore, PEO coating deposited on AZ91 pretreated with (HF+US) offered a better corrosion resistance, which is in good agreement with the results of electrochemical measurements.; The effect of hydrofluoric acid (HF) pretreatment on the microstructure and corrosion resistance of PEO coatings on AZ91 Mg alloys was investigated. The results showed that thin fluoride film was formed on AZ91 Mg alloy after pretreatment. The application of ultrasound (US) in the pretreatment made the film more compact and increased its F content. PEO coatings deposited on the pretreated AZ91 become denser with decreased porosity level and have no structural defects. The inner layer (IL) of PEO coating of HF-treated AZ91 with US is more intact and contains more F than those obtained without US. The better quality of IL could facilitate the stable discharge and form compact PEO coating. Therefore, PEO coating deposited on AZ91 pretreated with (HF+US) offered a better corrosion resistance, which is in good agreement with the results of electrochemical measurements.
description.department[wei, fangfang] univ sci & technol china, sch mat sci & engn, hefei 230026, peoples r china ; [wei, fangfang ; zhang, wei ; zhang, tao ; wang, fuhui] chinese acad sci, inst met res, lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china
KeywordMg Alloys Plasma Electrolytic Oxidation Oxide Coatings Pretreatment Corrosion
Subject AreaElectrochemistry
Funding OrganizationKey Project of Natural Science Foundation of China [51531007]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78361
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, 62 Wencui Rd, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Wei, Fangfang,Zhang, Wei,Zhang, Tao,et al. Microstructure and Corrosion Resistance Studies of PEO Coated Mg Alloys with a HF and US Pretreatment[J]. INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,2017,12(1):155-165.
APA Wei, Fangfang,Zhang, Wei,Zhang, Tao,Wang, Fuhui,Zhang, W,&Zhang, T .(2017).Microstructure and Corrosion Resistance Studies of PEO Coated Mg Alloys with a HF and US Pretreatment.INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,12(1),155-165.
MLA Wei, Fangfang,et al."Microstructure and Corrosion Resistance Studies of PEO Coated Mg Alloys with a HF and US Pretreatment".INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE 12.1(2017):155-165.
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