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EFFECTS OF SECOND PHASES ON MICROARC OXIDATION PROCESS OF MAGNESIUM BASE MATERIALS
Wang Yanqiu1; Wu Kun2; Wang Fuhui1,3
Corresponding AuthorWang Yanqiu(qiuorwang@hrbeu.edu.cn)
2016-06-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:6Pages:689-697
AbstractThe effects of second phases on microarc oxidation (MAO, also named plasma electrolytic oxidation-PEO) behavior of Mg base materials were investigated and the related mechanism was discussed. The formation of barrier layer and its influence on sparking discharge behavior were characterized and analyzed on the base of systematic selecting and designing substrate materials. The variation of second phases at the early MAO stage was observed and analyzed by SEM and EDS, and then the effect mechanism of second phases on MAO behaviors was revealed. Voltage evolution trend during MAO were recorded to study the formation state of the barrier layer on the different Mg base materials. According to the growth mechanism of MAO film, the film growth process can be simplistically considered as a repeated breakdown and reconstruction process of a capacitor. Accordingly, the growth process of MAO film on multiphase metal materials and the effects of second phases were discussed. The results show that different second phases in substrate materials have different effects on formation process of MAO films, depending on their own characteristics. For the second phases which have the characteristics of valve metals, although selective sparking discharge occurs at the early stage of MAO, the second phases will not hinder the growth of MAO film since barrier layer can form on the second phases, and they will not induce structural defects into the film-substrate interface. If the second phases have not the characteristics of valve metals, their conductivity property, will be an important influencing factor to affect the MAO behaviors. For the elecinsulating second phases which have not the characteristics of valve metals, sparking discharge just occurs on Mg matrix in the substrate, while doesn't occur on the second phases; the second phases exist in the MAO film as heterogeneous phases, do not react in MAO process, and will not hinder the growth of MAO film. For the semi-conductive second phases which have not the characteristics of valve metals, they delay the growth of MAO film because they destroy the integrity of barrier layer. For the electroconductive second phases which have not the characteristics of valve metals, they seriously hinder the growth of MAO film.
Keywordmagnesium alloy metal matrix composite second phase microarc oxidation barrier layer
Funding OrganizationNational Natural Science Foundation of China ; International S&T Cooperation Program of China
DOI10.11900/0412.1961.2015.00500
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51001036] ; International S&T Cooperation Program of China[2014DFR50560]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000377642600006
PublisherSCIENCE PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/122358
Collection中国科学院金属研究所
Corresponding AuthorWang Yanqiu
Affiliation1.Harbin Engn Univ, Key Lab Superlight Mat & Surface Technol, Educ Minist, Harbin 150001, Peoples R China
2.Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Wang Yanqiu,Wu Kun,Wang Fuhui. EFFECTS OF SECOND PHASES ON MICROARC OXIDATION PROCESS OF MAGNESIUM BASE MATERIALS[J]. ACTA METALLURGICA SINICA,2016,52(6):689-697.
APA Wang Yanqiu,Wu Kun,&Wang Fuhui.(2016).EFFECTS OF SECOND PHASES ON MICROARC OXIDATION PROCESS OF MAGNESIUM BASE MATERIALS.ACTA METALLURGICA SINICA,52(6),689-697.
MLA Wang Yanqiu,et al."EFFECTS OF SECOND PHASES ON MICROARC OXIDATION PROCESS OF MAGNESIUM BASE MATERIALS".ACTA METALLURGICA SINICA 52.6(2016):689-697.
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