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Corrosion resistance of cerium-doped zinc calcium phosphate chemical conversion coatings on AZ31 magnesium alloy
Zeng, Rong-chang; Hu, Yan; Zhang, Fen; Huang, Yuan-ding; Wang, Zhen-lin; Li, Shuo-qi; Han, En-hou; rczeng@foxmail.com
2016
Source PublicationTRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
ISSN1003-6326
Volume26Issue:2Pages:472-483
AbstractZinc calcium phosphate (Zn-Ca-P) coating and cerium-doped zinc calcium phosphate (Zn-Ca-Ce-P) coating were prepared on AZ31 magnesium alloy. The chemical compositions, morphologies and corrosion resistance of coatings were investigated through energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), electron probe micro-analysis (EPMA) and scanning electron microscopy (SEM) together with hydrogen volumetric and electrochemical tests. The results indicate that both coatings predominately contain crystalline hopeite (Zn-3(PO4)(2)center dot 4H(2)O), Mg-3(PO4)(2) and Ca-3(PO4)(2), and traces of non-crystalline MgF2 and CaF2. The Zn-Ca-Ce-P coating is more compact than the Zn-Ca-P coating due to the formation of CePO4, and displays better corrosion resistance than the Zn-Ca-P coating. Both coatings protect the AZ31 Mg substrate only during an initial immersion period. The micro-galvanic corrosion between the coatings and their substrates leads to an increase of hydrogen evolution rate (HER) with extending the immersion time. The addition of Ce promotes the homogenous distribution of Ca and formation of hopeite. The Zn-Ca-Ce-P coating has the potential for the primer coating on magnesium alloys.
description.department[zeng, rong-chang ; hu, yan ; zhang, fen ; li, shuo-qi] shandong univ sci & technol, coll mat sci & engn, qingdao 266590, peoples r china ; [zeng, rong-chang ; hu, yan ; zhang, fen ; li, shuo-qi] shandong univ sci & technol, state key lab min disaster prevent & control cofo, qingdao 266590, peoples r china ; [zeng, rong-chang ; hu, yan ; zhang, fen ; li, shuo-qi] shandong univ sci & technol, minist sci & technol, qingdao 266590, peoples r china ; [wang, zhen-lin] chongqing univ technol, sch mat sci & engn, chongqing 400054, peoples r china ; [huang, yuan-ding] zentrum mat & kustenforsch gmbh, magic magnesium innovat ctr, helmholtz zentrum geesthacht, d-21502 geesthacht, germany ; [han, en-hou] chinese acad sci, natl engn ctr corros control, inst met res, shenyang 110016, peoples r china
KeywordAz31 Magnesium Alloy Cerium Zinc Calcium Phosphate Chemical Conversion Coating Corrosion Resistance
Funding OrganizationNational Natural Science Foundation of China [51571134]; SDUST Research Fund [2014TDJH104]; Joint Innovative Centre for Safe and Effective Mining Technology and Equipment of Coal Resources, Shandong Province, China; Natural Science Foundation of Chongqing, China [cstc2012jjA50034]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74694
Collection中国科学院金属研究所
Corresponding Authorrczeng@foxmail.com
Recommended Citation
GB/T 7714
Zeng, Rong-chang,Hu, Yan,Zhang, Fen,et al. Corrosion resistance of cerium-doped zinc calcium phosphate chemical conversion coatings on AZ31 magnesium alloy[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2016,26(2):472-483.
APA Zeng, Rong-chang.,Hu, Yan.,Zhang, Fen.,Huang, Yuan-ding.,Wang, Zhen-lin.,...&rczeng@foxmail.com.(2016).Corrosion resistance of cerium-doped zinc calcium phosphate chemical conversion coatings on AZ31 magnesium alloy.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,26(2),472-483.
MLA Zeng, Rong-chang,et al."Corrosion resistance of cerium-doped zinc calcium phosphate chemical conversion coatings on AZ31 magnesium alloy".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 26.2(2016):472-483.
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