Antibacterial activities and corrosion behavior of novel PEO/nanostructured ZrO2 coating on Mg alloy

被引：69
作者：
Daroonparvar, Mohammadreza [1 ,2 ]
Mat Yajid, Muhamad Azizi [1 ]
Kumar Gupta, Rajeev [2 ]
Mohd Yusof, Noordin [1 ]
Bakhsheshi-Rad, Hamid Reza [1 ,3 ]
Ghandvar, Hamidreza [1 ]
Ghasemi, Ehsan [4 ]
机构：
[1] Univ Teknol Malaysia, Fac Mech Engn, Dept Mat Mfg & Ind Engn, Johor Baharu 81310, Johor, Malaysia
[2] Univ Akron, Dept Chem & Biomilecular Engn, Corros Engn Program, Akron, OH 44325 USA
[3] Islamic Azad Univ, Adv Mat Res Ctr, Dept Mat Engn, Najafabad Branch, Najafabad, Iran
[4] Univ Tehran, Fac Vet Med, Dept Clin Sci, Tehran, Iran
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2018年 / 28卷 / 08期
关键词：
Mg alloy; ceramics; coating materials; microstructure; scanning electron microscopy (SEM); PLASMA ELECTROLYTIC OXIDATION; AZ31 MAGNESIUM ALLOY; MICRO-ARC OXIDATION; THERMAL BARRIER COATINGS; GROWN OXIDE LAYER; COMPOSITE COATINGS; CERAMIC COATINGS; BOND COAT; RESISTANCE; FABRICATION;
D O I：
10.1016/S1003-6326(18)64799-5
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Plasma electrolytic oxidation (PEO) was developed as a bond coat for air plasma sprayed (APS) nanostructure ZrO2 as top coat to enhance the corrosion resistance and antibacterial activity of Mg alloy. Corrosion behavior and antibacterial activities of coated and uncoated samples were assessed by electrochemical tests and agar diffusion method toward Escherichia coli (E. coli) bacterial pathogens, respectively. The lowest corrosion current density and the highest charge transfer resistance, phase angle and impedance modulus were observed for PEO/nano-ZrO2 coated sample compared with those of PEO coated and bare Mg alloys. Nano-ZrO2 top coat which has completely sealed PEO bond coat is able to considerably delay aggressive ions transportation towards Mg alloy surface and significantly enhances corrosion resistance of Mg alloy in simulated body fluid (SBF) solution. Moreover, higher antibacterial activity was also observed in PEO/nano-ZrO2 coating against bacterial strains than that of the PEO coated and bare Mg alloys. This observation was attributed to the presence of ZrO2 nanoparticles which decelerate E. coli growth as a result of E. coli membranes.
引用
收藏
页码：1571 / 1581
页数：11
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