[2017-Vol.14-Issue 3]The Effects of Aging Time on the Structural and Electrochemical Properties of Composite Coatings on CP-Ti Substrate
Time: 2017-09-12 15:47  Click:171

Journal of Bionic Engineering

Volume 14, Issue 3, July 2017, Pages 532-539
Onur Çomakli1 , Mustafa Yazici2 , Tuba Yetim3 , Ali Fatih Yetim4 , Ayhan Çelik1
1. Department of Mechanical Engineering, Faculty of Engineering, Ataturk University, 25240 Erzurum, Turkey
2. High Technology Research Centre, Erzurum Technical University, 25070 Erzurum, Turkey
3. Faculty of Engineering and Architecture, Department of Chemical Engineering, Erzurum Technical University, 25070 Erzurum, Turkey
4. Faculty of Engineering and Architecture, Department of Mechanical Engineering, Erzurum Technical University, 25070 Erzurum, Turkey
 

Abstract

TiO2–SiO2 composite films were produced on commercially pure titanium (CP-Ti) substrate by a sol–gel method to investigate the behavior of sol aging time and its potential effects on the structural and electrochemical properties of composite coatings. Anatase-TiO2 and quartz-SiO2 peaks were observed on all composite coated samples according to XRD results. It was observed that the average grain size increased with sol aging time. Also, the average smallest grain size was seen at composite coatings prepared from unaged sol according to the width of the peaks. Electrochemical behavior of coated samples was mainly investigated by potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) in Simulated Body Fluid (SBF) solution. In corrosion tests, the composite coatings showed better anti-corrosion behavior than that of uncoated samples. In addition, the corrosion properties of the composite films were considerably affected by sol aging time. Corrosion resistance of coatings decreased with increasing aging time and the best result was obtained from composite coatings prepared from unaged sol.

Keywords

bioinspired TiO2–SiO2 coatings;
CP-Ti substrate;
electrochemical properties;
 
sol–gel
 
 


Full text is available at
 
http://www.sciencedirect.com/science/article/pii/S1672652916604195

 

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