Volume 33, Issue 2 (Journal of Advanced Materials-fall 2015)
2015, 33(2): 17-30 |
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Z. Ansari, M. Alizadeh, A. Sadeghzadeh Attar. Synthesis and Evaluation of Corrosion Behavior of Al2O3/MgO/TiO2 Mixed-Metal Oxides Coating by Sol-Gel Method on Al Substrate. Journal of Advanced Materials in Engineering (Esteghlal) 2015; 33 (2) :17-30
URL: http://jame.iut.ac.ir/article-1-576-en.html
URL: http://jame.iut.ac.ir/article-1-576-en.html
, z.ansari64@gmail.com
Abstract: (9986 Views)
In this study, mixed metal oxides Al2O3/MgO/TiO2 coatings with Al/Mg/Ti ratios of 5:1:3 and 2.5:3:4 were coated on AA1100 aluminum by sol-gel method. The surface morphology, phase analysis and the corrosion behavior of the Al2O3/MgO/TiO2 coatings were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and electrochemical impedance spectroscopy measurements (EIS) in 3.5 wt.% NaCl solution. The thermal behaviors, the bonds configuration, and functional groups of the coated samples were studied by thermo-gravimetric and differential thermal analysis (TG-DTA) and Fourier transform infrared spectroscopy (FTIR), respectively. The results demonstrated that heat treatment at
450 °C caused an increase in porosity and coating cracking, finally leading to the decrease of corrosion resistance. The best corrosion resistance was achieved for the sample with Al/Mg/Ti molar ratio of 5:1:3 without any heat treatment. The structure of this sample was amorphous, and heat treatment resulted in crystallization and decrease of the corrosion resistance.
Type of Study: Research |
Subject:
General
Received: 2015/02/25 | Accepted: 2015/02/25 | Published: 2015/02/25
Received: 2015/02/25 | Accepted: 2015/02/25 | Published: 2015/02/25
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