Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 688, Issue -, Pages 841-857Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.07.081
Keywords
Ceramics; Composite materials; Sintering; Microstructure; X-ray diffraction
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Funding
- Universiti Teknologi Malaysia (UTM) UTM-Research University Grant (RUG) [Q.J130000.2524.04H78]
- Fundamental Research Grant Scheme (FRGS), Ministry of Education [R.J130000.7824.4F340]
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Titania nanoparticles were utilized as suspension in alkaline aluminate electrolyte to form nanocomposite coatings on magnesium alloy containing 1 wt% calcium by plasma electrolytic oxidation process. Microhardness, wettability, potentiodynamic polarization, wettability, electrochemical impedance spectroscopy (EIS), and immersion tests were performed in 3.5% NaCl solution to study corrosion behavior of the coated samples in reference to the uncoated Mg alloy. The coating with 4 g/L concentration of nanoparticles showed the highest microhardness, lowest hydrophilic properties and highest corrosion resistance. This coating substantially diminishes the Mg dissolution in the in 3.5% NaCl solution and increases the charge transfer resistance of the Mg alloy. Although higher concentrations of nanoparticles enhanced the defect density in the coating, they resulted in lower corrosion resistance. (C) 2016 Elsevier B.V. All rights reserved.
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