Coating of MgO Thin Film on Porous NiTi Supper Elastic Alloy by MAO

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Falaki, Sajjad | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45338 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Sadrnezhad, Khatiboleslam
Abstract:
The novel Micro Arc Oxidation technique (MAO) is gaining increased attention for depositing thick, dense, corrosion resistant and hard ceramic coating on metals. In this research, the effects of parameters including electrolyte composition and coating time on properties of MAO coatings formed on NiTi were investigated. The surface morphology, thickness and phase composition of coatings were investigated using scanning electron microscope and X-ray diffraction. Corrosion behavior of the coatings was examined by potentiodynamic polarization. Also wear resistance was examined by pin on disk test. It was found that MAO coatings improve corrosion resistance of NiTi. All of these applied parameters, affected the surface morphology (pore size) and thickness of coatings but just some of them changed phase composition of coatings. Also Results showed that nano MgO particles with high hardness had a significant role in improving the wear properties of the coating and also by filling the porosities of discharge channels, can increase the corrosion resistance of the coating
Keywords:
Titanium ; Alumina-Silicate Composite Coating ; Corrosion Resistance ; Wear Resistance ; Micro Arc Oxidation (MAO)

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