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- Type of Document: M.Sc. Thesis
- Language: English
- Document No: 41733 (57)
- University: Sharif University of Technology, International Campus, Kish Island
- Department: Science and Engineering
- Advisor(s): Dolati, Abolghasem
- Abstract:
- This research focuses on finding an appropriate method for increasing wear and corrosion resistance of hard coating TiN PVD and chromium. The substrate was made up of 42CrMo4 (DIN) steel (used for marine industries) and coated by TiN Arc PVD process and hard chromium electro-deposition. The results of these two coatings are compared and the better coating which is TiN Arc PVD is suggested. To find the best method for coating, several test studies are organized such as: the mechanical and tribological properties of TiN PVD and hard chromium coatings for wear and corrosion resistance applications are organized. The potentiodynamic polarization technique was used to measure the corrosion rate and the resistance of the coatings. SEM microscopy was used to investigate surface morphology. Hardness was measured by nanoindentation and the coefficient of friction coatings during scratch was determined. From quantity point of view, the results showed that the TiN PVD coating had the best corrosion resistance in 3.5 % NaCl solution. Both coatings also had high wear resistant and low friction coefficient which was about 0.3. The hardness of the TiN-coated material showed a two and three time increase in hardness compared to the hard Cr coating. In a word, TiN Arc PVD coating properties are similar to or even better than the hard chromium coating which has a toxic process
- Keywords:
- Coverage ; Corrosion ; Hardness ; Wear Resistance ; Surface Roughness ; Wear Test ; Hard Chromium Coating ; Physical Vapor Deposition ; Ceramic Coating
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