Hardness and electrochemical behavior of ceramic coatings on Inconel
Thin films of ceramic materials like alumina and silicon carbide are deposited on Inconel substrate by pulsed laser deposition technique using Q-switched Nd: YAG laser. Deposited films are characterized using UV-visible spectrophotometry and X-ray diffraction. Composite microhardness of ceramic coat...
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| Format: | Article |
| Language: | English |
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International Association of Physical Chemists (IAPC)
2012-03-01
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| Series: | Journal of Electrochemical Science and Engineering |
| Subjects: | |
| Online Access: | file:///D:/Dropbox/JESE/0_WEB/Articles/Vol_02/No_1/pdf/jESE_Vol2_No1_p19-31_2012.pdf |
| _version_ | 1818508502958604288 |
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| author | C. SUJAYA H. D. SHASHIKALA G. UMES A. C. HEGDE |
| author_facet | C. SUJAYA H. D. SHASHIKALA G. UMES A. C. HEGDE |
| author_sort | C. SUJAYA |
| collection | DOAJ |
| description | Thin films of ceramic materials like alumina and silicon carbide are deposited on Inconel substrate by pulsed laser deposition technique using Q-switched Nd: YAG laser. Deposited films are characterized using UV-visible spectrophotometry and X-ray diffraction. Composite microhardness of ceramic coated Inconel system is measured using Knoop indenter and its film hardness is separated using a mathematical model based on area-law of mixture. It is then compared with values obtained using nanoindentation method. Film hardness of the ceramic coating is found to be high compared to the substrates. Corrosion behavior of substrates after ceramic coating is studied in 3.5% NaCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The Nyquist and the Bode plots obtained from the EIS data are fitted by appropriate equivalent circuits. The pore resistance, the charge transfer resistance, the coating capacitance and the double layer capacitance of the coatings are obtained from the equivalent circuit. Experimental results show an increase in corrosion resistance of Inconel after ceramic coating. Alumina coated Inconel showed higher corrosion resistance than silicon carbide coated Inconel. After the corrosion testing, the surface topography of the uncoated and the coated systems are examined by scanning electron microscopy. |
| first_indexed | 2024-12-10T22:32:49Z |
| format | Article |
| id | doaj.art-ecc1f95dfdb041f7ac2eaaa4001583b9 |
| institution | Directory Open Access Journal |
| issn | 1847-9286 |
| language | English |
| last_indexed | 2024-12-10T22:32:49Z |
| publishDate | 2012-03-01 |
| publisher | International Association of Physical Chemists (IAPC) |
| record_format | Article |
| series | Journal of Electrochemical Science and Engineering |
| spelling | doaj.art-ecc1f95dfdb041f7ac2eaaa4001583b92022-12-22T01:31:01ZengInternational Association of Physical Chemists (IAPC)Journal of Electrochemical Science and Engineering1847-92862012-03-01211931Hardness and electrochemical behavior of ceramic coatings on InconelC. SUJAYAH. D. SHASHIKALAG. UMESA. C. HEGDEThin films of ceramic materials like alumina and silicon carbide are deposited on Inconel substrate by pulsed laser deposition technique using Q-switched Nd: YAG laser. Deposited films are characterized using UV-visible spectrophotometry and X-ray diffraction. Composite microhardness of ceramic coated Inconel system is measured using Knoop indenter and its film hardness is separated using a mathematical model based on area-law of mixture. It is then compared with values obtained using nanoindentation method. Film hardness of the ceramic coating is found to be high compared to the substrates. Corrosion behavior of substrates after ceramic coating is studied in 3.5% NaCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The Nyquist and the Bode plots obtained from the EIS data are fitted by appropriate equivalent circuits. The pore resistance, the charge transfer resistance, the coating capacitance and the double layer capacitance of the coatings are obtained from the equivalent circuit. Experimental results show an increase in corrosion resistance of Inconel after ceramic coating. Alumina coated Inconel showed higher corrosion resistance than silicon carbide coated Inconel. After the corrosion testing, the surface topography of the uncoated and the coated systems are examined by scanning electron microscopy.file:///D:/Dropbox/JESE/0_WEB/Articles/Vol_02/No_1/pdf/jESE_Vol2_No1_p19-31_2012.pdfMicrohardnessAluminaSilicon carbidePulsed laser depositionPotentiodynamic polarizationElectrochemical impedance spectroscopy |
| spellingShingle | C. SUJAYA H. D. SHASHIKALA G. UMES A. C. HEGDE Hardness and electrochemical behavior of ceramic coatings on Inconel Journal of Electrochemical Science and Engineering Microhardness Alumina Silicon carbide Pulsed laser deposition Potentiodynamic polarization Electrochemical impedance spectroscopy |
| title | Hardness and electrochemical behavior of ceramic coatings on Inconel |
| title_full | Hardness and electrochemical behavior of ceramic coatings on Inconel |
| title_fullStr | Hardness and electrochemical behavior of ceramic coatings on Inconel |
| title_full_unstemmed | Hardness and electrochemical behavior of ceramic coatings on Inconel |
| title_short | Hardness and electrochemical behavior of ceramic coatings on Inconel |
| title_sort | hardness and electrochemical behavior of ceramic coatings on inconel |
| topic | Microhardness Alumina Silicon carbide Pulsed laser deposition Potentiodynamic polarization Electrochemical impedance spectroscopy |
| url | file:///D:/Dropbox/JESE/0_WEB/Articles/Vol_02/No_1/pdf/jESE_Vol2_No1_p19-31_2012.pdf |
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