Influence of high velocity oxy-fuel parameters on the corrosion resistance of NiCr coatings
| Autor: | Peyman Farahpour, Mohammad Mahdi Kheirikhah, AH Mirrahimi, H Edris |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications. 227:318-335 |
| ISSN: | 2041-3076 1464-4207 |
| DOI: | 10.1177/1464420712459993 |
| Popis: | In the present study, the corrosion behavior of Nickel-base coatings on carbon steel as a substrate was analyzed. The samples were coated using a high velocity oxy-fuel thermal spray technique. In order to investigate the effects of spray variables on coating quality as compared with corrosion behavior of NiCr alloy in NaCl 3.5% solution, six design experiments were considered. The NiCr powder alloy contained 20% Cr. The sprays variables were fuel: oxygen, 1.07 and 1.25 both in reduction condition and also the powder feed rate 18, 27 and 36 g/min were selected. The high velocity oxy-fuel coated samples were corrosion tested using the potentiostatic polarization tester. Analyzing the polarization graph allowed the selection of the optimum operating conditions to achieve the desired specifications of the high velocity oxy-fuel coatings for their best corrosion resistance in the chosen environment. The samples structures were characterized by a scanning electron microscopy, energy-dispersive X-ray spectroscopy analysis and X-ray diffraction. The analysis of the results indicated that the fuel/oxygen and the powder feed rate have a significant effect on the porosity and corrosion resistance of these coatings. Corrosion behavior of the sample coated by fuel: oxygen 1.25 and powder feed rate 18 g/min was the best. |
| Databáze: | OpenAIRE |
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