High-Temperature Corrosion of HVAF-Sprayed Ni-Based Coatings for Boiler Applications
| العنوان: | High-Temperature Corrosion of HVAF-Sprayed Ni-Based Coatings for Boiler Applications |
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| المؤلفون: | Eklund, Johan, Phother, J., Sadeghi, Esmaeil, 1985, Joshi, Shrikant V., 1960, Liske, Jesper |
| المصدر: | Oxidation of Metals. 91(5-6):729-747 |
| مصطلحات موضوعية: | Aluminum alloys, Aluminum corrosion, Binary alloys, Biomass, Boiler corrosion, Boilers, Chlorine compounds, Chromium alloys, Corrosion resistance, Corrosion resistant coatings, Corrosive effects, Diffusion coatings, High temperature applications, High temperature corrosion, Sprayed coatings, Wastes, Corrosion behaviour, Corrosive environment, HVAF, Long term exposure, Ni-based coatings, NiCrAlY coating, Protective oxides, Waste-fired boilers, Potassium compounds, Manufacturing and materials engineering, Produktions- och materialteknik |
| الوصف: | The present study investigates the initial corrosion behaviour of HVAF-sprayed NiCr, NiAl and NiCrAlY coatings in two different environments, O 2 + H 2 O and O 2 + H 2 O + KCl at 600 °C for up to 168 h in order to evaluate the possibility of utilizing such coatings in biomass- and waste-fired boilers. SEM/EDX analysis showed that all coatings displayed a protective behaviour in O 2 + H 2 O. Upon addition of KCl (O 2 + H 2 O + KCl), the corrosion behaviour of the NiCr coating drastically changed as it formed a thick oxide layer and displayed major chlorine diffusion down to the substrate. The NiCrAlY coating displayed a significantly better corrosion resistance with only minor oxide formation. The NiAl coating exhibited a protective behaviour similar to when exposed in the absence of KCl indicating that a thin protective oxide has formed on the coating surface. The performance of the NiAl and NiCrAlY coatings is promising for future studies with long-term exposures in more corrosive environments such as in a biomass- and waste-fired boiler. © 2019, The Author(s). |
| وصف الملف: | electronic |
| URL الوصول: | https://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-13758 https://doi.org/10.1007/s11085-019-09906-0 https://hv.diva-portal.org/smash/get/diva2:1316391/FULLTEXT01.pdf |
| قاعدة البيانات: | SwePub |
| DOI: | 10.1007/s11085-019-09906-0 |
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