Influence of KCl and HCl on high temperature corrosion of HVAF-sprayed NiCrAlY and NiCrMo coatings

Sadeghimeresht, Esmaeil and Reddy, Liam and Hussain, Tanvir and Huhtakangas, Matti and Markocsan, Nicolaie and Joshi, Shrikant (2018) Influence of KCl and HCl on high temperature corrosion of HVAF-sprayed NiCrAlY and NiCrMo coatings. Materials & Design, 148 . pp. 17-29. ISSN 0264-1275

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Abstract

The oxidation performance of NiCrAlY and NiCrMo coatings thermally sprayed by high velocity air-fuel (HVAF) technique has been investigated in a chloridizing-oxidizing environment, with and without a KCl deposit, at 600 °C for up to 168 h. Both coatings protected the substrate in the absence of KCl due to formation of a dense Cr-rich oxide scale. In the presence of KCl, Cl−/Cl2 diffused through a non-protective and porous NiCr2O4 scale formed on NiCrAlY, leading to formation of volatile CrCl3. On the other hand, Mo in NiCrMo stimulated the formation of a more protective Cr-rich oxide scale which increased the corrosion resistance by reducing Cl−/Cl2 diffusion.

Item Type: Article
Keywords: Thermal spray coating; NiCrAlYNiCrMo; High-velocity air fuel (HVAF); Biomass-/waste-fired boiler; Fireside corrosion
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: https://doi.org/10.1016/j.matdes.2018.03.048
Depositing User: Eprints, Support
Date Deposited: 09 Apr 2018 12:47
Last Modified: 02 Jul 2018 09:19
URI: http://eprints.nottingham.ac.uk/id/eprint/51038

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