Effect of SiO2 dispersion on chlorine-induced high temperature corrosion of HVAF-sprayed NiCrMo coating

Sadeghimeresht, Esmaeil and Markocsan, Nicolaie and Hussain, Tanvir and Huhtakangas, Matti and Joshi, Shrikant (2018) Effect of SiO2 dispersion on chlorine-induced high temperature corrosion of HVAF-sprayed NiCrMo coating. Corrosion . ISSN 0010-9312

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (528kB) | Preview
[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (2MB) | Preview

Abstract

NiCrMo coatings with and without dispersed SiO2 were deposited using high velocity air-fuel (HVAF) technique. Thermogravimetric experiments were conducted in 5% O2+500 vppm HCl+N2 with and without a KCl deposit at 600 °C for up to 168 h. The SiO2-containing coating showed lower weight change due to formation of a protective and adherent Cr-rich oxide scale. SiO2 decelerated short-circuit diffusion of Cr3+ through scale’s defects, e.g., vacancies, and promoted the selective oxidation of Cr to form the protective Cr-rich oxide scale. Furthermore, the presence of SiO2 led to less subsurface depletion of Cr in the coating, and accordingly less corrosion of the substrate. The formed corrosion product on the SiO2-free coating was highly porous, non-adherent, and thick.

Item Type: Article
Keywords: Thermal Spray Coating; Chlorine-Induced High Temperature Corrosion; NiCrMo; SiO2 Dispersion; High Velocity Air-Fuel (HVAF); Biomass-/Waste-Fired Boiler
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: https://doi.org/10.5006/2802
Depositing User: Eprints, Support
Date Deposited: 09 May 2018 14:54
Last Modified: 27 Jul 2018 09:15
URI: http://eprints.nottingham.ac.uk/id/eprint/51668

Actions (Archive Staff Only)

Edit View Edit View