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

Sadeghimeresht, Esmaeil; Reddy, Liam; Hussain, Tanvir; Huhtakangas, Matti; Markocsan, Nicolaie; Joshi, Shrikant

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


Authors

Esmaeil Sadeghimeresht

Liam Reddy

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TANVIR HUSSAIN TANVIR.HUSSAIN@NOTTINGHAM.AC.UK
Professor of Coatings and Surface Engineering

Matti Huhtakangas

Nicolaie Markocsan

Shrikant Joshi



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.

Journal Article Type Article
Acceptance Date Mar 20, 2018
Online Publication Date Mar 22, 2018
Publication Date Jun 15, 2018
Deposit Date Apr 9, 2018
Publicly Available Date Mar 23, 2019
Journal Materials & Design
Print ISSN 0261-3069
Electronic ISSN 0264-1275
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 148
DOI https://doi.org/10.1016/j.matdes.2018.03.048
Keywords Thermal spray coating; NiCrAlYNiCrMo; High-velocity air fuel (HVAF); Biomass-/waste-fired boiler; Fireside corrosion
Public URL https://nottingham-repository.worktribe.com/output/938748
Publisher URL https://www.sciencedirect.com/science/article/pii/S0264127518302338

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