Influence of KCl and HCl on a Laser Clad FeCrAl Alloy: In-Situ SEM and Controlled Environment High Temperature Corrosion

Reddy, L.; Sattari, M.; Davis, C.J.; Shipway, P.H.; Halvarsson, M.; Hussain, T.

Abstract

This study investigated the effects of HCl and KCl on a laser-clad FeCrAl coating at 450 °C in an in-situ ESEM followed by a furnace exposure. In all in-situ TEM cross-sections, three major phases were identified: an iron rich oxide, an iron-chromium mixed oxide and an aluminium enriched layer. HCl allowed chlorine based corrosion to occur which suggests interaction from its gas phase. EDX of the regions around KCl crystals showed a decrease in chromium which is an indication of chlorine selectively removing chromium. Moreover, the mass gain in HCl with KCl was significantly lower than that observed in air with KCl.

Citation

Reddy, L., Sattari, M., Davis, C., Shipway, P., Halvarsson, M., & Hussain, T. (2019). Influence of KCl and HCl on a Laser Clad FeCrAl Alloy: In-Situ SEM and Controlled Environment High Temperature Corrosion. Corrosion Science, 158, 1-10. https://doi.org/10.1016/j.corsci.2019.07.003

• Journal Article Type: Article
• Acceptance Date: Jul 5, 2019
• Online Publication Date: Jul 9, 2019
• Publication Date: Sep 1, 2019
• Deposit Date: Jul 17, 2019
• Publicly Available Date: Jul 17, 2019
• Journal: Corrosion Science
• Print ISSN: 0010-938X
• Electronic ISSN: 1879-0496
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 158
• Article Number: 108076
• Pages: 1-10
• DOI: https://doi.org/10.1016/j.corsci.2019.07.003
• Keywords: In-situ SEM; Aluminium; High Temperature Corrosion; Molten Salts (A)
• Public URL: https://nottingham-repository.worktribe.com/output/2314826
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0010938X18320079