Hot corrosion of CoCrAlTaY coating applied by HVOF in molten KCl-NaCl at 700 ºC

Rubén  Hurtado; Carlos Berlanga-Labari

doi:10.3989/revmetalm.e284.1725

Authors

Rubén Hurtado Institute for Advanced Materials and Mathematics (INAMAT), Department of Engineering, Public University of Navarre-UPNA https://orcid.org/0009-0000-9872-8187
Carlos Berlanga-Labari Institute for Advanced Materials and Mathematics (INAMAT), Department of Engineering, Public University of Navarre-UPNA https://orcid.org/0000-0003-3712-9433

DOI:

https://doi.org/10.3989/revmetalm.e284.1725

Keywords:

CoCrAlTaY, Hot corrosion, HVOF, Molten salts

Abstract

In the present study, the behavior of a CoCrAlTaY coating deposited by HVOF was investigated in molten chloride salts (KCl–NaCl) at 700 °C for 200 h. Although a significant thickness loss was not observed in the tested coating, substantial diffusion of chloride ions was detected, leading to chromium depletion and the formation of an extensive interdiffusion zone. Therefore, it can be concluded that the CoCrAlTaY coating does not provide adequate protection, highlighting the need to explore alternative coatings or multilayer strategies to improve corrosion resistance in molten chloride environments.

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