Degradation of Cr3C2-NiCr coating prepared by the HVOF technique

J. Rapouch

doi:10.2478/kom-2013-0009

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Degradation of Cr3C2-NiCr coating prepared by the HVOF technique

Koroze a ochrana materiálu

Volume 57 (2013): Issue 3 (September 2013)

By: J. Rapouch

Open Access

|Sep 2013

Abstract

After a few hours of operation, a Cr₃C₂-NiCr-based HVOF coating on a spindle made of high-chromium steel X22Cr-MoV12-1 degraded when exposed to overheated steam. The study evaluates the level of coating damage by analysing chemical and phase composition on the surface and on the cross-section of the layer. Ni-Cr, Cr₃C₂ and Cr₂O₃ phases were detected in both degraded and non-degraded layers. During the exposure, the layer thickness thinned by an order of magnitude. The layer degradation was probably induced by oxidation in a steam environment; voluminous particles on the steel/coating interface might have played a negative role.

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