TITLE:
Characterisation and Corrosion-Erosion Behaviour of Carbide based Thermal Spray Coatings
AUTHORS:
Sukhpal Singh Chatha, Hazoor S. Sidhu, Buta S. Sidhu
KEYWORDS:
Thermal spray, Microstructure, Mechanical properties, Corrosion-erosion, Cr3C2-NiCr
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.11 No.6,
June
15,
2012
ABSTRACT: Thermal spraying has emerged as a suitable and effective surface engineering technology and is
widely used to apply wear, erosion and corrosion protective coatings for various kinds of
industrial applications. Cr3C2-based coatings have been applied to a wide range of industrial
components. Cr3C2-NiCr coatings offer greater corrosion and oxidation resistance, also having
a high melting point and maintaining high hardness, strength and wear resistance up to a
maximum operating temperature of 900 °C. The corrosion resistance is provided by NiCr matrix
while the wear resistance is mainly due to the carbide ceramic phase. This paper reviews the
performance, developments and applications of Cr3C2-NiCr thermal spray coatings for
corrosion/erosion-corrosion under different types of environments and outlines the
characterization of Cr3C2-NiCr coatings with respect to their microstructure and mechanical
properties, together with some brief characterisation work by the author for HVOF sprayed
75Cr3C2-25NiCr coating on T91 boiler steel.