Characterisation and Corrosion-Erosion Behaviour of Carbide based Thermal Spray Coatings

Sukhpal Singh Chatha, Hazoor S. Sidhu, Buta S. Sidhu

Punjab Technical University, Jalandhar, Punjab-144601, India.
Yadavindra College of Engineering, Punjabi University Guru Kashi Campus, Talwandi Sabo,Bathinda, Punjab-151302, India.

DOI: 10.4236/jmmce.2012.116041                

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.

Keywords

Thermal spray, Microstructure, Mechanical properties, Corrosion-erosion, Cr₃C₂-NiCr

Conflicts of Interest

The authors declare no conflicts of interest.

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