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Superalloys under the Effect of Hot Corrosion and Role of HVOF Coatings - A Review

Atul Agnihotri*, Sukhminderbir Singh Kalsi**

* Research Scholar, I.K. Gujral Punjab Technical University, Jalandhar, India.

** Assistant Professor, Department of Mechanical Engineering, I.K. Gujral Punjab Technical University, Jalandhar, India.

Periodicity:July - September'2016
DOI : https://doi.org/10.26634/jms.4.2.8128

Abstract

Superalloys are generally used for structural components at high temperatures above 540 °C in corrosive environments. The rising demand for more electricity, reduced plant emissions and higher efficient power plants had forced us to use better corrosion resistance materials. Only superalloys can meet these demands since they exhibit outstanding strength and surface stability at temperatures upto 85% of their melting points. At elevated temperatures and in oxidizing atmosphere, the metals and alloys start degrading due to the induction of fused salts deposits which is also known as the hot corrosion. Hot Corrosion has become a serious problem in boilers, gas turbines, IC engines and paper and pulp industries. No alloy is found to resist hot corrosion attack indefinitely. Though superalloys have been designed for elevated temperature applications, however protective coatings are applied to enhance their life for use in corrosive environments as they are not able to meet the requirement of high temperature strength and high temperature corrosion resistance simultaneously. The aim of the present study is to discuss the hot corrosion behaviours of the coatings at higher temperature under the light of available literature.

Keywords

Super Alloy, Hot Corrosion, Thermal Spray Coatings.

How to Cite this Article?

Agnihotri, A., and Kalsi, S. S. (2016). Superalloys under the Effect of Hot Corrosion and Role of HVOF Coatings - A Review. i-manager’s Journal on Material Science, 4(2), 30-36. https://doi.org/10.26634/jms.4.2.8128

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