Hot Corrosion Studies on HVOF Coated Alloy A-286 in Molten Salt Environment

Authors

  • Ananthi A.
  • M. Arivarasu Vellore Institute of Technology, Centre for Innovative Manufacturing Research, Vellore-632 014, India
  • K. Jithesh Adi Shankara Institute of Engineering and Technology Kalady, Department of Mechanical Engineering, India
  • M. Vignesh Vellore Institute of Technology, School of Mechanical Engineering, Vellore-632014, India
  • V. Dhinakaran Chennai Institute of Technology, Centre for Additive Manufacturing, Chennai-600 069, India
  • P. Suresh Kumar Ramco Institute of Technology, Department of Mechanical Engineering, Rajapalayam, India

DOI:

https://doi.org/10.24425/amm.2024.149790

Abstract

The corrosion resistance Cr3C2-25%NiCr and Ni-20%Cr coatings were deposited on the alloy A-286 by high-velocity oxy-fuel (HVOF) coating, and the high-temperature corrosion features were evaluated at 700 and 850°C in Na2SO4-5%NaCl-7.5%NaVO3 atmosphere. Deposited coatings are dense and well-adherent to the substrate. A scanning electron microscope (SEM) is used to analyze the structure of the corroded samples. Results showed that Cr3C2 -25%NiCr coating provides better resistance to corrosion at 700°C, which is attributed to the protective Cr2O3 development. The coated metal was exposed at 850°C, and a higher corrosion rate was observed compared to 700°C, indicating that the temperature influenced the oxidation rate. The coating failure (crack) was noticed on the Cr3C2-25%NiCr coated surface when exposed at 850°C, and no damages are in the Ni-20%Cr coating.

Published

2024-06-21

How to Cite

A., Ananthi, et al. “Hot Corrosion Studies on HVOF Coated Alloy A-286 in Molten Salt Environment”. Archives of Metallurgy and Materials, vol. 69, no. 2, June 2024, doi:10.24425/amm.2024.149790.

Issue

Vol. 69 No. 2 (2024)

Section

Articles