Title: High temperature corrosion behaviour of HVOF-sprayed Ni-20Cr coating on boiler steel in molten salt environment at 900°C

Authors: G. Kaushal; H. Singh; S. Prakash

Addresses: Department of Mechanical Engineering, RIMT – Institute of Engineering and Technology, Mandi Gobindgarh – 147301, Punjab, India. ' School of Mechanical, Materials and Energy Engineering, Indian Institute of Technology Ropar, Rupnagar – 140001, India. ' Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee – 247667, India

Abstract: Ni-20Cr coating was deposited on a commonly used boiler steel ASTM A213 347H by high-velocity oxy-fuel (HVOF) thermal spray process to enhance its high-temperature corrosion resistance. High temperature corrosion behaviour was investigated for the uncoated and HVOF sprayed Ni-20Cr coated boiler steel in a simulated boiler environment (Na2SO4-60%V2O5) at 900°C for 50 cycles.

Keywords: high temperature corrosion; boiler steel; protective coating; oxide scales; Ni-20Cr; high velocity oxyfuel; HVOF thermal spray; corrosion resistance; simulation; corrosion kinetics; steel coatings.

DOI: 10.1504/IJSURFSE.2011.044388

International Journal of Surface Science and Engineering, 2011 Vol.5 No.5/6, pp.415 - 433

Received: 18 Oct 2010
Accepted: 11 May 2011

Published online: 24 Dec 2011 *

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