Speaker and Affliation:
Prof. V.A. Ravi
Professor, Department of Chemical and Materials Engineering,
California State Polytechnic University, Pomona (Cal Poly Pomona)
Dr. Vilupanur A. Ravi is a Professor in the Department of Chemical and Materials Engineering at the California State Polytechnic University, Pomona (Cal Poly Pomona), USA. He is currently the K. P. Abraham Visiting Chair Professor in the Department of Materials Engineering at the Indian Institute of Science. He is an alumnus of the Institute, having obtained his B.E. in Metallurgy with distinction, followed by MS and PhD degrees from the Ohio State University. His research interests are in the areas of corrosion, high temperature materials/coatings and materials processing. His work has been recognized through several awards and honors including the NACE Technical Achievement Award, and Fellowships in several organizations including the National Academy of Inventors, ASM International, and NACE International. He is a registered Professional Engineer (PE) in California, a Chartered Engineer (CEng) in the UK and a European Engineer (Eur Ing).
20th May, 2022 (Friday), 03:00 PM (India Standard Time)
Department of Materials Engineering, KPA auditorium
Halide activated pack cementation is a versatile and economical process of surface modification applicable to a broad range of metallic substrates, with nickel and iron-based alloys being the most common. The alloy surfaces can be engineered for resistance to corrosion, wear, erosion, etc., for service in demanding environments, e.g., those involving high temperature oxidation, accelerated corrosion under fused salt films, etc. If the fundamentals are well understood, the coating process can be controlled to obtain the desired final composition and microstructure. The in -situ generation of halide vapor species inside the pack with subsequent transport, surface reactions and solid-state diffusion are all important phenomena that need attention to achieve optimal coating conditions. In this talk, I will review the halide-activated pack cementation process; discuss relevant thermodynamics and kinetics, and present examples from our work.