Chromium diffusion kinetics in nano-ceria and doped ceria coatings: An UCF-PNNL collaboration
EMSL Project ID
18790
Abstract
Steels are used as a staple alloy (worldwide consumption over 20 million tons annually) in applications such as household appliances, cutlery, oil and gas pipelines, and the like. However, select steels are not as corrosion and failure resistant in the high temperature regime, due to scale spallation. Addition of rare earths such as Ce, La, Nd in the steel can increase the oxidation resistance resulting high production cost. It has been showed that oxide scale growth mechanism is by inward oxygen migration rather than chromium outward diffusion. However, the application of superficial nano-rare earth oxide coatings might provide a particular solution to the problem.In this research, methods of measurement and application certification herein are successful; a completely detailed analysis of the oxide scale growth mechanism would be documented in presence of these novel nano-coatings. The rate effects that cerium oxide has on the growth properties of the protective oxide scale would also be revealed as a function of dopant and valence states. A novel approach to nano - rare earth particle synthesis will be further derived, its application to the stainless steel will be studied, and characterized to develop cost effective high performance coatings.
This proposal is collaboration between University of Central Florida, and PNNL under a joint agreement between the Pacific Northwest National Laboratory and the National Science Foundation. The proposed tasks in the proposal will enable UCF students and faculty to have access to the Environmental Molecular Sciences Laboratory at PNNL.
The primary objectives are:
? Prepare and study the effect of doped nano-ceria as a function of oxygen vacancy concentration on the formation of protective chromia layer (UCF-PNNL)
? Vary the dopant concentration to change the oxygen vacancy concentration in nanoceria (UCF)
? Comparative study on the oxide layer formed through different characterization techniques (grain size and oxygen vacancies) (PNNL)
Through this supplemental program, we intend to address the fundamental research on the chemistry and physics of complex nano-coatings thus, providing molecular information about processes occurring at the surface and interfaces of the coatings and the substrate when used in elevated temperatures.
Project Details
Project type
Large-Scale EMSL Research
Start Date
2006-07-28
End Date
2008-10-27
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members