Fluidized bed combustion systems are attractive for energy production since they can burn different types of fuels. This report details work in identifying suitable materials for heat exchanger applications. Also, a first general corrosion model for deposit-enhanced pressurized fluidized bed combustion (PFBC) corrosion is described. A summary of the work performed in the program is as follows: (1) modified existing corrosion reactor to simulate deposit-enhanced PFBC corrosion environment; (2) completed test 1, a 500 h experiment to examine sample reproducibility; (3) completed test 2, a 1000 h experiment to examine the effect of deposit type and thickness; (4) completed test 3, a 4000 h experiment to examine the effect of time on the simulated deposit-enhanced PFBC corrosion on a number of different alloy chemistries; (5) completed optical examination of all the samples generated in this program and made a detailed analysis of selected samples; and (6) completed an initial hypothesis on a deposit-enhanced PFBC corrosion model, which needs further experimentation to confirm the key factors responsible for corrosion damage of metallic tubes in PFBC. 15 refs., 77 figs., 10 tabs.