Performance of Commercial Alloys in Simulated Waste Incineration Environments

Abstract

Abstract Commercial nickel-containing alloys have been exposed to simulated waste incineration conditions, comprising simulated flue gas and applied salt coatings, at 550° and 650°C using an inlet gas mixture comprised of N2-10% O2-10% CO2-20%H2O-1500ppm HCl-300ppm SO2. Samples were tested at 550° and 650°C after application of salt mixtures to the sample surface. The first salt mixture contained 20% ZnCl2, 40.9% PbCl2, 21.9% KCl, and 17.2% NaCl by weight while the second mixture contained 4.7% ZnCl2, 9.7% PbCl2, 2% KCl, 2.6% NaCl, 6.1% K2SO4, 4.9% Na2SO4 and 70% Al2O3 by weight. Testing at 650° was conducted with and without application of the first salt mixture to the surface. Testing at 550°C was conducted with application of each salt mixture, respectively. Corrosion performance has been evaluated metallographically and related to alloy composition using multiple regression analysis.