High-Temperature Corrosion in Gas Turbines and Steam Boilers by Fuel Impurities: IV—Evaluation of Silicon and Magnesium-Silicon as Corrosion Inhibitors

The corrosion rates of Udimet™ 500 in a variety of sodium sulfate-silica-vanadium pentoxide and sodium sulfate-magnesium sulfate-silica-vanadium pentoxide slag compositions were measured electrochemically at temperatures up to 950 deg. The weight ratios of the elements, sodium, silicon, and magnesium to vanadium were defined for acceptable corrosion rates. A simple burner test for slag evaluation is described. Characteristics of slags produced by magnesium, silicon, and magnesium-silicon in conjunction with sodium sulfate and vanadium pentoxide are discussed. Results indicate that the magnesium-silicon combination produces a slag which is equally as low as magnesium in corrosivity and superior in slag characteristics.