EFFECT OF MANGANESE AND LEAD IN JP FUEL ON HOT CORROSION OF SUPERALLOYS IN MARINE ENVIRONMENT.
Progress rept. no. 4,
PHILLIPS PETROLEUM CO BARTLESVILLE OK RESEARCH DIV
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Methyl cyclopentadienyl manganese tricarbonyl CI-2 is being considered for use as a smoke suppressent additive in aviation-turbine JP fuel. Another organometallic material, tetraethyl lead TEL, was present in the Jet Mix used for carrier-based operation at one time and caused excessive deterioration of hot section components in aircraft-turbine engines. A screening investigation was conducted to evaluate the effect of manganese, relative to lead, in fuel on hot corrosion of turbine alloys in a marine environment. The six superalloys previously evaluated were included in the investigation using four levels of exhaust-gas temperature, two levels of sea salt in air, and two levels of sulfur in fuel. The concentration of CI-2 selected was ten times the concentration recommended for smoke suppression and the concentration of TEL was ten times the concentration used in Jet Mix. The significance of metal weight loss by test specimens was evaluated by statistical means, using a 95 per cent confidence level. The validity of metal weight loss data was established by metallographic examination of test specimens, which showed a correlation with depth of penetration and the absence of deep intercrystalline attack.