Accession Number : AD0619656

Title :   EFFECT OF JP-5 SULFUR CONTENT ON HOT CORROSION OF SUPER ALLOYS IN MARINE ENVIRONMENT.

Descriptive Note : Progress rept. no. 4,

Corporate Author : PHILLIPS PETROLEUM CO BARTLESVILLE OKLA RESEARCH DIV

Personal Author(s) : Quigg,H. T. ; Fromm,E. H. ; Schirmer,R. M.

Report Date : 28 JUL 1965

Pagination or Media Count : 120

Abstract : An experimental investigation was conducted to determine whether the maximum sulfur content of 0.4 weight per cent, currently allowed in grade JP-5 aviation turbine fuel, is a safe level for the protection of turbine blade alloys used in high-performance engines. Four nickel-base alloys (Udimet 500, Inco 713C, IN-100, and SM-200), one cobalt-base alloy (WI-52), and one aluminum coated alloy (MDC-1 on Inco 713C) were exposed to vitiated air from the Phillips 2-inch combustor (60 air-fuel ratio) at high pressure (15 atmospheres), high velocity (685 to 805 ft/sec) during a five hour cyclic test (55 minutes fuel on, 5 minutes fuel off). A statistically designed test was used to evaluate the effect of temperature (1800, 2000 and 2200F), fuel sulfur (0.0002, 0.04 and 0.4 weight per cent) and 'sea salt' in air (zero, 1.0 and 10.0 ppm). It can be concluded from these data at gas temperatures above the melting point of Na2S04 (1623 F) that an order of magnitude reduction in the 0.4 weight per cent sulfur limit to 0.04 weight per cent, which approaches the median of domestic production, would not reduce hot corrosion significantly in a marine environment. Rather, with some superalloys, such a reduction would aggravate a problem which already is at a catastrophic level at high 'sea salt' concentrations. Aluminum coating of Inco 713C resulted in a material immune to attack under the conditions investigated. (Author)

Descriptors :   (*SULFUR, AVIATION FUELS), (*NICKEL ALLOYS, CORROSION), (*COBALT ALLOYS, CORROSION), (*CORROSION, AVIATION FUELS), ENVIRONMENTAL TESTS, SEA WATER, GAS TURBINE BLADES, AIRCRAFT ENGINES, CORROSION RESISTANT ALLOYS, COMBUSTION PRODUCTS, CHROMIUM ALLOYS, MOLYBDENUM ALLOYS, TUNGSTEN ALLOYS, ALUMINUM ALLOYS, ALUMINUM COATINGS, ANALYSIS OF VARIANCE, TITANIUM ALLOYS, EXPERIMENTAL DATA, STATISTICAL ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE