EFFECT OF SULFUR IN JP-5 FUEL ON HOT CORROSION OF COATED SUPERALLOYS IN MARINE ENVIRONMENT
Abstract
An experimental investigation is in progress to determine whether the 0.4 per cent by weight of sulfur which is currently allowed in JP-5 fuel is a safe level for protection of coated turbine blades in high-performance engines when operated in a marine environment. Comparisons are made which show the effect of three different levels of sulfur in fuel, both with and without 1.0 ppm sea salt in air. A significant decrease in the relative rate of corrosion when sea salt was removed from the air shows it to be the primary cause of hot corrosion. These data indicate that little or no benefit would result from a reduction in the sulfur limit for JP-5 fuel. A screening program conducted at 2000 F conditions with 0.4 weight per cent sulfur in JP-5 fuel shows the presence of 0.063 ppm vanadium in air more than doubles hot corrosion attack on Inconel 713C specimens with either zero or 1.0 ppm sea salt in air and 0.017 ppm vanadium in air had no significant effect on hot corrosion of Inconel 713C specimens in the absence of sea salt in air. A screening program indicated that exposure times of several hundred hours or more would be required at some conditions to provide a meaningful evaluation of the effect of sulfur in fuel on hot corrosion of coated superalloys over a range of temperatures from 1400 - 2000 F.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1968
- Accession Number
- AD0834682
Entities
People
- H. T. Quigg
- R. M. Schirmer