STP664

    Erosion-Corrosion of Coatings and Superalloys in High-Velocity Hot Gases

    Published: Jan 1979


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    Abstract

    Degradation of nickel- and cobalt-base superalloys in corrosive, particleladen gas streams is being investigated by injecting salt and abrasive particles into a high-velocity combustor. The test conditions being used are intended to simulate the mechanism of materials degradation expected in coal-fired gas turbines where components will be subjected to hot corrosion from impurities in the coal and high-velocity impingement of fly ash particles. Oxidation-erosion experiments (with abrasive particles but no salt), considered a prerequisite for understanding the more complex case of erosion-hot corrosion, defined regimes of particle size and flux where the following situations were observed: (1) material loss predominantly by mechanical erosion, (2) material loss by an oxidation-erosion interaction, and (3) deposition of the solid particles on the leading edge of the cylindrical test specimens. A preliminary erosionhot corrosion experiment showed a marked interaction between sulfate-induced hot corrosion and particulate erosion; the rate of metal consumption was much greater than that attributable to the sum of erosion and hot corrosion processes acting alone.

    Keywords:

    erosion-corrosion, coatings, superalloys, oxidation, oxidation-erosion, hot corrosion, erosion-hot corrosion


    Author Information:

    Barklow, RH
    Assistant materials project engineers and senior staff scientist, Pratt & Whitney Aircraft, Middletown, Conn.

    Goebel, JA
    Assistant materials project engineers and senior staff scientist, Pratt & Whitney Aircraft, Middletown, Conn.

    Pettit, FS
    Assistant materials project engineers and senior staff scientist, Pratt & Whitney Aircraft, Middletown, Conn.


    Paper ID: STP35801S

    Committee/Subcommittee: G02.10

    DOI: 10.1520/STP35801S


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