A Determination of V205 Activity in Corrosive Molten Vanadate-Sulfate Phases.

Abstract

Although aggressive hot corrosion by molten vanadate-sulfate deposits in boilers and engines burning low-quality fuel has been known for 75 years or more, there is surprisingly little data in the literature on the thermochemistry of Vanadate-sulfate melts, especially as to the activity of the corrosive V2O5 component. We have recently devised a thermogravimetric (TGA)/S03 equilibrium technique that could potentially be used to 'chart' the V2O5 activity in vanadate-sulfate melts over a wide range of Na/V ratios, SO3 partial pressures and temperatures. The method is illustrated in a study of the reaction of CeO2 with a NaVO3-Na2SO4-V2O5-SO3 melt system (Na/V = 1) at 800 deg C. Results from the study define the conditions under which CeO2 will be chemically nonreactive with the melt, and also show the V2O5 activity coefficient to be, for the given experimental conditions, of the order of 0.01

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Document Details

Document Type
Technical Report
Publication Date
Jun 23, 1994
Accession Number
ADA331070

Entities

People

  • Richard F. Reidy
  • Robert L. Jones

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Additives (Chemicals)
  • Body Weight
  • Chemical Reaction Properties
  • Chemical Reactions
  • Chemistry
  • Coefficients
  • Combustion
  • Corrosion
  • Elements
  • Equations
  • Fuel Additives
  • High Temperature
  • Military Research
  • Partial Pressure
  • Turbines
  • Vanadium Compounds

Fields of Study

  • Materials science

Readers

  • Explosive Engineering.
  • Surface Engineering/Surface Coating Technology.
  • Systems Analysis and Design