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

reportActive / Technical Report | Accession Number: ADA331070 | Open PDF

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 TGAS03 equilibrium technique that could potentially be used to chart the V2O5 activity in vanadate-sulfate melts over a wide range of NaV 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 NaV 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

Author(s):
Jones, Robert L. ; Reidy, Richard F.
Author Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC
Descriptive Note:
Conference proceedings,
Supplementary Note:
Presented at the Tri-Service Conference on Corrosion Held in Orlando, FL on 21-23 Jun 94.
Pagination:
0012

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
AF/TRI-SER
 Subject Terms
Joint Capability Areas:
JCA_6.4.1_Secure Information Exchange; JCA_5_Command and Control; JCA_6.4_Information Assurance; JCA_6_Net Centric; JCA_1.2.7_Experimentation
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*SYMPOSIA, *THERMODYNAMICS, *FUELS, *THERMOGRAVIMETRIC ANALYSIS, CORROSION, COMBUSTION, VANADIUM COMPOUNDS, SULFATES, PARTIAL PRESSURE, CERIUM COMPOUNDS, VANADATES
Field(s)/Group(s):
Physical Chemistry, Properties of Metals and Alloys, Fuels
Keyword(s):
*VANADIUM OXIDES, *VANADATE SULFATE MELTS, TRI SERVICE CONFERENCE ON CORROSION, CERIUM OXIDES
Report Date:
1994 Jun 23
Creation Date:
1997 Nov 12