Abstract
This paper summarizes the development of an information system used to manage corrosion of metals and alloys by high temperature gases found in many different oil refining, petrochemical, power generation, and chemical processes. The database currently represents about 7.9 million h of exposure time for about 5,500 tests with 89 commercial alloys for a temperature range of 200 - 1,200°C. The system manages corrosion data from well-defined exposures and determines corrosion product stabilities. New models used in the analysis of thermochemical data for the Fe-Ni-Cr-Co-C-O-S-N-H system are being compiled. All known phases based upon combinations of the elements have been analyzed to allow complete assessments of corrosion product stabilities. Use of these data allows prediction of stable corrosion products and hence identification of the possible dominant corrosion mechanisms. The system has the potential to be used in corrosion research, alloy development, failure analysis, lifetime prediction, and process operations evaluations. The corrosion mechanisms emphasized are oxidation, sulfidation, sulfidation/oxidation, and carburization.
Highlights
This paper describes the development of a high-temperature corrosion information system
Corrosion Mechanisms The stable corrosion products are used to determine the names of the corrosion mechanisms discussed in this paper
The Center for Research in Computational Thermochemistry of Ecole Polytechnic de Montreal, evaluates available thermochemical data to produce consistent data sets. This will improve the accuracy of predictions of corrosion mechanism, by determining the most stable corrosion products formed by alloys in contact with the gas
Summary
This paper describes the development of a high-temperature corrosion information system. Examples are improvement in process safety, reduction in costs of maintenance of process operation, more cost-effective use of expensive alloys in equipment designs, reduction in the use of energy, moderation in the release of CO2 into the atmosphere and, more confidence in use of alloys in extreme operating conditions in terms of allowable temperatures and gas compositions. All of these benefits are expected as a direct result of accurate predictions of corrosion for a wide range of commercially available metals and alloys exposed to complex, high-temperature gases. The system uses thermochemical calculations to predict the stable corrosion products and the equilibrium gas composition for many environments
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