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This presentation summarizes the development and expansion of a comprehensive information system for corrosion of metals and alloys in high temperature gases. New insights in analysis of thermochemical data for the Fe-Ni-Cr-Co-C-O-S-N system are being compiled. Corrosion mechanisms emphasized are oxidation, sulfidation, sulfidation/oxidation, and carburization.
This presentation summarizes the efforts to develop and expand a comprehensive information system for corrosion of metals and alloys in high temperature gases. The current data collection represents about 6.4 million hours of exposure time for about 4,900 tests with 80 alloys. Data are being generated at the rate of about one million exposure hours per year. The system manages/exploits corrosion data from well-defined exposures and determines corrosion product stabilities. New insights in the analysis of thermochemical data for the Fe-Ni-Cr-Co-C-O-S-N system are being compiled. All known phases based upon any combination of the elements are being analyzed to allow the most complete and accurate assessments of corrosion product stabilities. Use of these data will allow prediction of corrosion product stabilities, which can be used to deduce the likely corrosion mechanism. The program has uses in corrosion research, alloy development, failure analysis, lifetime prediction, and process operations. The corrosion mechanisms emphasized are oxidation, sulfidation, sulfidation/oxidation, and carburization.
Keywords: Oxidation, sulfidation, sulfidation/oxidation, carburization, high-temperature corrosion predictions, corrosion data compilation, engineering lifetime predictions
A case history is described involving microbiologically influenced corrosion (MIC) of AISI Type 304L stainless steel piping failure after being in contact with untreated stagnant, low chloride potable water for nine months. Specialized microbiological analysis techniques, including scanning electron and optical cmicroscopy, were used in the failure analysis.
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Results of inhibitor performance at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and scanning electrom microscope (SEM) techniques are used to reveal that the strong bubble impact, high shear stress and turbulent intensity are the reasons for a poor performance of inhibitor.
Service life of any weapon system depends upon factors that impart long-term durability and robustness to its structure and subsystems, while sustaining its functional properties. The paper describes basic principles and guidelines on corrosion control and rules that could be easily followed to ascertain some specified service life and reduce total ownership costs.