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Several Generation IV nuclear reactor concepts feature molten fluoride salt coolants. Corrosion of alloys in molten fluorides remains a challenge. Static exposure tests of nickel-based alloys and austenitic stainless steels were conducted in the molten fluoride salt known as FLiNaK.
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Test results for four alloys in six different sour environments are presented. Alloys 625, 825, 316L and carbon steel were testing in sour gas with varying exposure to moisture at 280°C. Corrosion rates for each alloy over a 30 day period are measured from mass and thickness changes.
Electrochemical techniques enabling real-time survey of corrosion, such as multi-electrode arrays sensors (MASS) and linear polarization resistance (LPR) were used to detect the differences in electrochemical behavior of two stainless steels.
Alloy N06044 was developed for applications in chemical process industry and coal fired boiler. In this paper, corrosion resistant properties of that alloy in acidic solutions are shown.
The work is mainly focused on the corrosion mechanism at low pH (>4) and the order of which the discontinuous and continuous intermetallic phases dissolve. Compositions of each phase, and the area ratio between intermetallic phases and the alpha matrix have been calculated as an average of 20 measurements.
Control of iron oxide deposits by using specific polymers is key to maintaining clean heat transfer surfaces and generating passive films within an industrial boiler.
UNS S31400 stainless steel was tested as a reactor material for a thermal cracking process of agricultural, silvicultural, industrial and anthropogenic resources containing HCl. This material was chosen as it offers proper corrosion resistance in hot gases besides a good price and a high availability.
Update on recent experiences from laboratory tests performed at service conditions for geothermal applications. Incorporated in a catalogue of suitable materials for applications geothermal power plants. Users shall be enabled to have a basis for designing such facilities.
In seawater handling systems, better dissolved oxygen controls would permit the use of more cost effective materials such as duplex stainless steel UNS S82551. Corrosion testing of tubes joined together with a proprietary premium threaded connection was performed in controlled seawater loops simulating service conditions at 30°C.
Development is needed for new materials to extend the life/reliability of surfaces used in geothermal turbines. Results of Tests and inspection of coatings on low carbon steel including; visual inspection, microstructural and chemical composition analysis with scannoing electro microscopy and energy dispersive x-ray spectroscopy.
Effects of initial crack aspect ratio, pipeline diameter, wall thickness, and loading conditions on the crack shape development were investigated. A new methodology for fatigue crack growth assessment is demonstrated. The study provides a refinement for more accurate prediction of remaining service life for pipelines.
Differences between temperate and tropical sites in terms of electrochemical behavior (e.g. open-circuit potential and cathodic current for oxygen reduction). One difference is critical temperature for biofilm ennoblement. Results are discussed in terms of risk for crevice corrosion for stainless steels in tropical seas.