Perpustakaan Digital ITB

This study investigates the hot corrosion behaviour of four types of steel (SS 316- L, SS 316-Ti, SS 316-H, and SA 335 Grade P12) when immersed in molten FLiNaK salt at a temperature of 700°C. The significance of the study was related to the growing global demand for energy and the need of alternative energy sources. Molten Salt Reactors (MSRs) are a highly promising technology that can significantly reduce carbon emissions. However, further studies are required to analyse the capabilities of the vessel for MSRs, which need to have high corrosion resistance. The purposes of the study are to determine the change in mass, the hot corrosion mechanism, as well as comparing the corrosion resistance of the alloys mentioned above. The research methodology utilised a sequence of hot corrosion test, with time interval varying of 24, 48, 72, 96, and 240 hours. The samples were prepared by the processes of cutting, grinding, and determining the initial weight and surface area. The corrosion rate was determined by monitoring the loss in mass of the samples for each time intervals. The study also utilised SEM-EDS analysis to characterise the corrosion attack on the samples. The objective of the research was to assess the extent of corrosion resulting from hot corrosion test and analyse the relative corrosion resistance of different types of steel. The results of the study indicate that the corrosion rate of the alloys showed variation. The corrosion rate of SS 316-Ti exhibited the minimum corrosion rate which is 0.38 mm/year, whereas SA 335 P12 demonstrates the maximum corrosion rate which is 2.19 mm/year. The SEM-EDS analysis indicated that the corrosion attack was mostly caused by the preferential dissolution of chromium, followed by iron, which aligns with Forsberg's thermodynamic studies. SS 316-Ti also contains nickel, which enhances the corrosion resistance of the alloy. Conversely, the SA 335 P12 alloy did not include any nickel constituent.