Investigation Of Corrosıon Behavior Of Iron-Based Superalloys In Salt Bath

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Thesis Type: Postgraduate

Institution Of The Thesis: Gazi University, Turkey

Approval Date: 2015

Thesis Language: Turkish

Student: Sinan SARIKÖSE

Supervisor: RAMAZAN ÇITAK

Abstract:

Super alloys with corrosion and creep resistance are often used in high temperature applications. The salt baths are used for heat treatment of metals. The most important problem in the salth bath is the corrosion of pot and the other equipment. In this study, corrosion behavior of iron based PM2000 superalloy in barium chloride and calcium chloride mixture salt was examined. Corrosion tests were carried out with ten cycles; 24 hours in salt bath, 24 hours in normal atmosphere at three different temperatures; 550, 600 and 650°C. Veight loss and microstructure were inventigated after corrosion tests. In first a few cycles no visible changes were determined in microstructure while diffusion of Ba and Ca in structure was determined. It has been determined that Ba, Al and oxygen formed BaAl2O4 and this compound segregated from the surface resulting weight loss. Visible changes took place in microstructure with increasing cycles.