No abstract

Hot corrosion is usually a significant issue in power plant's boilers. The alloys and metals get corroded, once exposed to high temperature corrosion in air, or in actual boiler environment in power plants. In order to protect materials; thermal spraying is a newly developed technology that enhances high temperature corrosion resistance of boiler steels. In the present study, WC-17Co coating were deposited by HVOF technique on substrate ASTM-SA213-T91. Subsequently; high temperature corrosion behavior of uncoated and WC-17Co coated substrate T91 was investigated in molten salt environment at an elevated temperature of 900⁰C for 50 cycles. The experimental cyclic study consisted a cycle of 1 hour heating of samples in SiC tube furnace, followed by 20 minutes of cooling in room temperature. Surface morphologies of corroded samples were carried out by SEM/EDS and XRD analysis. In the results, bare material is corroded with intense peeling and spalling. But on the other side, WC-17Co coating performed better than the uncoated steel substrate.