Abstract
In this work, NiCrAlY coating was deposited on T-91 boiler tube steel by high velocity oxy fuel (HVOF)thermal spraying system. The comparative cyclic high temperature oxidation behavior of NiCrAlY coating with uncoated substrate has been investigated experimentally. The cyclic oxidation studies were carried out at 900 °C for 50 cycles. Each cycle consists of 1 hour heating in silicon carbide tube furnace followed by 20 minutes cooling in air. The kinetics of oxidation of coated and uncoated boiler steel has been established with weight change measurements after each cycle. The corrosion products were characterized by X-ray diffractometry, Scanning Electron Microscopy (SEM) and Electron Dispersive Spectroscopy (EDS). The NiCrAlY coating showed better resistance to high temperature oxidation and corrosion due to the formation of Al2O3, Cr2O3, NiO and CrO protective oxides which lead to a reduced rate of corrosion. The uncoated steel suffered high rate of corrosion in form of spallation and peeling of unprotected Fe2O3 oxide scale.
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