Metal Loss of Steam-Oxidized Alloys after Exposures at 675°C and 725°C for 500 Hours

Abstract

The paper reports metal loss data and general overview of steam oxidation behaviour of the selected alloys in water steam under atmospheric pressure in temperature range of 675–725°C. In this research, T22, T23, TP347HFG, HR3C and 718+ alloys were used. In this study, kinetics and metal loss data were obtained for better understanding corrosion degradation of the exposed materials. All the samples after 500-h exposure were characterized using environmental scanning electron microscopy (ESEM) in backscattered mode (BSE) with energy-dispersive x-ray spectroscopy (EDX). The results indicate that the highest corrosion degradation and metal loss were observed in T22, T23 alloys, moderate degradation was found in TP347HFG, whereas HR3C and 718+ nickel-based alloy showed good corrosion resistance.

Keywords

• steam oxidation
• metal loss
• high temperature
• alloy
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