Abstract
The future thermal power plant is expected to operate at higher temperature to improve its efficiency and to reduce greenhouse gas emission. This target requires better corrosion properties of ferritic steels, which commonly used as materials for superheater and reheater of boiler tubes. In this work, chromium enrichment on the surface of ferritic steel is studied. The deposited chromium is expected to become a reservoir for the formation of chromia protective layer. Chromium was deposited on the substrate of steel by pack cementation process for two hours at the temperature of 850oC, 950oC and 1050oC, respectively. XRD analysis indicated that chromium was successfully deposited at all temperatures. Somehow, SEM cross sectional image showed that continuous layer of chromium was not continuously formed at 850oC. Therefore, this research clarify that chromium enrichment by pack cementation may be conducted at the temperature above 950oC
Highlights
Nowadays, world is facing environmental impact caused by the greenhouse gasses emission from fossil fuel combustion
The reductions can be done by using low- or zero-carbon energy sources such as renewables energy: wind, hydro and others [2], but for the current stage, fossil fuel power plant is very important in power generation
In order to reduce the emissions of greenhouse gases from fossil fuel power plant, increasing thermal efficiency will be one of the solutions [5]
Summary
World is facing environmental impact caused by the greenhouse gasses emission from fossil fuel combustion. In order to reduce the emissions of greenhouse gases from fossil fuel power plant, increasing thermal efficiency will be one of the solutions [5]. The improvement of thermal efficiency of power plant may be realized by increasing its operating temperature. This condition may lead to more excessive corrosion, especially in boiler components which exposed to high pressure and high temperature steam. Many researchers have reported that oxidation rate of this steel in steam condition was faster that dry atmosphere [6,7,8]. Improvement of corrosion resistant of this steel is important in order to use this material at higher operating temperature
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