Abstract
The corrosion behaviour of a FeCrAl alloy was investigated at 600 °C in O2 + H2O with solid KCl applied. A kinetics and microstructural investigation showed that KCl accelerates corrosion and that potassium chromate formation depletes the protective scale in Cr, thus triggering the formation of a fast-growing iron-rich scale. Iron oxide was found to grow both inward and outward, on either side of the initial oxide. A chromia layer is formed with time underneath the iron oxide. It was found that although the alloy does not form a continuous pure alumina scale at the investigated temperature, aluminium is, however, always enriched at the oxide/alloy interface.
Highlights
In the last decade several countries have moved towards reducing their dependency on fossil fuels
While the surface between the salt particles appears to be free from KCl, it has previously been found [29, 33] that small amounts of KCl are present in these areas
It is suggested that this pattern reflects the initial distribution of KCl on the surface, which results from the spraying procedure
Summary
In the last decade several countries have moved towards reducing their dependency on fossil fuels. Some European countries, e.g. Sweden, subsidises this type of environmentally friendly activities, thereby giving power plant owners an economic incentive to use this type of fuel. Power boiler maintenance costs might, increase since biomass and waste contain more water and alkali chloride than traditional fuel [1,2,3,4,5,6,7,8,9]. Super-heaters and water walls especially suffer from fireside corrosion This corrosive environment leads to lower operating temperatures in order to increase the lifetime of the components in the boiler. In order to increase the energy output, higher operating temperatures are needed, which results in an increase in demands for new material that can cope with this aggressive environment
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