Abstract
A major part of the electric power is generated in coal operated thermal power plants which is operated by low rank fuel. During the operation of boilers with the high temperature combustion of low ranked fuel, few salt films are produced due to the presence of ash and abrasive minerals. This action produces the serious corrosion on the surface of boiler plates which is recognised as hot corrosion. A surface engineering method is used to encounter such problem in order to avoid repair and damage or economic loss such as high velocity oxy-fuel [HVOF] sprayed coatings. Various surface coating methods are being adopted for this purpose. Moreover, post heat treatment processes are also added in terms to retain the long period of surface coating.
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