ABSTRACT Hot corrosion and erosion are recognized as serious problems in coal based power generation
plants in India. The coal used in Indian power stations has large amounts of ash (about 50%)
which contain abrasive mineral species such as hard quartz (up to 15%) which increase the
erosion propensity of coal. Hot corrosion and erosion in boilers and related components are
responsible for huge losses, both direct and indirect, in power generation. An understanding of
these problems and thus to develop suitable protective system is essential for maximizing the
utilization of such components. These problems can be prevented by either changing the material
or altering the environment or by separating the component surface from the environment.
Corrosion prevention by the use of coatings for separating material from the environment is
gaining importance in surface engineering.
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