Hot corrosion and performance of nickel-based coatings

Understanding the behaviour of metals and alloys at elevated temperatures, especially their corrosion behaviour and providing protective surface layers has become an object of scientific investigation since long. No alloy is immune to hot corrosion attack indefinitely, although there are some alloy compositions that require a long initiation time at which the hot corrosion process moves from the initiation stage to the propagation stage. Nickel-based coatings have been reported to be widely used as they combine several advantages such as abrasion, erosion and resistance to high-temperature corrosive atmospheres. In this article, a brief review of the performance of nickel-based coatings has been made to understand their hot corrosion mechanism.

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