In coal fired power plants, the metallic surfaces such as boiler tubes, walls of combustion chambers and other parts degrade by corrosion, erosion and abrasion. It happens due to the hot gaseous environment, steam oxidation and presence of hard minerals and impurities in the coal. It is very important to protect these surfaces from material loss, otherwise it would lead to increased repair and maintenance cost along with decreased plant efficiency. In this paper, the role of thermal spray coatings has been studied for the protection of different steel grades exposed to such degrading conditions at high temperatures, in coal-based power plants. A comprehensive study has been done by analysing and comparing the work done by various researchers. Some recent advancements related to coating materials and modification in coating techniques have also been studied. This paper would be helpful for the researchers to get an idea for selecting an appropriate substrate material and coating material for industrial applications.

中文翻译：

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热喷涂涂层在燃煤电厂中保护钢材免于降解的综述

在燃煤电厂中，金属表面（例如锅炉管，燃烧室的壁和其他部件）会因腐蚀，腐蚀和磨损而降解。它的发生是由于热气态环境、蒸汽氧化以及煤中存在硬矿物质和杂质。保护这些表面免受材料损失非常重要，否则会导致维修和保养成本增加以及工厂效率降低。在本文中，研究了热喷涂涂层在煤基发电厂中保护暴露于高温降解条件下的不同钢种的作用。通过分析和比较不同研究人员所做的工作，已经完成了一项综合研究。还研究了与涂层材料和涂层技术改性相关的一些最新进展。本文将有助于研究人员了解为工业应用选择合适的基材和涂层材料。