Effects of Additional Elements to MCrAlY Coatings in a Molten Chloride Environment
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In refuse incineration power generation plants, increasing the combustion temperature directly improves plant efficiency. However, due to molten chloride corrosion, the combustion temperature cannot be increased. Consequently, protecting of components from molten chloride corrosion is necessary. In this study, MCrAlY coating was proposed as a protective film against molten chloride corrosion. And also the effects of adding elements to CoNiCrAlY were examined. Four kinds of specimens were prepared. One is a standard CoNiCrAlY coated specimen. The others are Mo blended CoNiCrAlY, mechanically milled CoNiCrAlY, and mechanically alloyed CoNiCrAlY with Mo specimens. These coatings were made by low pressure plasma spraying (LPPS). The specimens were exposed to molten chloride corrosion tests in a NaCl-KCl environment. The results show that mechanically alloyed CoNiCrAlY with Mo has excellent corrosion resistantance.
