It is important to introduce efficiency improvements at refuse incineration power generation plants. Corrosion problems at the plants have obstructed the improvement of efficiency. Especially, molten chloride corrosion is a serious problem. Consequently, protection of components from molten chloride corrosion is necessary. CoNiCrAlY sprayed coating is proposed as a protective film against the problem of molten chloride corrosion. Furthermore, the improvement of adding Mo to CoNiCrAlY is examined. CoNiCrAlY with Mo powder was prepared by the mechanical alloying (MA) applied in the mixture. The result of Corrosion testing, which was performed at 650^oC for 24 and 100 hours in NaCl-KCl=1/1 mole molten chloride, shows that CoNiCrAlY coatings have good corrosion resistance compared to Inconel 625 Ni base super alloy. Furthermore, MA modified the CoNiCrAlY coating with Mo has improved corrosion resistant properties.