In this study, different thermal spraying materials including Fusible Ni-SA-a, Fusible Ni-SA-b, Fusible Ni-SA-c, NiCr-TS and NiCr-WEL which were coated on the surface of heat exchanger tubes were investigated to evaluate their effects on reduction of corrosion and ash deposition in Waste-to-Energy plants. Three corrosion tests including hightemperature wettability test, measurement of adhesion force and hot corrosion test were performed. The results indicated that the specimen coated with Fusible Ni-SA-c exhibited high contact angles in either air or simulated flue gas condition, which indicated a low ash wettability and liquid-bridge force. The low adhesion force between ash and the coatings of Fusible Ni-SA-b and Fusible Ni-SA-c illustrated their good performance to improve the tube corrosion resistance. Besides, the weight losses of specimens with coatings of Fusible Ni-SA-c and Fusible NiSA-b due to corrosion by ash were noticeably decreased, in particular Fusible Ni-SA-c resulted in the lowest surface corrosion. Fusible Ni-SAc caused the amount of ash deposition on the tube surface of SUS304 decrease by 35%. The combination results of these corrosion tests supported that Fusible Ni-SA-c as thermal spraying material exhibits