Abstract:In order to realize the recycling and reprocessing of important hot-end parts, this study takes the DZ125 alloy high-pressure turbine outer ring block and blades as the research objects. Based on the physical and chemical properties of the coating and the bonding state of the substrate, the chemical method to remove the specimen-level thermal sprayed NiCrAlYSi coating was studied. In order to determine the removal effect of the coating, research on the composition and process of the pickling solution was conducted to obtain a suitable coating removal process. The interface state and the impact on the matrix structure during the entire process were detected and evaluated. It is found that after the coating is removed by this method, the pickling solution does not cause damage to the properties of the substrate and is suitable for use as a coating on such high-temperature alloys.