Hybrid material hole sealing agent for improving corrosion resistance of plasma spraying coating in acid environment

A hybrid material hole sealing agent for improving corrosion resistance of a plasma spraying coating in acid environment is composed of the following components: ethyl orthosilicate, anhydrous ethanol, N,N-Dimethylformamide, Gama-methacryloxy propyl trimethoxyl silane, 25vol.% nitric acid, 25vol.% ammonia water and distilled water, wherein the proportion according to volume ration of ethyl orthosilicate to anhydrous ethanol to N,N-Dimethylformamide to distilled water to Gama-methacryloxy propyl trimethoxyl silane is equal to 4:3:1:(4-6), and the volume of N,N-Dimethylformamide is 20% to 30% of the total volume of ethyl orthosilicate, anhydrous ethanol, distilled water and Gama-methacryloxy propyl trimethoxyl silane; and the hybrid material hole sealing agent is prepared with a sol-gel method, wherein the 25vol.% nitric acid and 25vol.% ammonia water are used as pH regulators. The porosity factor of the plasma spraying coating processed by using the hybrid material hole sealing agent is reduced to 1/40 to 9/250 of that of a coating with unsealed holes, the electrochemical corrosion potential is increased by 65.2% to 65.8% of that of the coating with unsealed holes, and the corrosion current density is reduced to 1/370 to 1/500 of that of the coating with unsealed holes.