Protection Principle of Nano Fluorosilicon Permeable Film-forming Coating. This coating protects concrete, enhances its durability, and extends its service life. It involves spraying, rolling, or brushing a silane emulsion onto the concrete to reduce the water absorption rate of the concrete structure, blocking liquid water from entering the concrete, thereby reducing water (deicing salt) corrosion of the concrete. Octyl silane impregnating agent reduces the water absorption rate of the concrete structure, preventing harmful substances (deicing salts, carbon dioxide, weak acids, etc.) from entering the concrete with water molecules, which could damage the alkaline environment of the concrete and cause steel corrosion, pitting, exposed reinforcement, and structural damage. Silane penetrates the concrete, where the silanol groups in its molecules react with silicates in the concrete, forming a stable and robust permanent protective layer for the concrete structure. 2