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The hazards of corrosion in hydraulic metal structures mainly include multiple negative impacts on structural safety, economic costs, operational efficiency, and the ecological environment. Structural safety risks increase: Corrosion can cause metal materials to thin out and lose strength, leading even to localized perforation or fracture. For example, if load-bearing components such as main girders and side girders are weakened by corrosion by 35% to 40%, it may lead to serious safety incidents such as the instability or collapse of the gates. The economic losses are enormous: global annual maintenance costs resulting from corrosion of hydraulic steel structures exceed 9.2 billion dollars, of which about 40% is due to premature failure of coatings. China suffers annual corrosion losses of around 2 trillion yuan, with marine-related corrosion accounting for one-third of this amount (about 700 billion yuan). Resource waste and design redundancy: To address corrosion, engineering designs require higher safety factors, the use of thicker steel materials, or more frequent maintenance, resulting in unnecessary consumption of materials and labor. Potential environmental pollution risks: Corrosion products (such as rust) may contaminate water bodies and soil ； At the same time, if the coatings and chemical agents used in the anti-corrosion process are not properly managed, they can also pose ecological risks. Operational disruptions and cascading effects: Corrosion-induced damage to key facilities such as dam gates and irrigation systems can lead to their shutdown, affecting functions such as flood control, water supply, and navigation, and thereby causing indirect losses such as production halts.