Which materials are not suitable for water-cooled reactor metal chemical oxidation treatment

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1. Materials that are not suitable for chemical oxidation treatment of water-cooled reactor metals. Uranium metal and uranium-based alloys will completely lose the protective effect of the oxide film generated in water above 80°C. The corrosion rate will soar sharply above 100°C. The corrosion rate in water at 308°C can reach 6260 mg/(cm²·h). The hydrogenation reaction will also directly destroy the adhesion of the oxide film, making it impossible to form an effective protective layer through chemical oxidation treatment. Uranium carbide: Uranium carbide will directly undergo a hydrolysis reaction in high-temperature water to generate uranium dioxide, methane and other products. It will not form a continuous and dense protective oxide film throughout the process. The oxidation treatment will not have a protective effect at all, and will also accelerate material deterioration. Zirconium alloys with high niobium content (without tin element control) The oxidation behavior of this type of alloy is highly sensitive to the dissolved oxygen content. During the chemical oxidation process, ambient oxygen will promote the rapid conversion of Nb²⁺ to Nb⁵⁺, directly triggering the degradation and cracking of the oxide film, which will in turn significantly reduce the corrosion resistance of the material.