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Combined with the working conditions requirements for anodizing of water-cooled reactors mentioned earlier, the suitable metals need to meet both nuclear-level performance requirements and the feasibility of the anodizing process. They mainly include the following categories:: 1. Aluminum alloy core compatibility: The thermal neutron absorption cross-section is low and the radioactivity decays quickly after irradiation. It is a classic structural material for low and medium temperature water reactors. process suitability: A dense protective film can be formed through anodization, which can effectively improve the resistance to pitting corrosion in water-cooled environments below 100°C. 2. Magnesium alloy core suitability: The thermal neutron absorption cross-section is extremely low, and the mechanical properties meet the lightweight needs of some auxiliary components in the reactor. process suitability: Anodization can be completed in a special electrolyte, and the resulting oxide film can improve the corrosion resistance of magnesium alloys in a water environment. 3. Titanium alloy core compatibility: It is resistant to high temperature and high pressure water corrosion, has good compatibility with nuclear fuel, and is suitable for high temperature auxiliary structural parts in the reactor. process suitability: A stable oxide film can be formed through anodization to further enhance its corrosion resistance in the reactor water environment. 4. Zirconium alloy core compatibility: The thermal neutron absorption cross-section is only 0.18 nm, and it is the core material for the fuel cladding and pressure tube of water-cooled reactors. process suitability: After anodizing treatment, the annual corrosion rate can be reduced to 5% of that of pure zirconium, greatly improving the corrosion resistance under 300-400°C working conditions.