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Combined with the strong corrosion conditions of acid water tanks in oil refining units, titanium nanopolymer coating is an adaptive anti-corrosion coating with the best overall performance. It has been verified by engineering to achieve long-term anti-corrosion effect for nearly 5 years. Titanium nanopolymer coating has a temperature resistance of up to 70°C and can resist the erosion of complex media such as H₂S, NH₃, and phenols. It will not swell or bulge and break in 3-4 months like ordinary epoxy coatings. It is the most stable material in the coupon test. The adhesion of the cathodic protection alloy coating can reach 25.6MPa, and it contains active rare earth elements that can form stable sulfides with sulfur, greatly reducing the risk of sulfide stress corrosion cracking, and is suitable for working conditions with high humidity and hydrogen sulfide concentration. ZS-711 inorganic anti-corrosion coating with zinc-rich powder achieves cathodic protection. It has a salt spray resistance of over 4,000 hours, a hardness of 5H, and strong impermeability. It can effectively avoid hydrogen evolution corrosion and is suitable for long-term immersion conditions. RLHY-9035 anti-corrosion coating is an inorganic non-metallic environmentally friendly material that can form a dense isolation film to long-term resist erosion by media such as H₂S, acid and alkali, and is suitable for high-temperature hydrogen sulfide-containing flue gas and complex environments inside the tank.