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TA9 (Ti-0.2Pd) titanium alloy is an excellent corrosion-resistant titanium alloy; it is an α-type titanium alloy obtained by adding a small amount of the precious metal palladium to industrially pure titanium. The addition of palladium not only significantly improved the corrosion resistance of the alloy in reducing media, but also enhanced its corrosion resistance in oxidizing media. In various chloride-containing media at high temperatures and high concentrations, the TA9 alloy exhibits the best resistance to crevice corrosion. TA9 also has applications similar to those of various grades of industrially pure titanium. Since the addition of Pd increases the cost of titanium materials, TA9 is chosen when industrial pure titanium fails to meet the required specifications. TA9 alloy is mainly used in environments with dilute hydrochloric acid, dilute sulfuric acid, and dilute phosphoric acid, and it is also widely used in titanium equipment to prevent crevice corrosion. It can be used in components such as shell-and-tube heat exchangers and spinnerets in the textile industry. In acetaldehyde plants, TA9 is widely used to manufacture titanium flange linings and diamond gaskets, etc.; in other plants, it is also used to produce gap-containing components such as flanges and joints. This alloy is also used as a structural material for C2H2Cl2. The main products of TA9 titanium alloy include sheets, bars, tubes, forgings, and wires. A similar foreign grade is Gr.7 (USA).