TA9 titanium alloy is a α -type titanium alloy made by adding a small amount of precious metal palladium to industrial pure titanium. The addition of palladium not only significantly improves the corrosion resistance of the alloy in reducing medium, but also improves its corrosion resistance in oxidation medium. 

TA9 alloy is good in high temperature and high concentration of various chloride-containing media. TA9 palladium titanium alloy also has similar properties similar to that of the industrial pure titanium brand, so the alloy is widely used in the chemical industry, especially in the petrochemical sector. 

Because the addition of palladium increases the cost of titanium material, the TA9 palladium titanium alloy is selected under the conditions that the industrial pure titanium cannot meet the use requirements. The main products of TA9 palladium titanium alloy are plate, rods, pipes, forgings and wire

TA9 alloy is mainly used in dilute hydrochloric acid, dilute sulfuric acid, dilute phosphoric acid environment, and also widely used in titanium equipment to prevent gap corrosion. For example, the tubular heat exchanger made of TA9 alloy used in dilute hydrochloric acid, sulfuric acid and phosphoric acid environment is used as parts such as wire spray head in the textile industry, titanium equipment flange lining ring and diamond gasket are widely made in acetaldehyde devices, and TA9 manufacturing parts such as flange and joint are also used in other devices. In addition, the alloy is also used as a structural material of the C2H2Cl2.

① also uses TA9 manufacturing equipment in nitric acid production. TA9 alloy should also be used for environments where oxidation and reductive conditions alternate. When this alloy is used on the sealing surface, 0.2 mm. If the TA9 combination is used in a 27%NH4Cl + 6.4%NaCl solution at 135 degrees Celsius, using this method can effectively prevent the gap corrosion of the titanium equipment.

② acetaldehyde is widely used in the synthesis of acetic acid, butanol, jtransitol and other basic chemical products. Acetaldehyde is produced by direct ethylene oxidation method, with palladium chloride and copper chloride as the catalyst to directly oxidize ethylene to acetaldehyde through air or oxygen. In the oxidation process, the reaction temperature is 100~150 degrees Celsius, the pressure is several or dozens of atmospheres, the solution PH value is 1.2~1.5 (strong acid), that is, the reaction is carried out in high temperature, high pressure, strong acid environment, resulting in production equipment (oxidation tower, distillation tower, pipes, pumps, valves) have received serious corrosion. Titanium has the corrosion inhibition effect of Cu2 + and O2 in the medium, which has good corrosion resistance and is suitable for making acetaldehyde production equipment.