Corrosion resistance of TA9 titanium rods in various corrosive environments

               
Update: 17-05-2021
               
Abst:

TA9 is an α-titanium alloy, and its process performance […]

TA9 is an α-titanium alloy, and its process performance and mechanical properties are similar to those of industrial pure titanium. When the amount of Pd added to titanium reaches 0.1%-0.2%, the corrosion rate of titanium in sulfuric acid and hydrochloric acid is significantly reduced, and the Pd content is further increased, and the corrosion rate of the alloy is almost unchanged, and when the Pd content is less than 0.05% , The corrosion rate increases instead. When the acid concentration is low, the titanium-palladium alloy containing 0.13% Pd has satisfactory corrosion resistance, but when the acid concentration is high, Ti-0.2Pd has better corrosion resistance, so Ti-0.2Pd is more For appropriate.
  The data shows that Ti-0.2Pd has significantly better corrosion resistance in reducing media than industrial pure titanium, and the weld zone of Ti-0.2Pd has the same corrosion resistance as the base material. Compared with de-aired hydrochloric acid in air-filled hydrochloric acid, Ti-0.2Pd has a significant positive shift of the stable potential, and the corrosion rate can be reduced by 10 times. However, in an acid solution filled with argon or nitrogen, the corrosion solution is constantly replaced or the unit area is tested. When the volume of the same solution increases, the passivation performance of Ti-0.2Pd is significantly reduced, so it should be avoided to use Ti-0.2Pd. TA9 titanium alloy in the absence of oxygen or oxidizing agent. Adding a small amount of palladium to improve the oxidizing medium In the corrosion resistance, especially the ability to resist crevice corrosion. Therefore, it is widely used in the corrosive medium of hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, and chloride.

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