Gr11 titanium bar is an α-titanium alloy, whose process 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.
Ti-0.20pd residual 0.12-0.25 < 0.20 < 0.03 < 0.08 < 0.015 < 0.018
mechanical property：
Tensile strength: > 370mpa;
Yield strength: > 250Mpa;
Elongation after fracture: > 20%;
Reduction of area: > 25%
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 the corrosion resistance of Gr11 titanium bar (Ti-0.2Pd) in reducing media is significantly better than that of industrial pure titanium, and the weld zone of Gr11 titanium bar (Ti-0.2Pd) has the same corrosion resistance as the base metal.
Compared with de-aired hydrochloric acid in air-filled hydrochloric acid, Gr11 titanium bar (Ti-0.2Pd) has a significant positive shift in the stable potential, and the corrosion rate can be reduced by 10 times. However, in an acid solution filled with argon or nitrogen, new corrosion solutions or unit area tests are constantly replaced When the volume of the same solution increases, the passivation performance of Ti-0.2Pd will be significantly reduced, so it should be avoided to use Gr11 titanium bar (Ti-0.2Pd) in the absence of oxygen or oxidizer.
Adding a small amount of palladium to the GR11 titanium alloy improves 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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