Corrosion resistance of GR7 titanium bars in a variety of corrosive environments

GR7 titanium bar is a titanium alloy, and its technical 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 content of Pd is further increased. The corrosion rate of the alloy is almost unchanged, while the corrosion rate increases when the content of Pd is lower than 0.05%. At low acid concentration, titanium palladium alloy containing 0.13%Pd had satisfactory corrosion resistance, but at high acid concentration, ti-0.2 Pd had better corrosion resistance, so ti-0.2 Pd was more suitable.

The data show that the corrosion resistance of ti-0.2pd in reducing medium is obviously better than that of industrial pure titanium, and the welding area of ti-0.2pd is the same as that of the base material. Ti – 0.2 – Pd in charge of hydrochloric acid and the air in the air compared with steady potential significant positive move, corrosion speed could drop by 10 times, but in the acid solution of argon or nitrogen filling, constantly changing new corrosion solution or sample solution volume increase per unit area, the passivation performance of Ti – 0.2 – Pd declined obviously, therefore should be avoided under the condition of anaerobic or oxidant completely using Ti – 0.2 Pd. Adding a small amount of palladium TA9 titanium alloy corrosion resistance in oxidizing medium is improved, especially the crevice corrosion resistance. Therefore, it is widely used in the corrosion media of hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid and chloride.

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