Corrosion resistance test of Ti70 alloy containing hydrogen

The effects of hydrogen content on the static full immersion corrosion property, dynamic immersion corrosion property, salt-spray fog corrosion property, electrochemical property and stress corrosion property of Ti70 alloy were studied. The results show that the corrosion rates of the three groups of samples with different hydrogen contents were close to 0 after soaking in artificial seawater for 672 h. The corrosion rates of the three groups of samples with different hydrogen contents were close to 0 after 720 h salt spray test. The corrosion rates of the three groups of samples with different hydrogen contents were close to 0 after 504 h of dynamic immersion test. Electrochemical tests were carried out on hydrogen-charged and uncharged samples, and it was found that the polarization curves were quite different. After hydrogen charging, the stress corrosion properties of the samples changed significantly. In the range of hydrogen content used in the experiment, the increase of hydrogen content in Ti70 alloy had no significant effect on its corrosion resistance. The reason was that the corrosion resistance of titanium alloy came from the surface dense oxide film. In the static immersion environment, the inhalation of hydrogen atoms would not affect the formation and self-healing of the surface passivation film, but the stress corrosion resistance of the material was poor. Under the action of force, the presence of hydrogen in titanium alloy would hinder the self-healing of surface passivation film.