Russia’s Prometheus Central Institute of Structural Materials has reported the use of ruthenium (Ru) for α-titanium alloy (Ti-Al-Zr), near-α-titanium alloy (Ti-Al-V-Mo) and near-β-titanium The alloy (Ti-Al-Mo-V-Fe-Cr) is modified by microalloying to prepare Ti-Al-Zr-Ru, Ti-Al-V-Mo-Ru and Ti-Al-Mo-V- Fe-Cr-Ru alloy has successfully improved the corrosion resistance of titanium alloy and is expected to be used in ship reactor steam generators, heat exchangers, ships and marine engineering equipment structures.
The results show that the high temperature molten salt corrosion resistance of Ti-Al-Zr-Ru alloy is one order of magnitude higher than that of the original alloy, and the crevice corrosion resistance and pitting corrosion resistance are also enhanced. The stress corrosion cracking resistance of Ti-Al-Mo-V-Fe-Cr-Ru alloy in 3.5% NaCl solution is improved by 17% compared with the original alloy. At present, a patented technology for the modification of ruthenium trichloride coating has been developed, and a test method for the crevice corrosion resistance, pitting corrosion resistance and stress corrosion cracking resistance of ruthenium-modified titanium alloy has been developed. The Institute also cooperated with Chepetsk Machinery Plant to produce a pilot product of cold-bent pipe based on Ti-Al-Zr-Ru alloy.
