Corrosion of Ti-xSi alloys in marine water

DOI: 10.62564/M4-VT8450

Victor Talash, Mykola Kuzmenko, Julia Rudenko, Vira Shvets

Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine


Titanium alloys of the Ti-xSi double system with different silicon content are the basis for the creation of new complex-alloyed alloys for various functional purposes – corrosion-resistant, heat-resistant, heat-resistant, wear-resistant and biocompatible medical.[1]. Ti-xSi alloys were made on the basis of commercial alloy BT1-0 and silicon grade KR1 by plasma-arc method in an argon atmosphere. Electrochemical studies of the obtained alloys (Ti-1.1Si, Ti-3.6Si, Ti-5.7Si, and Ti-2.5Si-2.5Al) were carried in a 3% NaCl solution that simulates natural environments, marine water in particular [2]. The experiments have shown that all the resulting alloys are corrosion-resistant. The composition of Ti-5.7Si turned out to be the most corrosion-resistant among the studied alloys, the composition of Ti-1.Si was comparatively less stable, and the composition of Ti-3.6Si in terms of its corrosion resistance in seawater occupied a position between the first two. As the silicon content of Ti-xSi alloys increases, their corrosion resistance increases. The addition of aluminum in the amount of 2.5% to the Ti-2.5Si alloy leads to an increase in the corrosion resistance of this composition compared to other studied alloys in the range from the stationary potential to the beginning of the anodic dissolution process, after which the Ti-2.5Si-2.5Al alloy becomes similar to other studied Ti-xSi compositions in its corrosion resistance. The carried out studies have shown that the processes of formation of oxides of the component on the surfaces of nanofilms have a decisive role in the growth of corrosion resistance of Ti-xSi alloys.

Keywords
Ti-xSi alloys, electrochemical corrosion, nanofilms

Acknowledgments
Not provided

References
[1] M.M. Kuz`menko. Structure and mechanical properties of cast alloys of the Ti–Si system // Materials Science. – 2008. – Vol. 44, ,№1. – P. 49–53. [2] V. A. Lavrenko, V.N. Talash, V.V. Lashneva, N.N. Kuz`menko and M.A. Krasovskii. Interaction of Ti–6 wt.% Si alloy with tissue fluid: experimental modeling // Powder Metallurgy and Metal Ceramics. – 2010. – Vol. 49, № ½.– P. 94–98.