The Influence of Aggressive Environment with a High Content of Fluoride Ions on the Alloy TiAl6V4 with a Protective Ti-Al-Si Layer

Abstract:

This work presents results on the influence of fluoride ions on the behavior of layers whose main component is the phase TiAl_0.3Si_1.7 (called t2 phase), formed on TiAl6V4 substrate. Layers were prepared in AlSi20 melt at 650 ° C for 60 min. Potentiodynamic curves were measured in a chloride solution with 0 and 5000 ppm fluoride. Layer were shifted corrosion potential to more negative values and at the some time reduce the corrosion current density (Im). Values of Im are in the potential range of 300 – 1500 mV (SCE) for TiAl6V4 with Ti-Al-Si layers significantly lower in comparison with Im values found for TiAl6V4 in chloride solution containing 5000 F^-. The electrochemical tests showed that Ti-Al-Si layer had marked positive effect on corrosion resistance of TiAl6V4 alloys in aggressive environment with high content of F^-.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 966-969
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.966
• Online since: July 2011
• Authors: Tomáš Kubatík, Marcela Kadlecová, Boleslav Eremiáš, Eva Kalabisová
• Keywords: Fluoride Ion, Liquid Phase Siliconizing, Potentiodynamic Scan, Silicido-Aluminide Layer, TiAl6V4

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