Titanium/Palladium (Ti99.85/Pd0.15) is a high-purity titanium alloy enhanced with a small addition of palladium to significantly improve corrosion resistance while maintaining titanium’s hallmark strength-to-weight ratio and biocompatibility. This alloy offers superior performance in aggressive and fluctuating environments, making it indispensable in chemical processing, marine engineering, and biomedical applications (Austral Wright, 2022; Zitter et al., 1965).
Material Overview
Physically, Ti99.85/Pd0.15 retains the low density (approximately two-thirds that of steel) and high tensile strength characteristic of pure titanium, offering exceptional mechanical performance with minimal weight. The alloy’s elastic modulus and fatigue strength remain comparable to those of commercially pure titanium grades, while the palladium addition enhances its electrochemical stability and longevity in corrosive environments (Lowrie, 2009; Gui et al., 2019).
Chemically, the addition of 0.15% palladium dramatically increases titanium’s resistance to crevice corrosion and pitting corrosion, particularly in chloride-rich and acidic media. The formation of a noble metal-stabilized passive oxide layer provides protection under both oxidizing and reducing conditions. This mechanism enables Ti99.85/Pd0.15 to outperform unalloyed titanium in environments such as seawater, hydrochloric acid, and hot brines (Kamikubo et al., 1986; Rüdinger, 1965).
Processing and Microstructure
Ti99.85/Pd0.15 is typically processed through conventional titanium metallurgical techniques, including hot forging, rolling, and annealing. The fine-grained microstructure produced during fabrication promotes uniform mechanical behavior and excellent corrosion resistance. The homogeneous distribution of palladium within the titanium matrix ensures stability even after extended exposure to aggressive environments (Zitter et al., 1965).
Applications and Advantages
Chemical processing and marine environments. Ti99.85/Pd0.15 is widely employed in heat exchangers, piping systems, and reactor vessels where exposure to strong acids or saline solutions occurs. The palladium addition prevents localized corrosion and maintains the integrity of welded joints, making it a preferred material for crude oil refineries and seawater desalination systems (Yashiki & Ohyama, 1999).
Aerospace and structural engineering. With its high strength-to-weight ratio and resistance to oxidation, Ti99.85/Pd0.15 serves in aircraft structures, fasteners, and springs where mechanical reliability is critical under fluctuating temperatures and stress conditions (Gui et al., 2019; Williams & Belov, 1982).
Biomedical applications. The alloy’s biocompatibility and corrosion resistance in bodily fluids make it suitable for surgical implants and dental components. The addition of palladium enhances stability against localized corrosion, ensuring long-term implant performance (Zhi et al., 2004).
Performance Benefits
- Outstanding corrosion resistance in oxidizing and reducing media.
- Superior crevice and pitting corrosion resistance in chloride environments.
- High strength-to-weight ratio with low density (~4.5 g/cm³).
- Excellent biocompatibility and fatigue resistance.
- Stable passive oxide film for long-term durability.
Goodfellow Availability
Goodfellow supplies Titanium/Palladium (Ti99.85/Pd0.15) in multiple forms, including sheet, rod, wire, and foil, for research and industrial use. This alloy is ideal for corrosive environments, high-performance structural applications, and biomedical engineering where durability and chemical stability are critical.
Explore Titanium/Palladium (Ti99.85/Pd0.15) and related titanium alloys in Goodfellow’s online catalogue: Goodfellow product finder.
References
- Austral Wright. (2022). Titanium Grade 7 (UNS R52400). Alloy Digest. https://doi.org/10.31399/asm.ad.ti0186
- Zitter, H., Matzer, F., & Kraxner, G. (1965). Korrosionseigenschaften von Reintitan und einer Titan-Palladium-Legierung. Materials and Corrosion – Werkstoffe und Korrosion. https://doi.org/10.1002/MACO.19650160902
- Lowrie, N. (2009). Chapter 44: Titanium. https://doi.org/10.1680/mocm.35973.0527
- Gui, N., Song, T., & Qian, M. (2019). Titanium Springs and Fasteners. https://doi.org/10.1016/B978-0-12-815820-3.00015-0
- Kamikubo, F., Satoh, H., & Shimogori, K. (1986). Performance and Usage of Titanium Materials Resistant to Crevice Corrosion. Tetsu To Hagane – Journal of The Iron and Steel Institute of Japan. https://doi.org/10.2355/TETSUTOHAGANE1955.72.6_701
- Yashiki, T., & Ohyama, H. (1999). Corrosion-Resistant Titanium Alloy Used for Heat Exchange Pipes in Crude Oil Refineries.
- Rüdinger, K. (1965). Technologische Eigenschaften und Korrosionsverhalten einer Titan-Legierung mit 0.2% Palladium. Materials and Corrosion – Werkstoffe und Korrosion. https://doi.org/10.1002/MACO.19650160204
- Zhi, J., Yu, L., & Haitao, L. (2004). Medical Used Titanium Alloy for Surgery Implantation Material.
- Williams, J. C., & Belov, A. F. (1982). Titanium and Titanium Alloys: Scientific and Technological Aspects.