Nickel-Molybdenum Ni84/Mo16 alloy represents a high-performance corrosion-resistant material combining nickel's passivity with molybdenum's exceptional resistance to pitting and crevice corrosion. This composition, closely related to Hastelloy® alloys, serves critical functions in chemical processing, marine environments, and catalytic applications where extreme corrosion resistance and high-temperature strength are essential.
Material Overview
Ni84/Mo16 exhibits exceptional corrosion resistance in reducing acids, particularly hydrochloric acid, where molybdenum additions dramatically enhance performance compared to pure nickel [1]. The alloy demonstrates tensile strength of 550-750 MPa with excellent ductility and toughness, maintaining mechanical properties from cryogenic temperatures to 800°C [2]. Electrical resistivity is approximately 95-105 μΩ·cm, significantly higher than pure nickel, while thermal conductivity reaches 10-12 W/(m·K). The material shows outstanding resistance to stress corrosion cracking and hydrogen embrittlement in chloride environments [3]. Density is approximately 9.2 g/cm³, with melting point around 1350°C. The alloy's catalytic activity for hydrogen evolution reaction surpasses pure nickel, making it valuable for electrochemical applications [4]. Fabricability is excellent, with the material readily weldable and formable through standard metalworking processes.
Applications and Advantages
Ni84/Mo16 serves in chemical processing equipment handling hydrochloric acid, sulfuric acid, and mixed acids where conventional stainless steels fail [1]. The material functions in pollution control scrubbers, flue gas desulfurization systems, and waste treatment facilities exposed to highly corrosive environments. Marine applications include seawater piping, heat exchangers, and offshore platform components requiring superior pitting and crevice corrosion resistance [3]. Catalytic applications utilize Ni-Mo alloys for hydrodesulfurization in petroleum refining and hydrogen evolution in water electrolysis [4]. The alloy serves in nuclear reactors and spent fuel reprocessing facilities handling nitric acid and other aggressive media. Pharmaceutical and fine chemical manufacturing employs Ni-Mo alloys for reactors and vessels requiring contamination-free processing [2]. Emerging applications include electrocatalysts for sustainable hydrogen production and CO₂ reduction. The material's combination of corrosion resistance and mechanical strength enables thinner-walled equipment designs, reducing material costs while maintaining safety margins.
Goodfellow Availability
Goodfellow supplies Nickel-Molybdenum Ni84/Mo16 alloy to meet demanding corrosion resistance and catalytic requirements. Custom specifications are available to support specialized chemical processing and electrochemical applications.
Explore Ni84/Mo16 and other advanced materials in Goodfellow's online catalogue: Goodfellow product finder.
References
- [1] Haynes International. (2020). Hastelloy® Alloy Technical Data. Haynes International, Inc.
- [2] Davis, J. R. (Ed.). (2000). Nickel, Cobalt, and Their Alloys. ASM International. https://doi.org/10.1361/ncta2000p001
- [3] Sedriks, A. J. (1996). Corrosion of Stainless Steels (2nd ed.). John Wiley & Sons. https://doi.org/10.1002/9780470316726
- [4] McKone, J. R., Sadtler, B. F., Werlang, C. A., et al. (2013). Ni–Mo nanopowders for efficient electrochemical hydrogen evolution. ACS Catalysis, 3(2), 166-169. https://doi.org/10.1021/cs300691c