Limits of Substitution of Titanium for Tantalum In Corrosion Resistant Alloys

Bishop, C. R.; Powell, RW

doi:10.5006/0010-9312-18.6.205

Cited by 17 publications

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“…Zr offers better corrosion resistance than Ti in acids without fluoride ions, while Ti is better suited in acidic fluoride media. Compared to Ti and Zr, both Ta and Nb is considered to offer better resistance to corrosion in most acidic environment, [25][26][27] with Ta offering the highest protection. However, the higher cost and constraints in supply limit the usage of Ta and Nb in most of the industrial fields.…”

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confidence: 99%

Studies on Group IV and V Valve Metal Corrosion in Acidic Fluoride Media

Rao¹,

Meethal²,

Amrutha³

et al. 2020

J. Electrochem. Soc.

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Dissolution rates of Ti, Zr, Nb and Ta in acidic fluoride media of different concentrations at various temperatures were measured by weight loss method, and were complemented by electrochemical measurements at room temperatures. A mathematical model to estimate the corrosion rate of these four valve metals based on the overall reaction mechanism for metal dissolution as well as H2 evolution is developed from the weight loss experiments. Valve metal dissolution process occurs through two independent pathways assisted by (HF2)− and equilibrium HF species. Except Ti, the dissolution of other valve metals studied are not significantly influenced by the H2 evolution reaction. Among the four metals evaluated, Nb offers the best corrosion resistance at high temperature and high HF concentration. The corrosion resistance of all four valve metals estimated from linear polarization, electrochemical spectroscopy and Tafel extrapolation in various concentrations of solutions match well. For Ti, dissolution rates calculated from Tafel extrapolation were lower than those based on weight loss experiments, while for Zr, Nb and Ta, they were mostly higher than those based on weight loss experiments.

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mentioning

confidence: 99%

Studies on Group IV and V Valve Metal Corrosion in Acidic Fluoride Media

Rao¹,

Meethal²,

Amrutha³

et al. 2020

J. Electrochem. Soc.

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Beitrag zum physikalischen und korrosionschemischen Verhalten von IVa‐Metallegierungen

Kieffer¹,

Binder²,

Bach³

1968

Materials & Corrosion

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Die Beständigkeit des Titans gegenüber nichtoxidierenden Säuren läßt sich durch Zulegieren von Zr, Hf, Nb, Mo und Re z.T. beträchtlich steigern. Bei Zr, Hf, Nb and Ta wird eine entscheidende Verbesserung des Korrosionsverhaltens erst bei Gehalten von mehr als 50 At.‐% dieser Metalle in den Legierungen erreicht. Molybdän wirkt schon bei Gehalten ab 20% stark passivierend; die Verbesserung der Korrosionseigenschaften muß aber durch schlechtere Verarbeitbarkeit erkauft werden. Ein besonders wirksamer Legierungszusatz, schon in geringen Mengen, ist das Rhenium. Als ganz hervorragend korrosionsbeständig und gleichzeitig gut verarbeitbar erwiesen sich ternäre Ti‐Mo‐Ta‐Legierungen (Mo + Ta 20 At.‐%) bzw. eine Ti‐12Mo‐1Re‐Legierung. Die gute Zunderbeständigkeit des Titans wird durch Zulegieren von Zr, Hf, V, Cr und Mo z. T. ganz wesentlich herabgesetzt. Verbessernd wirken Nb, W und vor allem Ta in geringen Mengen. Ti‐Ta‐Legierungen mit Ta‐Gehalten bis 10 At.‐% sind noch bei 900° C gut zunderbeständig.

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Electrochemical behavior of titanium‐tantalum alloys in sulfuric acid solutions

Souza¹,

Robin²

2004

Materials & Corrosion

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Titanium exhibits a good corrosion resistance in oxidizing acids and neutral media but it is severely attacked in reducing acids. On the contrary, tantalum presents an excellent resistance in both oxidizing and reducing acids, but its high cost limits its use to very aggressive conditions. The titanium-tantalum alloys are promising materials for use in reducing acids, due to their lower cost and density when compared to tantalum, and their higher corrosion resistance when compared to titanium. Titanium-20, 40, 60 and 80 wt% tantalum alloys were prepared by arc-melting and their microstructures were characterized by scanning electron microscopy and Xray diffractometry. Their electrochemical behaviors were studied in 20 to 80 wt% sulfuric acid solutions at room temperature, using open-circuit potential measurements, potentiodynamic polarization and electrochemical impedance spectroscopy. Different behaviors were observed depending on the tantalum content and acid concentration. A clear tendency of increase in corrosion resistance with the increase of tantalum content is observed, especially in 80 wt% sulfuric acid solutions.

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Limits of Substitution of Titanium for Tantalum In Corrosion Resistant Alloys

Cited by 17 publications

References 0 publications

Studies on Group IV and V Valve Metal Corrosion in Acidic Fluoride Media

Studies on Group IV and V Valve Metal Corrosion in Acidic Fluoride Media

Beitrag zum physikalischen und korrosionschemischen Verhalten von IVa‐Metallegierungen

Electrochemical behavior of titanium‐tantalum alloys in sulfuric acid solutions

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