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Platinum implantation into tantalum for protection against hydrogen embrittlement during corrosion

Ensinger, Wolfgang and Flege, Stefan and Baba, Koumei (2012):
Platinum implantation into tantalum for protection against hydrogen embrittlement during corrosion.
272, In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, pp. 441-445. Elsevier Science Publishing Company, [Article]

Abstract

Platinum is well known for its catalytic activity, even in small quantities. Among others, it catalyzes the recombination of hydrogen atoms to molecules and the desorption of the molecules from a surface. This favourable feature can be used to protect metals from detrimental hydrogen incorporation. This may take place in the case of tantalum when it corrodes in strong acids. Tantalum is a highly inert metal which can be used for devices and vessels for acid handling. When it is exposed to concentrated sulphuric acid, its corrosion rate is acceptably low. However, a side reaction may become problematic. When the metal is being dissolved, hydrogen is being formed at the metal surface at the same time. Being the smallest chemical element, hydrogen can easily diffuse into the metal lattice. There, is reacts to the metal hydride and may even form bubbles. By the phase change it creates pressure. The hydride is very brittle, and the metal can easily fail mechanically. In order to prevent catastrophic hydrogen embrittlement, small amounts of platinum were implanted into the surface of metallic tantalum and of tantalum coated with a protective oxide film. Depth profiles by secondary ion mass spectrometry showed that the platinum was located close to the surface; the implantation zone of the oxidized tantalum was considerably thicker than the one of the bare tantalum. Upon exposure to hot mineral acids, the untreated tantalum failed in mechanical tests due to embrittlement after short time, while the platinum-implanted one achieved considerably enhanced life-times. No difference was found between the bare and the oxide-coated tantalum.

Item Type: Article
Erschienen: 2012
Creators: Ensinger, Wolfgang and Flege, Stefan and Baba, Koumei
Title: Platinum implantation into tantalum for protection against hydrogen embrittlement during corrosion
Language: English
Abstract:

Platinum is well known for its catalytic activity, even in small quantities. Among others, it catalyzes the recombination of hydrogen atoms to molecules and the desorption of the molecules from a surface. This favourable feature can be used to protect metals from detrimental hydrogen incorporation. This may take place in the case of tantalum when it corrodes in strong acids. Tantalum is a highly inert metal which can be used for devices and vessels for acid handling. When it is exposed to concentrated sulphuric acid, its corrosion rate is acceptably low. However, a side reaction may become problematic. When the metal is being dissolved, hydrogen is being formed at the metal surface at the same time. Being the smallest chemical element, hydrogen can easily diffuse into the metal lattice. There, is reacts to the metal hydride and may even form bubbles. By the phase change it creates pressure. The hydride is very brittle, and the metal can easily fail mechanically. In order to prevent catastrophic hydrogen embrittlement, small amounts of platinum were implanted into the surface of metallic tantalum and of tantalum coated with a protective oxide film. Depth profiles by secondary ion mass spectrometry showed that the platinum was located close to the surface; the implantation zone of the oxidized tantalum was considerably thicker than the one of the bare tantalum. Upon exposure to hot mineral acids, the untreated tantalum failed in mechanical tests due to embrittlement after short time, while the platinum-implanted one achieved considerably enhanced life-times. No difference was found between the bare and the oxide-coated tantalum.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 272
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: Corrosion, Hydrogen embrittlement, Platinum, Tantalum
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 30 Dec 2011 08:29
Official URL: http://www.sciencedirect.com/science/article/pii/S0168583X11...
Additional Information:

Proceedings of the 17th International Conference on Ion Beam Modification of Materials (IBMM 2010)

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