| Autor: | C. Bories, P. Pouderoux, Abel Rousset, S. Bruet-Hotellaz, Jean-Pierre Bonino |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Hydrogen
Chemistry General Chemical Engineering Phosphorus Inorganic chemistry Thermal desorption chemistry.chemical_element Amorphous solid law.invention chemistry.chemical_compound Adsorption Chemical engineering law Materials Chemistry Electrochemistry Thermal stability Crystallization Phosphorous acid |
| Zdroj: | Journal of Applied Electrochemistry. 27:1193-1197 |
| ISSN: | 0021-891X |
| DOI: | 10.1023/a:1018423701791 |
| Popis: | Ni–P alloys were electrodeposited from phosphorous acid solutions in order to study their thermostructural stability, thermal desorption, and dimensional modifications during heat treatments. The quantity of phosphorus codeposited is not a linear function of the bath phosphorous acid content. X-ray diffraction shows that three characteristic composition ranges can be defined. In the first, corresponding to a Ni–P solid solution containing up to 9at% of phosphorus, the microstructural refining is attended by a disappearance of the (100) preferential orientation. Simultaneously with this textural change, a slight adsorption of hydrogen is observed. Beyond 9at% of phosphorus, the microcrystallized alloys are preferentially oriented in the [111] direction, and the gradual amorphization of Ni–P alloys is attended by adsorption of a very high volume of hydrogen. Beyond 17at% of phosphorus, the alloys are amorphous and the amount of hydrogen included during the electrocrystallization is at its maximum. A large part of the hydrogen is desorbed before the crystallization temperature and less of it is desorbed during the crystallization. |
| Databáze: | OpenAIRE |
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