A critical review and experimental analysis of the equation recommended by ASTM G148-97 and ISO 17081: 2004 for the calculation of the hydrogen diffusivity in metals and alloys
Autor: | Bruno Allison Araújo, E.O. Vilar, J.P.D. Carvalho |
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Rok vydání: | 2017 |
Předmět: |
Work (thermodynamics)
Chemical substance Hydrogen Renewable Energy Sustainability and the Environment 05 social sciences Energy Engineering and Power Technology chemistry.chemical_element Thermodynamics Experimental data 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Thermal diffusivity Electrochemistry Fuel Technology chemistry 0502 economics and business 050207 economics 0210 nano-technology Hydrogen embrittlement Hydrogen permeation |
Zdroj: | International Journal of Hydrogen Energy. 42:681-688 |
ISSN: | 0360-3199 |
DOI: | 10.1016/j.ijhydene.2016.10.127 |
Popis: | Since its discovery in 1864 by Cailletet [1], hydrogen embrittlement of metals has been the target of several investigations. In 1962 Devanathan and Stachurski [2], developed an electrochemical technique for hydrogen permeation. There are now three methods to produce hydrogen: galvanostatic, potentiostatic and under open circuit potential in an acid medium (OCPAc). Regulations in Refs. [3] and [4] standardized hydrogen permeation only by the potentiostatic method. In the present work an experimental methodology for OCPAc procedure was developed. The authors conclude that the equation of diffusivity proposed by ISO 17081 and ASTM G148-97 [3] and [4] can lead to underestimated diffusivity values. The authors conclude the mathematical model proposed for the OCPAc method presented a satisfactory fit to the experimental data. Diffusivity values were calculated not only for this case but also for all other methods. However, to evaluate and explore the limits of the proposed methodology, the authors recommend its use with other metals and alloys. |
Databáze: | OpenAIRE |
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