Hydrogen Emanation and Distribution in Metals and Alloys
| Autor: | S. M. Toy, A. Phillips |
|---|---|
| Rok vydání: | 1970 |
| Předmět: |
Materials science
Hydrogen Hydride General Chemical Engineering Metallurgy Analytical chemistry chemistry.chemical_element General Chemistry Metallic hydrogen engineering.material Chemical reaction Neodymium Metal chemistry visual_art visual_art.visual_art_medium engineering General Materials Science Maraging steel Hydrogen embrittlement |
| Zdroj: | CORROSION. 26:300-307 |
| ISSN: | 1938-159X 0010-9312 |
| DOI: | 10.5006/0010-9312-26.7.300 |
| Popis: | Hydrogen emanation and distribution (at microstructural features) down to one micron size have been observed in 250-grade 18 Ni maraging steel weldments and in titanium-6Al-4V. A neodymium (Nd) hydrogen metal detector system was used to locate and estimate the amount of hydrogen emanation; this system operates on the basis of a chemical reaction. Neodymium, or a similar rare earth metal, is reacted with the emanating hydrogen at a temperature of 29 C or higher to form a metal hydride. A thin neodymium film is evaporated on the polished and etched metal or alloy surface to be examined. This metal film is optically transparent except at the H2 reaction sites where NdH2 is formed; therefore, the microstructural features of the metal surfaces are directly correlated to the H2 emitting sites. The NdH2 reaction nodules appear black when observed with an optical microscope. By measuring the size of the reaction sites and the thickness of the film, the amount of hydrogen reacted with the Nd to form NdH2 ... |
| Databáze: | OpenAIRE |
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