Effect of Electrodeposited Metals on the Permeation of Hydrogen through Iron Membranes.
Technical progress rept.,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE
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The permeability of electrolytically charged hydrogen through annealed Ferrovac E iron memebranes was found to decrease significantly upon coating the charging surface of iron with thin layers of either Pt, Cu or Ni Watts or electroless. The absorption of hydrogen was delayed for a period which depends on the nature and the thickenss of the metallic coating. The results show that such coatings do not have to be thick or even continuous to be effective, in which case a catalytic mechanism is proposed to explain the marked reduction in hydrogen permeation through the iron. Experimental confirmation is presented of this catalytic mechanism and of the barrier mechanism which is operative in the presence of a thick continuous coating. It is also shown that the domains of each mechanism can be determined by simple calculations from first principles. Author
- Properties of Metals and Alloys