Accession Number : AD0696992

Title :   ELECTROCHEMICAL ASPECTS OF HYDROGEN PERMEATION IN IRON AT HIGH HYDROSTATIC PRESSURE.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA SCHOOL OF CHEMICAL ENGINEERING

Personal Author(s) : DeLuccia,John J. ; Yamakawa,Koji ; Nanis,Leonard

Report Date : OCT 1969

Pagination or Media Count : 18

Abstract : A high pressure system containing an electrochemical method for continuous hydrogen permeation determination through metal foil is described for use at hydrostatic pressures up to 20,000 psi. The diffusion coefficient of hydrogen in Armco iron at 21C is 0.000043 sq cm/sec, unaffected by pressure up to 6200 psi; the solubility of hydrogen in Armco iron is a linear function of pressure up to a value of 7.8 x 10 to the minus 7th power mol H2/cc Fe at 6200 psi, 21C, and does not follow Sieverts' law behavior. By linking the hydrogen permeation current caused by cathodic charging with that caused by applied pressure, an overpotential-pressure relationship is obtained. (Author)

Descriptors :   (*IRON, *HYDROGEN EMBRITTLEMENT), (*HYDROGEN, PERMEABILITY), FOILS(MATERIALS), HYDROSTATIC PRESSURE, ELECTROCHEMISTRY, DIFFUSION, SOLUBILITY

Subject Categories : Physical Chemistry
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE