Accession Number : AD0715807

Title :   Fundamental Corrosion Studies: Hydrogen Embrittlement.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA SCHOOL OF CHEMICAL ENGINEERING

Personal Author(s) : Namboodhiri,T. K. G. ; Nanis,Leonard

Report Date : DEC 1970

Pagination or Media Count : 38

Abstract : The electrochemical permeation method was extended by analysis of the decay transient following steady state permeation. From the amount of extracted hydrogen compared with the amount predicted by the permeation model, it is postulated that hydrogen diffusivity in Armco iron is concentration dependent. Permeation studies of cold-rolled Armco iron indicate (a) diffusivity D(21C) decreases from, 5 x 10 to the -5th to 0.5 x 10 to the -5th sq cm/sec. in going from annealed to 2% reduced samples; (b) deformation results in increasing absorption of hydrogen from 1 x 10 to the -8th to 300 x 10 to the -8th mole H/c.c. of Fe., in going from zero to 17.6% reduction in thickness; (c) additional cold work produces little further change in hydrogen absorbed or in apparent diffusivity. (Author)

Descriptors :   (*HYDROGEN EMBRITTLEMENT, *IRON), DIFFUSION, COLD WORKING, ROLLING(METALLURGY), DEFORMATION

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE