The determination/control of hydrogen behavior in low carbon steel as a function of surface treatment
Thesis/Dissertation
·
OSTI ID:50675
Hydrogen behavior in low carbon (<0.05wt.%) steel was investigated by both experimental evaluations and by the development of a hydrogen transport model. A phenomenological model was developed to evaluate hydrogen entry and/or exit in metals exposed to an aqueous environment. The model may be used to analyze data obtained from hydrogen permeation experiments through metal membranes and allows study of both surface and bulk transport phenomena. The model can allow arbitrary chemical potentials of hydrogen on both sides of a sheet, in addition to an arbitrary initial hydrogen distribution within the metal. When compared to other popular models, the model presented fit the experimental data well and indicated that the entry, exit and metallurgy of a sheet is significant to hydrogen absorption. The model parameters may be used to characterize a given charging process. As such, multiple processes may be evaluated by using the model to calculate hydrogen distributions in a metal sheet. Permeation experiments on steel sheets showed that with decreasing pH, increasing i{sub c}, electrolyte flow, surface roughness or temperature, hydrogen absorption will increase. In addition, titanium additions to ultra low carbon (0.005wt%C) steels were found to decrease the hydrogen diffusivity and to affect the permeation behavior. Furthermore, lead contaminated steel surfaces were found to both increase or decrease the permeation current. This effect was found to be lead surface coverage and polarization control dependent. A zinc coating was found to be a barrier to hydrogen for thicknesses between 1-3.6{mu}m. A typical acidic electropickling process was found to inject twice as much hydrogen as an alkaline electrocleaning process or an acidic Zn plating process.
- Research Organization:
- Case Western Reserve Univ., Cleveland, OH (United States)
- OSTI ID:
- 50675
- Country of Publication:
- United States
- Language:
- English
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