Determination of the hydrogen fugacity during electrolytic charging of steel

Liu, Qian, Atrens, Aleks D., Shi, Zhiming, Verbeken, Kim and Atrens, Andrej (2014) Determination of the hydrogen fugacity during electrolytic charging of steel. Corrosion Science, 87 239-258. doi:10.1016/j.corsci.2014.06.033

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Author Liu, Qian
Atrens, Aleks D.
Shi, Zhiming
Verbeken, Kim
Atrens, Andrej
Title Determination of the hydrogen fugacity during electrolytic charging of steel
Journal name Corrosion Science   Check publisher's open access policy
ISSN 0010-938X
Publication date 2014-10-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.corsci.2014.06.033
Open Access Status Not yet assessed
Volume 87
Start page 239
End page 258
Total pages 20
Place of publication Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 1600 Chemistry
1500 Chemical Engineering
2500 Materials Science
Abstract A new thermal desorption spectroscopy (TDS) apparatus was used to identify the hydrogen trapping peaks, and to measure the hydrogen concentrations in 3.5NiCrMoV steel after hydrogen charging electrochemically, and in gaseous hydrogen. The hydrogen concentration increased with (i) increasingly negative charging potential and (ii) increasing hydrogen gas pressure. The equivalent hydrogen fugacity versus charging overpotential was derived. There was a difference in the diffusible hydrogen traps activated during electrochemical and gas phase charging, attributed to the difference in the hydrogen fugacity. A two-site model for Sieverts' Law explained the positive Y-intercept, as the density of already filled hydrogen traps.
Formatted abstract
This work studied the determination of the hydrogen fugacity during electrolytic charging. With a virgin surface, there were irregular permeation transients, attributed to irreproducible surface conditions. Cathodic pre-charging conditioned the entry side to a stable state. Permeability transients were used to measure the critical parameters in the thermodynamic relationship between hydrogen activity and electrochemical potential. At the same overpotential, the hydrogen fugacity in the pH 12.6 0.1 M NaOH solution was higher than that in the pH 2 0.1 M Na2SO4 solution, attributed to differences in (i) the hydrogen evolution reaction, (ii) the surface state, and (iii) the true surface area.
Keyword General Materials Science
General Chemistry
General Chemical Engineering
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 27 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 32 times in Scopus Article | Citations
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