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Equivalent Hydrogen Fugacity during Electrochemical Charging of 980DP Steel Determined by Thermal Desorption Spectroscopy
Author(s) -
Liu Qinglong,
Gray Evan,
Venezuela Jeffrey,
Zhou Qingjun,
TapiaBastidas Clotario,
Zhang Mingxing,
Atrens Andrej
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700469
Subject(s) - fugacity , hydrogen , desorption , materials science , thermal desorption , electrochemistry , analytical chemistry (journal) , thermal desorption spectroscopy , trapping , spectroscopy , thermal , chemistry , thermodynamics , adsorption , electrode , environmental chemistry , ecology , physics , organic chemistry , quantum mechanics , biology
Thermal desorption spectroscopy (TDS) is used to analyze hydrogen in 980DP after (i) electrochemical charging, and (ii) gaseous charging. The hydrogen concentration increases with (i) a more negative charging potential and (ii) an increasing hydrogen gas pressure. For charging in 0.1 M NaOH, the hydrogen fugacity for 980DP is similar to that for (i) low interstitial steel, and (ii) MS1500, and is greater than that for the 3.5NiCrMoV steel. This indicates an influence of steel chemistry on the hydrogen evolution reaction. The de‐trapping activation energies are 40.5 and 50.2 kJ mol −1 , indicating hydrogen traps at boundary defects.