Effect of benzotriazole on the hydrogen absorption by iron

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1837552· OSTI ID:509368

Abd Elhamid, M H; Pickering, H W ^[1]; Ateya, B G ^[2]

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1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
2. Cairo Univ. (Egypt)

The results presented show that benzotriazole (BTA) inhibits the absorption of hydrogen into iron which is cathodically polarized in an acid (pH {approx_equal} 1.7) sulfate solution. Analysis of the results indicates that BTA inhibits also the hydrogen evolution reaction, although it does not change its mechanism, which is shown to be proton discharge-Tafel recombination. However, BTA shifts the position of the equilibrium, H{sub ads} {r_equilibrium} H{sub abs}, toward the left side and hence leads to a decrease in the concentration of H{sub abs} within the lattice. The extent of this decrease depends on the BTA concentration, e.g., about fivefold at 1 mM and tenfold at 10 mM BTA. This effect is opposite to that reported for inhibitors such as thiourea which inhibits the hydrogen evolution reaction and yet promotes hydrogen permeation.

• Sponsoring Organization: Office of Naval Research, Washington, DC (United States)
• OSTI ID: 509368
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 144; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BENZOTHIAZOLES
CATALYTIC EFFECTS
CONCENTRATION RATIO
CORROSION INHIBITORS
EXPERIMENTAL DATA
HYDROGEN
HYDROGEN EMBRITTLEMENT
IRON
PERMEABILITY