Polarization and permeation experiments showed that a monolayer coverage of lead (Pb) effectively inhibited the hydrogen (H) evolution reaction and H penetration through type 718 (UNS N07718) alloy. Observed inhibition effects were a result of the kinetic limitations of the H discharge reaction and suppression of H absorption on the deposited monolayer. H evolution reaction and H permeation rates were reduced by ~ 67% and 70%, respectively.

Subject
Test methods, Water, Hydrogen concentration, Substrates, Metal surfaces, Hydrogen evolution, Permeation current, Permeation, Constants, Fracture, Alloys, Electrodes, Electrolytes
Keywords:
alloying, hydrogen embrittlement, hydrogen permeation, inhibition, lead, polarization, type 718 alloy
NACE International
1994
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