Quantitative evaluation of hydrogen absorption by detecting non-absorbed hydrogen in electrochemical hydrogen permeation test

In order to accurately determine the mass balance of hydrogen in steel sheet in electrochemical hydrogen permeation tests, channel flow double electrode (CFDE) technique was combined with the Devanathan-Stachurski (DS) cell. One side of a steel sheet was used as the hydrogen entry electrode in the DS cell and as the generator electrode in the CFDE. The back side of the steel sheet was anodically polarized in NaOH solution for hydrogen withdrawal, and anodic polarization of the platinum detector electrode for CFDE was performed for molecular hydrogen that did not enter the steel sheet while cathodic polarization of the hydrogen entry electrode in Na2SO4 solution. The mass balance obtained from the mass of adsorbed hydrogen, the mass of permeated hydrogen, and the mass of evolved hydrogen enabled quantitative analysis of the hydrogen un-permeated in the steel sheet.