초록
In this study, hydrogen permeation currents were investigated in hydrogen permeation tests for NaCl solutions at different concentrations to clarify the effect of chloride ion on hydrogen entry into the steel sheet. Hydrogen permeation currents for bromide and iodide ions were also investigated in the same test to determine the effect of halide ion species on hydrogen entry. The amount of hydrogen entry increased with increasing chloride ion concentration in hydrogen permeation tests due to an increase in the amount of chloride ions adsorbed on the steel sheet surface, which prevented hydrogen atoms from bonding with each other. It was also found that hydrogen entry was higher in bromide and iodide ion environments than in the chloride ion environment. According to the HSAB rule, bromide and iodide ions are considered to have stronger adsorption with the steel sheet surface than chloride ions, preventing bonding between hydrogen atoms more than chloride ions.