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PurposeTo investigate the relationship between the 3D molecular structure of two non‐planar amines (tribenzylamine – TBA, and N,N‐dibenzylaniline – DBA) and their corrosion and hydrogen permeation inhibition efficiencies for iron in H2SO4 solution.Design/methodology/approachPotentiodynamic polarization and bipolar hydrogen permeation techniques were used to evaluate the inhibition efficiencies of the investigated amines, which were selected according to their structural differences, which were limited to only one substituent. As a result, a simplified 3D model was used to correlate the molecular structures with the experimental results.FindingsBoth amines are good cathodic corrosion inhibitors; however, the DBA displays low hydrogen permeation inhibition efficiency, in contrast to the TBA. These efficiencies can be ascribed to the sole structural difference between the compounds, which determines their spatial geometry in the adsorbed states.Research limitations/implicationsIt may be difficult to find non‐planar organic inhibitors for iron in acidic solutions with the desired structural differences and a suitable solubility for further investigations.Originality/valueThe proposed approach allows a systematic analysis and an unambiguous correlation between the molecular structure and the protectiveness of prospective organic inhibitors.