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Steel samples exposed to a 5% sodium chloride (NaCl) solution containing 0.5% acetic acid (CH 3 COOH) saturated with hydrogen sulfide (H 2 S), with and without imidazole (C 3 H 4 N 2 ) as an inhibitor, were analyzed by x-ray photoelectron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS). The metal surface was covered initially by a layer of iron sulfide or oxide. This layer, in turn, was covered by layers in which Fe was bonded to bisulfide and C 3 H 4 N 2 groups. Corrosion protection probably resulted from the iron sulfide or oxide formed on the metal which was prevented from going into solution and recrystallization by the thin upper layer containing C 3 H 4 N 2 .KEY WORDS: films and film formation, hydrogen sulfide, imidazole, inhibitors, secondary ion mass spectrometry, steel, surface analysis, x-ray photoelectron spectroscopy FIGURE 6. Schematic structure, interface steel exposed to C 3 H 4 N 2 inhibitor. FIGURE 4. SIMS steel exposed to solution with C 3 H 4 N 2 .FIGURE 5. SIMS steel exposed to solution without C 3 H 4 N 2 .