Abstract: The oxides of iron immersed in hydrochloric acid and the antioxidation of the inhibitor have been studied by the Conversion Electron Mössbauer Spectroscopy (OEMS). The oxides of iron immersed in hydrochloric acid are β-FeOOH and γ-FeOOH, the latter being the dominant composition. The inhibitor in hydrochloric acid slows down the oxidation progress of iron immersed in hydrochloric acid. Furthermore, the better the inhibition ability of the inhibitor for iron in bydrochloric acid, the slower the oxidation progress of iron in the air. At the end of this paper, the anti-oxidation mechanism of the inhibitor is discussed.

Key words: iron, oxidation, corrosion inhibitor, hydrochloric acid, Mössbauer spectroscopy