Abstract
Triethylstibine forms a highly corrosion-protective and persistent film on iron in acid solutions, and this film is composed of two layers; an outer layer comprised of Fe 2+ and Sb 3+ oxides and an inner one of metallic Sb. The mechanism of this film formation was investigated using polarization and impedance measurements, cyclic voltammetry, X-ray photo-electron spectroscopy and surface-enhanced Raman scattering spectroscopy on silver and iron. The results obtained indicate that triethylstibine is decomposed by the accompanying proton on the cathode to form the Sb inner layer on iron. The surface iron and a part of the deposited antimony are dissolved by way of anodic reactions forming the outer layer consisting of Fe 2+ and Sb 3+ oxides. Corrosion inhibition effects of triethylstibine for nickel and of triphenylstibine for iron were investigated. Differences in the inhibition effects among the three systems are discussed with respect to the film formation mechanism.
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