The formation and development of corrosion products on carbon steel surface during the initial stage of atmospheric corrosion in a laboratory simulated environment have been studied by scanning electron microscopy (SEM) and Raman spectroscopy. The results showed that two different shapes of corrosion products, that is, ring and chain, were formed in the initial stage of corrosion. MnS clusters were found in the nuclei of corrosion products at the active local corrosion sites. The ringshaped products were composed of lepidocrocite (γFeOOH) and maghemite (γFe2O3) transformed from lepidocrocite. The chaintype products were goethite (αFeOOH). A formation mechanism of the corrosion products is proposed.
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