Formation of Rust During the Corrosion of Steel in Water and (NH4)2S04 Solutions

Formation of rust during the corrosion of steel in water and (NH4)2S04 solutions was monitored at 20 °C up to 3 months and at 90 °C up to 3 days. All corrosion products were ana1yzed by X-ray diffraction and Fourier transform IR spectrosropy. Four oxide phases, lepidocrocite (γ-FeOOH}, goethite (α-FeOOH), magnetite (Fe204) and hematite (α-Fe203), were found in the corrosion products. Their distribution or absence of some oxide phases in corrosion products were strongly dependent on the experimental conditions