Passivities of Steels Weathered for Nine Years

Atmospheric corrosion of Cor-Ten steel with different surface finish: Accelerated ageing and metal release

“…A similar distribution of the corrosion products has been found in [25]. Even if the presence of Haematite in the mixture of outdoor corrosion products has been reported by several authors [11,17,27,28], it must be also taken into account that Raman analyses could induce thermal dehydration of crystalline iron oxidehydroxides, such as g-FeOOH or a-FeOOH, leading to the formation of Haematite [29]. To this regard, it is very difficult to differentiate heated Goethite from other forms of "disordered" Haematite, such as the ones derived from weathering [30].…”

Modification of Rust Layer on Carbon Steel with Reactive Actions of Metallic Cations for Improved Corrosion Protectiveness

“…In addition, interestingly, the cathodic current density is relatively larger than the oxygen diffusion-limited current density of approximately 25 μA cm -2 on polished carbon steel. 26,27) This implies that the reduction of the rust layer occurs on the as-rusted layer, contributing to the cathodic current density. To examine the effects of the cations on the reduction of rust, a specific cathodic current density, I c , was determined at 500 mV less than the open circuit potential of each specimen from the cathodic polarization curve.…”