Corrosion mechanisms of steel concrete moulds in contact with a demoulding agent studied by EIS and XPS - Sorbonne Université Access content directly
Journal Articles Corrosion Science Year : 2003

Corrosion mechanisms of steel concrete moulds in contact with a demoulding agent studied by EIS and XPS

Abstract

The behaviour of E24 mild steel was studied by XPS analysis and electrochemical impedance spectroscopy (EIS) in a filtered solution of cement (pH 13), and an alkyl N-aminodiphosphonate aqueous solution called Aquadem® (7⩽pH⩽13). XPS results showed that the corrosion products developed in both media consisted of Fe2O3, covered by a very thin layer of goethite. The thickness of this oxide layer was estimated to be 3 nm. XPS analysis also demonstrated the adsorption of Aquadem® on the outer layer of FeOOH for pH lower than the zero charge pH of goethite (7.55). From XPS and EIS results, physical models of the E24 steel/electrolyte interface are proposed as a function of pH. For 11⩽pH⩽13, the steel is covered by a passive film, while for pH⩽10, pitting corrosion takes place. At pH 7, an additional mass transport phenomenon must be taken into account. The fitting procedure provided values for several physical parameters (electrolyte resistance, passive film resistance), from which the film capacitance and the dielectric constant of the oxide layer were calculated.

Dates and versions

hal-04212601 , version 1 (20-09-2023)

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Cite

A. Carnot, Isabelle Frateur, S. Zanna, Bernard Tribollet, I. Dubois-Brugger, et al.. Corrosion mechanisms of steel concrete moulds in contact with a demoulding agent studied by EIS and XPS. Corrosion Science, 2003, 45 (11), pp.2513-2524. ⟨10.1016/S0010-938X(03)00076-3⟩. ⟨hal-04212601⟩
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