Oxidation Kinetics in Iron and Stainless Steel: An in Situ X-ray Reflectivity Study

Abstract

The growth kinetics of passive films on iron and stainless steel (Fe−16.31%Cr) substrates in pH 8.4 borate buffer solution was investigated by using in situ specular X-ray reflectivity. The oxide growth rate decays exponentially with increasing oxide thickness consistent with the point defect model in which the electric field in the oxide is maintained constant during growth. In stainless steel, however, the electric field depends strongly on the applied potential, indicating that the oxide properties change as the applied potential varies. Using the electric field in the oxide and the observed saturation oxide thickness in a quasi steady state, we estimate the potential drop at the metal/oxide interface, in the oxide, and at the oxide/solution interface.

Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation

“…6. It displays straight lines for the various fluxes which comforts the use of the PDM as demonstrated by Kim et al 16 . We can determine that the slopes of those lines are equal to RT nF Eα − .…”

“…To evaluate E, we have used the Point Defect Model (PDM) 13,14,15,16 . The PDM has been developed for electrochemical experiments to interpret anodic oxide growths.…”

“…The iron oxidation kinetics under irradiation has been then obtained. The electric field influence in the corroded layer has been deduced using the Point Defect Model (PDM) [12][13][14][15][16] .…”

Enhancement of thermal stability of Ta∕Si(100) film by a Ta–Si interlayer

“…[7][8][9][10][11][12] In this work, we have investigated the formation of a uniform interlayer during annealing and its effect on the thermal stability of Ta/ Si͑100͒ films using in situ x-ray scattering and ex situ cross-sectional TEM. [7][8][9][10][11][12] In this work, we have investigated the formation of a uniform interlayer during annealing and its effect on the thermal stability of Ta/ Si͑100͒ films using in situ x-ray scattering and ex situ cross-sectional TEM.…”

Comparison of reversible and irreversible dipolar assemblies in a ferrofluid

“…In the first case, we gradually oxidize surfactant-stabilized iron metal particles dispersed in an organic solvent. The magnetic moments are decreased by the oxidation of iron to iron oxides [6][7][8][9][10], which have a considerably lower saturation magnetization. Since anisotropic aggregation is due to magnetic interactions, weakening the magnetic moments is expected to break up the dipolar structures.…”