A study of X100 pipeline steel passivation in mildly alkaline bicarbonate solutions using electrochemical impedance spectroscopy under potentiodynamic conditions and Mott–Schottky
作者： Ibrahim M. Gadala , Akram Alfantazi
DOI: 10.1016/J.APSUSC.2015.09.029
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摘要: Abstract The key steps involved in X100 pipeline steel passivation bicarbonate-based simulated soil solutions from the pre-passive to transpassive potential regions have been analyzed here using a step-wise anodizing-electrochemical impedance spectroscopy (EIS) routine. Pre-passive involve parallel dissolution–adsorption early stages followed by clear diffusion–adsorption control shortly before iron hydroxide formation. Aggressive NS4 chlorides/sulfate promote dissolution whilst inhibiting diffusion steps. Diffusive and adsorptive effects remain during formation, but withdraw thereafter its removal development of stable carbonate passive layer. Passive layer protectiveness is evaluated EIS fitting, current density analysis, correlations with semiconductive parameters, consistently revealing improved robustness colder, bicarbonate-rich, chloride/sulfate-free conditions. Ferrous oxide formation at higher potentials results markedly lower impedances disordered behavior, involvement iron(III) valence state observed Mott–Schottky tests exclusively for 75 °C
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