Synchrotron x-ray and electrochemical studies of pitting corrosion of iron

作者: Weichen Xu

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摘要: Pitting corrosion of iron has been studied via artificial pits. Solid products were observed within the pit, which was characterised as disordered-carbon and Fe\(_3\)C, acted diffusion barriers for metal ions slightly increased solution resistance. Its formation depends upon interfacial potential. High purity used to calculate an effective coefficient (a combination self-diffusion electrical migration) in different MgCl\(_2\) concentrations. The contribution increases with increasing concentration if Mg\(^2\)\(^+\) depletion pit is considered. The Tafel kinetics dissolution ion saturated solutions slope (56 70 mV/decade) independent FeCl\(_2\) when saturated. effect nitrate on composition/structure salt layers characterised. layer composed FeCl\(_2\).4H\(_2\)O chloride-based (isotropic HCl anisotropic trace nitrate), Fe(NO\(_3\))\(_2\).6H\(_2\)O nitrate-based solutions. behaviour chloride/nitrate studied. Dissolution uniform under a layer, but crevice surface roughening. Potentiodynamic measurements can induce abrupt dissolution/ passivation transitions, resulting deep localised attack.

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