Influence of hydrogel coatings on corrosion and fatigue of iron in simulated body fluid

Surface corrosion and fatigue studies of pure iron were performed in a modified simulated body fluid (m-SBF) electrolyte with and without applied agar films as a typical hydrogel film. The electrochemical corrosion rates were analysed using electrochemical impedance spectroscopy. The morphology and surface chemical composition of the samples after exposure were analysed using X-ray photoelectron spectroscopy and Raman microscopy. The swelling process of the agar film was measured by in situ fourier-transform infrared spectroscopy in attenuated total reflection. The combination of the electrochemical and interface analytical approaches allowed for the estimation of the influence of an applied agar film on the corrosion processes.
Overall, the studies show that the application of agar as a hydrogel film on alloy surfaces for the study of corrosion in physiological electrolytes may affect the interfacial reaction and the formation of interfacial corrosion products. This influence is based on both the macromolecular adsorption and the transfer of dissolved metal ions into the hydrogel film. The development of the surface corrosion products in turn affects the fatigue strength.
Huang J, Voigt M, Wackenrohr S, Ebbert C, Keller A, Maier HJ, Grundmeier GMaterials and Corrosion, Wiley Online Library,
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