Corrosion of nanocrystalline and coarse-grained nickel-iron (Ni-Fe) alloys in neutral and alkaline sulfate environments
Source abstract
Abstract
Abstract Potentiodynamic polarization behaviour of electrodeposited nanocrystalline and conventional polycrystalline Ni-Fe alloys of similar compositions was investigated in neutral (pH 7) and alkaline (pH 10) 0.5 M Na2SO4 environments. In neutral solution, elevated current densities and delayed passivation were observed for all nanocrystalline materials, independent of composition. This behaviour was attributed to sulfur, present in the nanocrystalline materials as an impurity, more so than an effect of grain refinement. In alkaline solution, the effect of sulfur was exceeded by oxide film formation, and no significant difference in corrosion behaviour was observed as a function of grain size i.e. intercrystalline volume fraction.
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Research context
OpenAlex topics: Electrodeposition and Electroless Coatings · Corrosion Behavior and Inhibition · Electrochemical Analysis and Applications
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References (77)
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