Study on Passivation Behavior of Fe-based Amorphous Nanocrystalline Coatings under Flow Conditions
Through monitoring the density of initial corrosion current,analyzing electrochemical impedance spectrum,polarization curve and micro-morphology,both corrosion tendency and pitting behavior of Fe-based amorphous nanocrystalline coatings at different flow rates were studied to show that,the self-corro-sion tendency of Fe-based amorphous nanocrystal coatings increases under flow conditions.With the in-crease of the flow rate,the passivation current density increases first and then decreases and reaches 3.09×10-4 A/cm2,a maximum value when the flow rate stays at 5 L/min.The pitting potential decreases first and then increases and the hysteresis ring area increases first and then decreases and the maximum depth of pitting pit reaches 50.61 μm.This means that the pitting ability of the coating decreases at high flow rate.
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