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Passivation Characterization of Nickel‑Based Glassy Alloys in Artificial Sea Water
Hanaa AL‑Refai,Khadijah Mohammed Emran Abdalsamad 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.11
The effect of different pH values of artificial sea water on the passivation behavior and the pitting corrosion resistance ofNi70Cr21Si0.5B0.5P8C≤0.1Co≤1Fe≤1 (VZ1) and Ni72.65Cr7.3Si6.7B2.15C≤0.06Fe8.2Mo3 (VZ2) glassy alloys were studied usingimpedance spectroscopy measurements (EIS), cyclic polarization, and electrochemical frequency modulation techniques. The results showed that the alloys undergo a general corrosion process and tend to form an oxide film on the alloy surface,developing a stable protective layer in the artificial seawater solution. In both alloys, the lower corrosion current densitywas observed at a pH of 8.5 but had less pitting corrosion resistance. The VZ1 alloy had a relatively lower passive currentdensity value, having a smaller anodic hysteresis loop area compared to the VZ2 alloy. The effect of the medium’s pH oncorrosion potential, corrosion current density, pitting potential, and repassivation potential was investigated and discussed,as was surface morphology.