Comparison of Corrosion Resistance of Zr-based Amorphous Alloys and Traditional Alloys in Seawater
The structure and thermal property of Zr-based amorphous alloys Zr41.2Ti13.8Cu12.5Ni10Be22.5(Vit1)and Zr55Cu30Al10Ni5(Zr55)were determined by X-ray diffraction(XRD)and differential scanning calorimetry(DSC).The electrochemical behavior of two Zr-based amorphous alloys and two tra-ditional metal alloys(304 stainless steel and 6082 Al-alloy)in 3.5％NaCl and simulated seawater solution were comparatively assessed via electrochemical workstation,scanning electron microscope(SEM)and energy dispersive spectroscope(EDS).The results show that the four metallic alloys present pitting corro-sion,but the amorphous alloys show higher corrosion resistance.Tacking the polarization curves aquired in 3.5％NaCl solution as comparison,it follows that the polarization curves of amorphous alloys and con-ventional alloys in the simulated seawater showed negative shift,which was attributed to the large amount of sulfate and chloride dissolved in the simulated seawater.Compared to the traditional metallic alloys,the passive film formed on the surface of amorphous alloys is more stable.
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