Effect of Ti Element on Electrochemical Corrosion Behavior of Industrial Zr-Ti Alloy
In this study,the electrochemical corrosion behavior of industrial Zr-xTi(x=0,5,10,15)alloy plate in 6 mol/L sub-boiling concentrated nitric acid environment was studied by potentiostatic polarization curve method.The corrosion properties of Zr-Ti alloys with different Ti contents were evaluated by testing electrochemical parameters such as potentiodynamic polarization curve and electrochemical impedance spectroscopy,and the corrosion morphology of the materials was characterized via scanning electron microscope(SEM)and 3D ultra-depth microscope.The experimental results show that adding Ti element can reduce the self-corrosion current density Icorr of alloy materials and increase the charge transfer resistance Rct on the surface of alloy materials,which is beneficial to the corrosion resistance of materials.When the Ti content is 5％,there is an obvious passivation interval.The alloy material has the smallest self-corrosion current density Icorr,which is about 4.092 3×10-6 A/cm2,and the largest charge transfer resistance Rct,which is about 16 514 Ω·cm2.The oxide film on the alloy surface is smooth and flat,and the corrosion degree is the weakest,indicating that the corrosion rate of Zr-5Ti alloy material is low and it has excellent nitric acid corrosion resistance.
spent fuel reprocessingzirconium alloyconcentrated nitric acidelectro chemical corrosioncorrosion morphology
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