Preparation and Corrosion Resistance of TiO2 Two-dimensional Thin Films on Magnesium Alloy Surface
As magnesium is a relatively reactive metal,it is easy to be oxidized,and the generated oxide film is not protective,which further leads to a higher corrosion rate of magnesium easily.By preparing a protective film on the surface of magnesium alloy to hinder contact with corrosive media,the contact with corrosive substances can be blocked,thus the corrosion resistance of magnesium alloy can be en-hanced.Firstly,TiO2 colloid was prepared according to the existing literature,and then TiO2 thin film was prepared on the surface of magnesium alloy base sample using electrophoretic deposition method with the above mentioned TiO2 colloid as the anode,and the effect of each experimental parameter (dif-ferent electrophoretic time and different deposition time)on the sample in the preparation step was in-vestigated.The prepared TiO2 films were analyzed by XRD,SEM and other testing methods,and the po-larization curves of the samples were further tested and analyzed.Through a series of parameter optimi-zation,it is found that the optimal parameters are electrophoresis voltage of 20 V and deposition time of 90 s.In this case,the TiO2 film prepared has the most positive corrosion potential,which is -1.26 V, and the lowest corrosion current density is 4.21×10-6 A/cm2 .
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