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Titanium anodic oxide films were prepared using a constant-potential method in a sodium-tartrate environmentally friendly electrolyte at different concentrations (1, 5, 15, 30 and 50 g L -1 ). The microstructure, elemental composition, and microscopic three-dimensional morphology of the film were analyzed by scanning electron microscopy, energy-dispersive spectrometry, and atomic force microscopy. The polarization curve and electrochemical impedance spectroscopy of the sample at a low potential in 3.5% NaCl solution were studied by using an electrochemical workstation. The effect of the microscopic three-dimensional morphology on the corrosion resistance was discussed. The surface morphology of the oxide film indicates that a uniform and complete oxide film with a lower roughness can be obtained in the 15 g L -1 sodium-tartrate solution concentrations. As the sodiumtartrate electrolyte concentrations increases, the depths of the cracks deepen and the size of the raised bulges increases. The resulting oxide film has a wide passivation region of 0 to 4 V, a maximum polarization resistance, a small passivation-induced current value, and a low corrosion current value of 3.730 × 10 -5 A·cm -2 , and thus, it exhibits an excellent corrosion resistance, and a wide range of potential applications, such as in biological technologies. This work provides a new approach to prepare environmentally friendly, non-polluting titanium anodic oxide films and proposes a novel design to adjust the corrosion resistance performance of the anodized film.

Effect of Microstructure on Corrosion Resistance of Anodic Oxidation Coatings on TA2 Commercially Pure Titanium in Sodium-Tartrate Solution