Abstract
The anodization of the Ti‐Cu (2%) alloy was carried out in a 5M H3PO4 solution for 2 minutes. The obtained layers are characterized by XPS, X‐ray diffraction, and Raman spectroscopy. The results showed that the obtained films are composed of poorly crystallized TiO2 oxide. Electrochemical Impedance spectroscopy studies revealed that the thickness of the formed film increases with increasing anodization potential. Additionally, the resistance of charge transfer becomes higher when the anodization potential increases. Thus, the Mott Schottky model revealed that the formed film is an n‐type semiconductor. The density of charge carriers is in good agreement with those found in the literature. Also, it is found that the flat‐band potential increases with increasing treatment potential.
Highlights
Titanium and its alloy are highly solicited in many fields of use, especially in the area of medical implants [1,2,3,4]
We start from a red-violet color at 20 V that becomes dark blue at 25 V turns to a pale blue color at 35 V. e titanium alloy is coated with a colored layer after anodization. is allows broad use in the field of medical implants, given that we can know its location depending on the color of the implant [26]
Ese observations are in good agreement with phosphoric acid or other acidic media results reported in the literature [27, 28]
Summary
Titanium and its alloy are highly solicited in many fields of use, especially in the area of medical implants [1,2,3,4]. Is resistance against corrosion of titanium and its alloys is due to the formation of an oxide protective film. It is reported in the literature that the titanium oxide films exhibit either p- or n-type conductivity depending on their stoichiometry and the nature of the resulting defects [10, 11]. It was found that, in most acidic media, titanium oxide exhibits high resistance to corrosion, and almost no anodic activity is observed in a wide range of applied voltage. It can act as catalytic support for the reduction reaction with a preferential affinity to the reduction of oxygen [13, 14]. Titanium oxide was investigated for its electrochromic properties [15] and is widely used in photovoltaic cells [15,16,17,18] and sensors [19,20,21]
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