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Abstract
TC11 alloy is a promising structural material, and has a wide range of applications in many corrosive and high temperature hydrothermal systems. The passive film has an important influence on its electrochemical behavior. In this study, in-situ electrochemical methods (that is, open circuit potential (OCP), linear polarization (LP) and electrochemical impedance spectroscopy (EIS)) were used to monitor the long period electrochemical behavior of TC11 alloy in 0.01 M Na2SO4 solution at 300 °C/10 MPa. The growth kinetics of the passive film was mainly studied. The correlation between the evolution of the electrochemical behavior and the growth of the oxide film was discussed. The results showed that although the OCP gradually stabilized after twenty thousand seconds, henceforth the polarization resistance (Rp) was still increasing due to the thickening of the passive film. An equivalent circuit was proposed to fit the EIS experimental data, leading to determination of film capacitance and film resistance. Besides, the electrochemical data was interpreted in terms of the point defect model (PDM). The EIS results are consistent with the Rp results.
Highlights
As a promising structural material, titanium and titanium alloys are widely used in many fields [1].Titanium materials can be used in aerospace, marine, automobile industry, chemical industry and biomedical field, because of their excellent corrosion resistance and mechanical properties [2,3,4,5,6,7,8]
The long-term electrochemical measurements consisting of open circuit potential (OCP), linear polarization (LP) and electrochemical impedance spectra (EIS) were used to monitor the growth kinetics of passive film on TC11 alloy at 300 ◦ C/10 MPa Na2 SO4 solution
The conclusion is as follows: The electrochemical response of TC11 alloy changes with time, which is dominated by the growth kinetics of the surface passive film
Summary
As a promising structural material, titanium and titanium alloys are widely used in many fields [1].Titanium materials can be used in aerospace, marine, automobile industry, chemical industry and biomedical field, because of their excellent corrosion resistance and mechanical properties [2,3,4,5,6,7,8]. As a promising structural material, titanium and titanium alloys are widely used in many fields [1]. One of the reasons for the widespread application of titanium materials is the protective effect of the compact oxide film generated on their surface [9,10]. They are still unavoidably subject to corrosion under extreme conditions, such as corrosive high temperature aqueous solutions. The corrosion status of the alloy is closely related to the properties of the surface passive film. An investigation about the properties of passive film on the alloys surface can contribute to understand the corrosion behavior of these alloys [11]
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