Abstract
The corrosion behaviors of TA2 titanium were investigated by in situ electrochemical measurements in a solution of 2.3 ppm Li+ and 1500 ppm B3+ at a temperature of up to 300 °C. The morphology, phase structure, and composition of the oxide film, after 800 h exposure time in a solution at 300 °C and 14 MPa, were characterized by scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), etc. The growth mechanism of the oxide film based on the activation energy was discussed. The potentiodynamic polarization and electrochemical impedance spectroscopy analyses showed that the corrosion resistance of titanium significantly weakened when increasing the solution temperature from 30 to 300 °C, but it increased in the initial stage of holding time (0–66 h) at 300 °C, then gradually decreased (66–378 h), and reached a stable state after 378 h. The oxide film, which was about 5 μm thick, consisted of anatase phase and a small amount of B2O3. The growth mechanism is a combination of layer by layer and island growth.
Highlights
Coatings 2021, 11, 659. https://The corrosion behaviors of materials under high-temperature and -pressure water environments have attracted much attention in the nuclear power or petrochemical industry.At present, stainless steel, nickel alloy, zirconium alloy, and others have been applied in challenging environments for their excellent properties [1,2,3,4]
Some papers have been published about the corrosion properties of titanium alloy in high-temperature and high-pressure aqueous solution environments, such as sulfuric acid solution with Cl−, supercritical water, or alkaline solution, by gravimetric or electrochemical tests [10,11,12,13]
The corrosion4.resistance of TA2 titanium in a high-temperature lithium borate soluAccording to the potentiodynamic polarization curves and Nyquist plots against tion is related to the growth of oxide film
Summary
Coatings 2021, 11, 659. https://The corrosion behaviors of materials under high-temperature and -pressure water environments have attracted much attention in the nuclear power or petrochemical industry.At present, stainless steel, nickel alloy, zirconium alloy, and others have been applied in challenging environments for their excellent properties [1,2,3,4]. The corrosion behaviors of materials under high-temperature and -pressure water environments have attracted much attention in the nuclear power or petrochemical industry. Titanium and its alloys have low density, high specific strength, and good crack resistance, which have been widely applied [7,8,9]. They have excellent corrosion resistance at ambient temperatures in sodium chloride or other mediums due to their good passivating and repassivating ability. Some papers have been published about the corrosion properties of titanium alloy in high-temperature and high-pressure aqueous solution environments, such as sulfuric acid solution with Cl− , supercritical water, or alkaline solution, by gravimetric or electrochemical tests [10,11,12,13]. Titanium and its alloys show potential for the nuclear power industry
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