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首页> 外文期刊>International Journal of Electrochemical Science >Microstructure and Corrosion Properties of Ti-6Al-4V alloy by Ultrasonic Shot Peening
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Microstructure and Corrosion Properties of Ti-6Al-4V alloy by Ultrasonic Shot Peening

机译：超声喷丸强化Ti-6Al-4V合金的组织和腐蚀性能

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摘要

A nanostructured surface layer of Ti-6Al-4V alloy was obtained through ultrasonic shot peening(USSP). The microstructure and microhardness were studied using an optical microscope and ananoindentation tester. The corrosion performance of the Ti-6Al-4V alloy was investigated usingpotentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The composition ofthe passive film formed on the surface was analyzed using X-ray photoelectron spectroscopy (XPS).The results show that the grain size of the surface layer is on nanometer scale and increases graduallyfrom the surface to the matrix after USSP treatment. The surface microhardness reaches up toapproximately 7 GPa, which is significantly higher than that of the matrix. The self-corrosion potentialof the USSP samples increases compared with that of the untreated sample, and the corrosion currentdensity decreases by two orders of magnitude, the capacitive resistance is much larger. A compact andstable passive film forms on the surface after USSP treatment. High-density nanograin boundaries and4+ dislocations generated from surface nanocrystallization provide more channels for Ti to form passiveoxide films.
机译：通过超声喷丸（USSP）获得了Ti-6Al-4V合金的纳米结构表面层。使用光学显微镜和阳极压痕测试仪研究了显微组织和显微硬度。使用电位动力学极化和电化学阻抗谱（EIS）研究了Ti-6Al-4V合金的腐蚀性能。用X射线光电子能谱（XPS）分析了表面形成的钝化膜的组成，结果表明，USSP处理后，表面层的晶粒尺寸为纳米级，并从表面到基体逐渐增大。表面显微硬度高达约7 GPa，明显高于基体的显微硬度。与未经处理的样品相比，USSP样品的自腐蚀电位增加，腐蚀电流密度降低两个数量级，电容电阻更大。经过USSP处理后，表面会形成致密而稳定的无源膜。表面纳米结晶产生的高密度纳米晶界和4+位错为Ti形成钝化氧化膜提供了更多的通道。

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