Abstract

High entropy alloys (HEAs) have received tremendous attention in different applications because of their excellent corrosion resistance and superior mechanical properties. In the present work, a novel TiNbMoMnFe high entropy alloy system was synthesized and deposited on AISI 316L by DC magnetron sputtering system. The microstructure of the resulting thin film was evaluated by grazing incidence X-ray diffraction and field emission electron microscope. It was found that the thin film microstructure is composed of a crystalline solid solution (grain size of 76 nm) and an amorphous phase. The electrochemical investigations in Ringer’s solution revealed that a thin film of 670 nm thick high entropy alloy has a low corrosion current density of 0.024 μA cm⁻², approximately 30% lower than that of the uncoated 316L. Meanwhile, the HEA thin film showed the highest pitting corrosion resistance and stability of the passive film. The wettability examinations exhibited that the coated sample has a high contact angle of 90° in contrast to 60° for the uncoated ones. In summary, the TiNbMoMnFe high entropy alloy thin film shows great potential for use in biomaterial applications.

Graphic Abstract

中文翻译：

---

生物医学应用在AISI316L上沉积的TiNbMoMnFe高熵薄膜的腐蚀特性

摘要

高熵合金（HEA）由于其优异的耐腐蚀性和卓越的机械性能而在不同的应用中受到了极大的关注。在本工作中，合成了一种新型的TiNbMoMnFe高熵合金体系，并通过直流磁控溅射系统将其沉积在AISI 316L上。通过掠入射X射线衍射和场发射电子显微镜评价所得薄膜的微观结构。已经发现，薄膜的微观结构由结晶固溶体（晶粒度为76nm）和非晶相组成。在林格氏溶液中的电化学研究表明，厚度为670 nm的高熵合金薄膜的腐蚀电流密度低至0.024μAcm ^-2。，比未镀膜的316L约低30％。同时，HEA薄膜表现出最高的抗点蚀性和稳定性。润湿性检查表明，涂层样品的接触角为90°，而未涂层样品的接触角为60°。总之，TiNbMoMnFe高熵合金薄膜在生物材料应用中显示出巨大的潜力。

图形摘要