In this work, the electrochemical potentiodynamic polarization and impedance spectroscopy analysis were used to investigate the corrosion behaviors related to microstructural evolutions of Al_0.3CoCrFeNiSi_x and Al_0.3CoCrFeNiTi_x HEAs in the NaCl solution. The results presented that addition of Si promoted the formation of BCC phase, which was regarded as a micro-anode to prevent FCC phase as a micro-cathode from being corroded. While the volume fraction of BCC phase increased to enhance the corrosion resistance of Si_x alloys with increasing Si content. Furthermore, the reduction in the grain sizes of Si_x alloys with increasing Si content could also improve corrosion resistance of the alloys. Therefore, the corrosion resistance of Si_x alloys was increased with increasing Si content. Addition of Ti with a high corrosion resistance of Clˉ caused the reduction in the grain sizes of Ti_x alloys, which can improve the corrosion resistance of alloys. However, the high Ti content can destroy the corrosion resistance of the alloys due to the formation of a large amount of precipitated phases. Therefore, as Ti with atomic percentage be equal to that of Al can effectively eliminate the negative influence of precipitated phases and microstructure on the corrosion resistance of alloys, meaning the Ti_0.3 alloy had the best corrosion resistance in Ti_x alloys. The analysis of X-ray photo-electron spectroscopy (XPS) identified that the contents of oxidized Cr³⁺ and Fe³⁺ in the passive film are the main contribution to improve the corrosion resistance of Si_x alloy. And the contents of oxidized Cr³⁺ and Ti⁴⁺ in the passive film are the main contribution to improve the corrosion resistance of Ti_x alloy.

在这项工作中，电化学动电位极化和阻抗谱分析用于研究与 Al _0.3 CoCrFeNiSi _x和 Al _0.3 CoCrFeNiTi _x HEA在 NaCl 溶液中的微观结构演变相关的腐蚀行为。结果表明，Si的加入促进了BCC相的形成，BCC相被视为微阳极，防止了作为微阴极的FCC相被腐蚀。_{而随着Si含量的增加，BCC相的体积分数增加，Si x}合金的耐腐蚀性能增强。_{此外，Si x}的晶粒尺寸减小增加Si含量的合金也可以提高合金的耐腐蚀性。_{因此，Si x}合金的耐腐蚀性能随着 Si 含量的增加而增加。添加具有高耐腐蚀性Clˉ的Ti导致Ti _x合金的晶粒尺寸减小，这可以提高合金的耐腐蚀性。然而，高Ti含量会由于大量析出相的形成而破坏合金的耐腐蚀性能。因此，由于Ti的原子百分比与Al相等，可以有效消除析出相和组织对合金耐蚀性的负面影响，即Ti _{0.3合金在Ti x}中具有最好的耐蚀性。合金。X射线光电子能谱(XPS)分析表明，钝化膜中氧化的Cr ³⁺和Fe ³⁺的含量是提高Si _x合金耐腐蚀性能的主要贡献。而钝化膜中氧化的Cr ³⁺和Ti ⁴⁺的含量是提高Ti _x合金耐腐蚀性能的主要贡献。