The composition is a significant issue for corrosion resistance of metallic materials. To reveal the correlation of corrosion behavior between multiprinciple alloys and their constituents, a series of single-phase equiatomic alloys of CoCrNi, CoCrNiFe and CoCrNiFeMn was fabricated. The electrochemical and scanning electron microscope results demonstrated that corrosion resistance of the equiatomic alloys in 0.1 M NaCl solution is located in the range but not the average value of their constituents. X-ray photoelectron spectroscopy analysis indicated that the protective performance of passive film is mainly determined by the constituent with the highest corrosion resistance and the breakdown of passive film is mainly dominated by the elements with the highest corrosion rate. Our findings can guide the materials design of multiprinciple alloys with expected corrosion performance.

组成是金属材料耐腐蚀性的重要问题。为了揭示多原理合金及其成分之间腐蚀行为的相关性，制备了一系列 CoCrNi、CoCrNiFe 和 CoCrNiFeMn 的单相等原子合金。电化学和扫描电子显微镜结果表明等原子合金在 0.1 M NaCl 溶液中的耐蚀性位于其成分的平均值范围内，而不是其平均值。X射线光电子能谱分析表明，钝化膜的保护性能主要由耐腐蚀性最高的成分决定，钝化膜的击穿主要由腐蚀速率最高的元素决定。