Abstract The corrosion resistance and passive film properties of the CoCrNi medium-entropy alloy were investigated. Experimental results show that selective dissolution of elements in the CoCrNi is evident compared with the 304 SS. The passive film formed on the CoCrNi is enriched in Cr but depleted in Co and Ni, and the high content of Cr and thicker passive film are responsible for the higher anti-corrosion of the CoCrNi in H2SO4 solution; the surface is enriched in Co while depleted in Cr and Ni, and the higher dissolution rate of Cr is responsible for the lower anti-corrosion in NaOH solution.

中文翻译：

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CoCrNi 中熵合金与 304 不锈钢在 H2SO4 和 NaOH 溶液中的腐蚀行为比较

摘要 研究了CoCrNi中熵合金的耐蚀性和钝化膜性能。实验结果表明，与 304 SS 相比，CoCrNi 中元素的选择性溶解是明显的。CoCrNi上形成的钝化膜富Cr而贫Co和Ni，高Cr含量和较厚的钝化膜使CoCrNi在H2SO4溶液中具有较高的抗腐蚀性；表面富含 Co，而缺乏 Cr 和 Ni，Cr 较高的溶解速率导致其在 NaOH 溶液中的抗腐蚀性较低。