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Demonstrates enhanced corrosion resistance in high-entropy alloys by adjusting pH levels.
In the investigation of the corrosion resistance of high‐entropy alloys (HEAs), particularly those composed of 3d transition metals, the passive film invariably plays a pivotal role. The barrier effect of the passive film on electron transfer and ion migration during electrode reactions governs the corrosion resistance of HEAs. In this study, the chemical composition of the passive film formed on the plasma cladded CoCrFeNi HEA was controlled by adjusting the pH of the electrolyte to optimize its properties. The results indicate that in alkaline solutions, a decrease in OH − ion concentration reduces the proportion of hydroxides within the passive film, consequently lowering the defect concentration that arising from the mismatch between oxides and hydroxides, which diminishes the number of charge carriers within the film and enhancing corrosion resistance. The passive film exhibits the excellent corrosion resistance at pH = 12, with a corrosion current density of only 1.94 nA/cm 2 . The methodology for regulating passive film properties and the established correlation between these properties and corrosion resistance, as demonstrated in this study, can be extended to future research on more complex corrosion‐resistant HEAs.
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Xing et al. (2026) studied this question.
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