Abstract
The superior corrosion resistance of high-entropy alloys (HEA) has attracted much attention from researchers in recent years. In this study, with minor additions of passivation elements into a CoCrFeNi matrix, a (CoCrFeNi)94Ti1.5Al4.5 HEA coating was prepared by a plasma cladding method. This coating has a single FCC phase structure and uniform microstructure, which is expected to form a uniform and compact passive film on the corrosion surface. After adding Ti and Al elements, the passive film became more compact due to the decrease in the proportion of porous hydroxide, which increased the impedance of the passive film, thereby improving the corrosion resistance of the whole HEA coating. After potentiostatic polarization for 4 h, a stable passive film was formed on the (CoCrFeNi)94Ti1.5Al4.5 coating surface in a 0.5-M H2SO4 solution. The corrosion current density was only 175 nA/cm2, which was much lower than that of 304 stainless steel and pure titanium. This indicated that minor additions of Ti and Al can promote the formation of corrosion-resistant high-performance passive films without forming deleterious second phases, and that this phenomenon is more obvious in sulfuric acid solution than in hydrochloric acid solution.
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Acknowledgments
This work was financially supported by Natural Science Foundation of Liaoning Province (No. 2019-MS-247), Liao Ning Revitalization Talents Program (XLYC1807178), Scientific Research Funding Project of the Education Department of Liaoning Province (LJKZ0117), National Natural Science Foundation of China (No. 52001216).
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Xing, B., Ding, Q., Jin, B. et al. Corrosion Resistance and Passivation Behavior of CoCrFeNi-TiAl High-Entropy Alloy Coatings in Acidic Solutions. J Therm Spray Tech 31, 1673–1682 (2022). https://doi.org/10.1007/s11666-022-01380-6
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DOI: https://doi.org/10.1007/s11666-022-01380-6