首页|Corrosion behaviors related to the microstructural evolutions of as-cast Al0.3CoCrFeNi high entropy alloy with addition of Si and Ti elements

Corrosion behaviors related to the microstructural evolutions of as-cast Al0.3CoCrFeNi high entropy alloy with addition of Si and Ti elements

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  • NSTL
  • Elsevier
In this work, the electrochemical potentiodynamic polarization and impedance spectroscopy analysis were used to investigate the corrosion behaviors related to microstructural evolutions of Al0.3CoCrFeNiSix and Al0.3CoCrFeNiTix 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 Cl- 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.

High entropy alloysMicrostructureCorrosion resistanceElectrochemical potentiodynamic polarizationImpedance spectroscopyXPSDUPLEX STAINLESS-STEELMECHANICAL-PROPERTIESELECTROCHEMICAL PROPERTIESPITTING CORROSIONALRESISTANCE304-STAINLESS-STEELINHIBITIONPHASESZN

Gu, Xianyu、Zhuang, Yanxin、Huang, Dong

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Northeastern Univ

2022

10.1016/j.intermet.2022.107600

Intermetallics

Intermetallics

EISCI
ISSN：0966-9795
年,卷(期)：2022.147
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