單相CoCrFeNi高熵合金的組成元素對其在NaCl溶液中的耐蝕性能的影響

單相CoCrFeNi高熵合金的組成元素對其在NaCl溶液中的耐蝕性能的影響Effect of Constituent Elements on the Corrosion Resistance of Single-phase CoCrFeNi High-entropy Alloys in NaCl Solution in NaCl Solution

采用LSCM、EIS和動電位極化曲線等測試手段研究了Co、Fe以及Ni對CoCrFeNi單相高熵合金體系在3.5 wt %NaCl溶液中腐蝕性能的影響。結(jié)果表明，當(dāng)Co、Cr含量相同時(shí)，增加Fe含量的同時(shí)減少Ni含量，能夠降低該合金體系的維鈍電流密度；當(dāng)Fe、Cr含量相同時(shí)，增加Co含量的同時(shí)減少Ni含量，也能夠降低該合金體系的維鈍電流密度，從而提高其耐蝕性；當(dāng)Cr含量相同時(shí)，減少Co含量，同時(shí)增加Fe和Ni的含量，能夠提高合金的自腐蝕電位Ecorr，降低合金發(fā)生腐蝕的傾向。

High entropy alloys (HEAs) origin from a new alloy design concept with multi-principal elements. HEAs have attracted significant interest in the past decade. The high configurational entropy in HEAs results in simple solid solutions with structures of face-centered cubic (FCC) and body-centered cubic (BCC). Especially, the single solid solution CoCrFeNi alloy exhibits excellent properties in many aspects, such as mechanical properties, thermal stability, radiation resistance, corrosion resistance. The excellent corrosion resistance of CoCrFeNi is ascribed to the single-phase structure, uniform element distribution coupled with much higher Cr content than stainless steel. The single-phase structure and uniform element distribution can prevent the occurrence of localized corrosion and higher Cr content can protect the alloy surface better with the form of oxidation film. Besides the CoCrFeNi itself, the corrosion resistance of CoCrFeNi-based HEAs, such as CoCrFeNiAlx, CoCrFeNiCux, CoCrFeNiTix have also been extensively investigated. In most CoCrFeNi-based HEAs, the Co, Cr, Fe, Ni elements are with equal-atomic ratio. However, the equal-atomic ratio of Co, Cr, Fe, Ni elements is not necessary to obtain satisfactory properties, such as Co1.5CrFeNi1.5Ti0.5Mox, FeCoCrAlCuNix, NixCoCuFeCr2-x. Moreover, the equal-atomic ratio has been demonstrated as an unnecessary condition to ensure the single FCC structure in Co-Cr-Fe-Ni system. Accordingly, it is essential to further consider the effect of alloying elements on the corrosion resistance in Co-Cr-Fe-Ni HEA. In this investigation, the effect of Co, Fe and Ni elements on the corrosion resistance of single FCC Co-Cr-Fe-Ni system with concentrated constitution but different atomic ratios are investigated. The laser scanning confocal microscopy, electrochemical impedance spectroscopy and electrochemical polarization curves are used to characterize the corrosion and the corrosion environment is 3.5 wt % NaCl. The potentiodynamic polarization results indicate that the increase of Fe and the decrease of Ni will decrease the passivation current density of the alloys when the Co and Cr contents are equal. With the increase of Co and the decrease of Ni, the alloys show smaller passivation current density and better corrosion resistance when the Fe and Cr content are equal. With the decrease of Co and the increase of Fe and Ni, the alloys show higher corrosion potential and smaller corrosion tendency when the Cr content is constant. These results are helpful for the design of corrosion resistant HEAs in NaCl aqueous solution.

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