本實驗主要是在研究CrFeCoNiVx高熵合金的微結構及腐蝕性質的影響，這兩種合金的成分分別是CrFeCoNiV0.5和CrFeCoNiV1.0。實驗所採用的研究方法是以電弧熔煉法(arc-melting)將純元素熔配成塊材。再切成試片以進行微結構、電化學極化實驗及測試機械性質。本實驗使用恆電流/恆電位儀進行極化測試、電化學阻抗頻譜法(EIS)量測、定電壓量測臨界孔蝕溫度。測量此兩種合金在不同溫度下、不同濃度之氯化鈉溶液中進行測試，溶液分別為0.25M、0.5M、0.75M及1M除氧氯化鈉溶液，量測其鈍態區間電位、腐蝕電位及腐蝕電流密度，而EIS量測後進行模擬等效電路圖，將極化測試數據及Nyquist圖和試片阻抗值(Rp)做比較。論文中也會以XRD及SEM進行微結構的分析，以尋求具有機械性質及耐腐蝕性質最佳組成之合金。此外，實驗中配置的兩種合金會與市售的304不鏽鋼的測試結果做比較，結果顯示CrFeCoNiV0.5和CrFeCoNiV1.0的兩種合金在各四種溶液中的性能都會優於304不鏽鋼。
This thesis studied the microstructures and corrosion properties of CrFeCoNiV0.5 and CrFeCoNiV1.0 alloys. The experimental alloys were prepared by arc-melting, all of the specimens were cut from the as-cast alloys. The polarization behaviors, electrochemical impedance spectroscopy (EIS) and critical pitting temperatures (CPTs) of the alloys were tested in the deaerated NaCl solutions under different concertrations. The corrosion potential, corrosion current density, equivalent circuit, Nyquist and Bode plot of each alloy in the solution were done. Also the microstructures of the alloys were analyzed by SEM and XRD. The polarization results of the CrFeCoNiVx alloys had good performances by comparing with commercial 304 stainless steel under NaCl solutions.
