| 摘要: | 本實驗主要研究高熵合金FeCoCrNiMox(x=0,0.3,0.7,1)的電化學特性與腐蝕行為，其成分與一般商業用316不鏽鋼相近，除了Mo之外，Fe、Co、Cr、Ni均為1mole，而Cr的添加有助於鈍態膜的形成，Mo之添加則有助於抗氯鹽之孔蝕。由XRD結果顯示，當-Mo含量0和0.3時為單一FCC相，Mo含量≧0.7時，則有HCP相逐漸出現。隨著Mo含量增加而逐漸上升。
實驗中使用恆電位儀測量四種合金，在1M硫酸以及0.01M、0.1M、1M、5M氯化鈉溶液中進行陽極極化曲線測試，測試不同溫度之腐蝕電流密度(icorr)、腐蝕電位(Ecorr)、鈍態電流密度(ipass)、崩潰電位(Eb)等相關參數。並使用阻抗頻譜法檢測合金在酸性及氯鹽環境下的各項數據，可以獲得Nyquist圖及Bode圖，並模擬其電路圖。使用微硬度試驗機檢測不同成分合金的硬度，使用SEM觀察合金在王水腐蝕後以及陽極極化後的表面狀況，成分分析則使用EPMA獲得合金上元素的強度及分布情形。
This experiment mainly studies the electrochemical properties and corrosion behavior of the high-entropy alloy FeCoCrNiMox(x=0,0.3,0.7,1). Its composition is similar to that of general commercial 316 stainless steel. In addition to molybdenum, all of the elements, iron, cobalt, chromite, nickel are of 1 mole. Iron is the main component, and the addition of chromium contributes to the formation of a passive film. The addition of molybdenum contributes to the pitting corrosion of chloride salts. The X-ray diffraction results show that when the molybdenum content is 0 and 0.3, it is a single FCC phase, and when the molybdenum content is ≧0.7, the HCP phase gradually appears. As the molybdenum content increases, it gradually rises.
The anodic polarization curves of those HEAs were conducted in the solution of varying concentration H2SO4 and NaCl. Electrochemical parameter, such as corrosion potential, corrosion current density and passive current density were all tested and measured through potential dynamic polarizations. Use the Electrochemical Impedance Spectroscopy(EIS) to detect various data of HEAs in acidic and chloride environments, Nyquist and Bode plots can be obtained. and its circuit diagram can be simulated. Both SEM and EMPA were employed for the corroded surface analysis both quantitatively and qualitatively. |
