| Summary: | 碩士 === 中國文化大學 === 化學工程與材料工程學系奈米材料碩士班 === 107 === 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.
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