氯離子對Cr-Fe-Co-Ni等莫耳合金腐蝕行為研究

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题名:	氯離子對Cr-Fe-Co-Ni等莫耳合金腐蝕行為研究 The Effect of chlorine ions on the corrosion behaviors of Cr-Fe-Co-Ni Equimolar Alloys
作者:	方千豪 FANG, CHIAN-HAU
贡献者:	化學工程與材料工程學系奈米材料碩士班
关键词:	等莫耳合金電化學 electrochemical equimolar alloys
日期:	2013-06
上传时间:	2013-10-17 14:49:04 (UTC+8)
摘要:	本論文主要在研究Cr-Fe-Co-Ni四元及三元等莫耳合金之電化學性質，包括熱處理後的CrFeCoNi、FeCoNi、FeNiCr三種金屬合金來做研究。結果顯示，這些合金均以FCC結構為主要基地相，而含Cr的合金則有HCP結構之析出物。本論文以恆電流/恆電位儀測量金屬合金在1M硫酸溶液、1M氯化鈉溶液以及在1M硫酸溶液中分別添加1M、0.1M、0.01M的氯化鈉溶液中不同溫度下的極化曲線，來測定其腐蝕電位、腐蝕電流、鈍態區間電位，來相互做比較。電化學實驗結果顯示，在不同溫度之除氧1M硫酸溶液下，三種合金皆會產生鈍態膜，而隨著溫度升高，腐蝕電位Ecorr以及腐蝕電流icorr並沒有太大的變化；在不同溫度之除氧1M氯化鈉溶液下，CrFeCoNi、FeCoNi合金都不會產生鈍態膜，而FeNiCr合金卻出現類似鈍態膜之現象。隨著溫度的升高， CrFeCoNi、FeCoNi合金之腐蝕電位Ecorr會越來越低，而FeNiCr合金則會越來越高。三種合金之腐蝕電流icorr並沒有明顯穩定的趨勢。另外，在不同溫度之除氧1M硫酸溶液分別添加1M、0.1M、0.01M的氯化鈉溶液中之腐蝕電位、腐蝕電流、鈍態區間電位，則有不同的變化。 This thesis studied the electrochemical properties of the Cr-Fe-Co-Ni equimolar alloys, such as CrFeCoNi, FeCoNi, and FeNiCr alloys. The results indicated that all the matrix of these alloys were FCC structure. We also observed some HCP-structured precipitates in the matrix of the alloys contented Cr element; and these alloys had precipitation strengthening effect after annealed. In this thesis, galvanostat and potentiostat were used to measure metal alloys in 1M sulfuric acid solution, 1M sodium chloride solution, and 1M sulfuric acid solution mixed with 1M 0.1M, and 0.01M of Sodium chloride solution. Metal alloys’ polarization curves was measured under different temperatures to determine their corrosion potential, corrosion current, and passivation interval potential. The results of the electrochemical experiment shows that under different temperature of 1M of sulfuric acid (H2SO4) solution all three metal alloys will produce passive film. As the temperature increases, the corrosion current and corrosion potential did not change significantly. Furthermore, under different temperature of 1M sodium chloride (NaCl) solution, only FeNiCr produces passive like film. As the temperature increases corrosion potential of CrFeCoNi and FeCoNi alloys decreases and opposite for FeNiCr alloy. The corrosion current for all three metal alloys have no obvious sign of being stable. Also, under different temperature the corrosion potential, corrosion current, and passivation interval potential of 1M sulfuric acid (H2SO4) solution mixed with 1M, 0.1M, and 0.01M of sodium chloride (NaCl) solution has different variation.
显示于类别:	[化學工程與材料工程學系暨碩士班] 博碩士論文

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