NiAlFe（Cr,Nb）介金屬合金之腐蝕行為研究

The Corrosion Behavior of the NiAlFe(Cr,Nb) Intermetallic Alloys

王鴻彬(Hong-Bin Wang) ； 邱亮維(Liang-Wei Chiou) ； 曹春暉(Chun-Huei Tsau)

《華岡工程學報》 28期 (2011/06) Pp. 80-85

https://doi.org/10.29987/CCUHKJE.201106.0012

摘要

本論文是在研究NiAlFe基介金屬合金的電化學性質，分別是以Ni47.5Al25Fe27.5、（Ni47.5Al25Fe27.5）99Cr1、（Ni47.5Al25Fe27.5）99Nb1三種介金屬合金來做研究，實驗是使用市售硫酸調配成0.25M、0.5M、0.75M及1M的硫酸溶液，並改變不同實驗溫度，以恆電流/恆電位儀測量比三種介金屬合金在不同溫度下的硫酸溶液中的極化曲線，來測定其腐蝕電位、臨界電流、腐蝕速率。電化學實驗結果顯示，三種介金屬合金置於不同溫度下硫酸溶液中，腐蝕電流及腐蝕電位雖沒有明顯變化，但隨著硫酸的溫度以及濃度的提高，鈍態區電流會向高電流方向偏移，而鈍態膜現象也會隨之減少。觀察腐蝕後的金相，可以得知硫酸溶液腐蝕合金的樹枝間相。

關鍵字

NiAlFe合金 ； 極化曲線

並列摘要

The electrochemical properties of the NiAl Fe based intermetallic alloys, including the Ni47.5Al25Fe27.5, (Ni47.5Al25Fe27.5)99Cr1 and (Ni47.5Al25Fe27.5)99Nb1 alloys, were studied in this thesis. The 0.25 M, 0.5M, 0.75M and 1M H2S04 solutions at different temperature were also selected to test the corrosion behaviors of these alloys. The polarization curves of three alloys under different conditions were all identified for comparing their corrosion potentials, corrosion currents and corrosion rates. The results indicated that the corrosion potentials and currents of these three alloys did not change significantly in the H2SO4 solution with different temperatures; but the currents of passive regions would gradually increase when the temperatures and concentrations of H2SO4 solutions increased. The FCC interdendrites in these three alloys were the anode and would be etched during electrochemical tests in the H2SO4 solutions.

並列關鍵字

NiAlFe alloy ； Polarization curve