CrxFeCoNi合金腐蝕特性研究

Study on the Corrosion Behaviors of CrxFeCoNi Alloys

10.29987/CCUHKJE.201206.0003

林巳軒(Si-Xuan Lin)；曹春暉(Chun-Huei Tsau)

FeCoNi ； CrxFeCoNi ； 極化曲線 ； 微結構 ； FeCoNi ； CrxFeCoNi ； Polarization curve ； Microstructures

華岡工程學報

29期（2012 / 06 / 01）

12 - 17

繁體中文

本研究用CrxFeCoNi基金屬合金測量電化學性質，分別以FeCoNi、Cr0.5FeCoNi、CrFeCoNi三種金屬合金來做研究，並比較鑄造狀態及熱處理後之差異。實驗是使用市售硫酸調配成1M的硫酸溶液，並改變不同的實驗溫度，以恆電流/恆電位儀測量金屬合金在不同溫度下硫酸溶液中的極化曲線，來測定其腐蝕電位、腐蝕電流、鈍態區間電位。電化學實驗結果顯示，含Cr的合金經過熱處理後較不耐腐蝕，而不含Cr的合金熱處理後抗腐蝕會提升，隨著硫酸的溫度提高，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。

Thes study measured and compared the electrochemical properties of the CrxFeCoNi alloys, including the FeCoNi, Cr0.5FeCoNi, and CrFeCoNi alloys under as-cast and as-annealed states. The polarization curves of those CrxFeCoNi alloys were tested in the solution of 1 M H2SO4 solution, and the testing temperatures were 30˚C, 40 ˚C, 50˚C, and 60˚C. Results indicated that the alloys containing Cr would be easily corroded under as-annealed state; and as-annealed FeCoNi alloy had better corrosion resistance. Furthermore, the currents of passive regions would gradually increase when the testing temperatures increased. Increasing the testing temperature would result in decreasing the passive regions.