CoCrFeNiM"_X（x = 0.1、0.25、0.5）系列高熵合金在3.5 wt. % NaCl含氧水溶液之腐蝕行為

Corrosion Behaviors of CoCrFeNiM"_X (x = 0.1, 0.25, 0.5) High Entropy Alloys in 3.5 wt. % NaCl Aerated Aqueous Solutions Respectively

鄭子行(Zi-Xing Zheng) ； 蔡銘洪(Ming-Hong Tsai) ； 張詩戎(Shi-Rong Zhang) ； 顏秀崗(Shiow-Kang Yen)

《防蝕工程》 36卷1期 (2022/03) Pp. 1-11

https://doi.org/10.6376/JCCE.202203_36(1).0001

摘要

本研究主要探討CoCrFeNiM"_x（x=0.1, 0.25 ,0.5）高熵合金於3.5 wt. % NaCl含氧水溶液中進行動態極化測試，並透過ICP-MS及XPS分析CoCrFeNiM"_(0.25)高熵合金在經過3.5 wt. % NaCl含氧水溶液中進行動態極化測試時，在各電位下元素釋出離子的量及其鈍化膜組成，並且進一步探討其腐蝕機構，結果顯示Co(OH)_3，Fe(OH)_3和Cr(OH)_3之低溶度積k_(sp)值與穩定鈍化電流密度有緊密之關聯。研究顯示，M"元素的添加使腐蝕電位下降，因為在空氣中與低電位下，M"元素已形成穩定且緻密的氧化物與氫氧化物之鈍化膜，使鈍化電流（I_(pass)）降低，並提高的孔蝕電位（E_(pit)），有效的提升抗蝕效果。

關鍵字

高熵合金 ； 腐蝕 ； 鈍化膜 ； 動態極化 ； 感應耦合電漿體質譜法 ； 化學分析電子光譜

並列摘要

This research mainly aimed at the dynamic polarization test of CoCrFeNiM"x (x = 0.1, 0.25, 0.5) high-entropy alloy in 3.5 wt. % NaCl aerated aqueous solutions. The dynamic polarization test, the amount of elements released at each potential and the composition of the passivation film were analyzed by XPS and ICP-MS. The corrosion behaviors were also discussed. The results show that the stable passivation current density is related to the low solubility product k_(sp) value of Co(OH)_3, Fe(OH)_3, and Cr(OH)_3. The addition of M" lowers E_(corr) since the formation of stable and dense oxide and hydroxide passivation film in the air and at lower potential. The addition of M also reduces the passivation current (I_(pass)) and increases the pitting potential (E_(pit)), which improves anti-corrosion effect.

並列關鍵字

High-entropy alloys ； Corrosion ； passive film ； dynamic polarization ； ICP-MS ； XPS

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