AZ91D镁合金和2002铝合金在0.5 mg/L NaCl溶液中的电偶腐蚀行为研究
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刘泽琪, 何潇潇, 祁康, 黄华良
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Galvanic Corrosion Behavior for Galvanic Couple of AZ91D Mg-alloy/2002 Al-alloy in 0.5 mg/L NaCl Solution
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LIU Zeqi, HE Xiaoxiao, QI Kang, HUANG Hualiang
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表3 耦合条件下AZ91D镁合金和2002铝合金在30 ℃,0.5 mg/L NaCl溶液中不同浸泡时间的EIS拟合结果
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Table 3 EIS fitting paramaters of AZ91D Mg-alloy and 2002 Al-alloy with different immersion time under coupling condition in 0.5 mg/L NaCl solution at 30 ℃
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| Material | t / h | Rs Ω·cm2 | Cf1 F·cm-2 | Rf1 Ω·cm2 | CPEf2 S·snf1·cm-2 | nf2 | Rf2 Ω·cm2 | CPEdl S·snf2·cm-2 | ndl | Rct Ω·cm2 | Rp Ω·cm2 |
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| AZ91D Mg-alloy | 24 | 94.86 | --- | --- | 6.59×10-8 | 0.97 | 12928 | 1.40×10-5 | 0.75 | 10431 | 23359 | | 48 | 84.75 | --- | --- | 9.05×10-9 | 0.95 | 10524 | 2.79×10-5 | 0.86 | 21519 | 32103 | | 72 | 59.82 | --- | --- | 2.54×10-8 | 0.96 | 6316 | 1.20×10-5 | 0.89 | 13764 | 20080 | | 96 | 49.66 | --- | --- | 1.23×10-8 | 0.97 | 2449 | 5.09×10-4 | 0.75 | 14814 | 17263 | | 2002 Al-alloy | 24 | 24.56 | 1.10×10-8 | 1717 | 4.48×10-5 | 0.89 | 3313 | 3.87×10-4 | 0.78 | 24970 | 30000 | | 48 | 88.15 | 1.33×10-8 | 3108 | 6.49×10-5 | 0.87 | 15252 | 2.13×10-4 | 0.77 | 76664 | 95024 | | 72 | 36.06 | 1.21×10-8 | 3106 | 6.11×10-5 | 0.89 | 14611 | 2.63×10-4 | 0.87 | 18093 | 35810 | | 96 | 62.88 | 1.41×10-8 | 2954 | 1.73×10-5 | 0.90 | 14288 | 4.08×10-3 | 0.94 | 8563 | 25805 |
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