| 陈跃良,王安东,张勇,卞贵学,黄海亮.Cl-和H+对2024-T3铝合金初期腐蚀的协同效应[J].材料导报,2018,32(9):1549-1556, 1563 |
| Cl-和H+对2024-T3铝合金初期腐蚀的协同效应 |
| The Synergistic Effect of Cl- and H+ on Initial Corrosion of 2024-T3 Aluminum Alloy |
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| DOI：10.11896/j.issn.1005-023X.2018.09.021 |
| 中文关键词: Cl-和H+ 铝合金 初期腐蚀 协同效应 |
| 英文关键词: Cl- and H+, aluminum alloy, initial corrosion, synergistic effect |
| 基金项目:国家自然科学基金(51075394；51375490) |
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| 摘要点击次数: 2198 |
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| 中文摘要: |
| 利用电化学工作站、光学显微镜和扫描电镜等设备,测量并观察了2024-T3铝合金在不同Cl-和H+浓度水溶液中的极化曲线、开路电位及微观腐蚀形貌；建立了用于双因素协同效应分析的数学模型,量化了Cl-浓度和H+浓度对铝合金初期腐蚀速率的主效应、协同效应以及简单效应,探讨了二者的协同作用机制。结果表明:Cl-和H+浓度增加,铝合金腐蚀加剧,但表观腐蚀形貌未改变；置信度为0.005时,Cl-和H+浓度对腐蚀速率的主效应及协同效应显著,由主到次可排序为H+、Cl-、H+×Cl-(协同效应),二者的简单效应亦有显著性差异；二者通过改变钝化膜性质来影响铝合金初期的腐蚀行为,在不同浓度水平下,主导钝化膜破坏的反应有所不同,当H+浓度较高时,钝化膜的溶解破坏占据主导地位,当H+浓度较低时,Cl-和H+对钝化膜的协同破坏占据主导地位。 |
| 英文摘要: |
| The present work aims to explore the dual-factor synergistic effect of Cl- and H+ concentrations. We obtained the polarization curve, open circuit potential and micro morphology of 2024-T3 aluminum alloy in aqueous solution with different Cl- and H+ concentrations by means of electrochemical workstation, optical microscopy and scanning electron microscopy. A mathematical model was established for the analysis of dual-factor synergistic effect, and the main effect, synergistic effect and simple effect of Cl- and H+ concentrations on the alloy’s corrosion rate in the initial stage were quantified. We observed a corrosion acceleration but an unchanged apparent corrosion morphology while increased Cl- and H+ concentrations. It can be concluded that, the main effect and synergistic effect of Cl- and H+ concentrations on the corrosion rate are significant with the confidence level of 0.005, and the order from main to subordinate is H+, Cl- and H+×Cl-, and also there are significant differences between the simple effects of the two factors. In the initial stage, Cl- and H+ affect the corrosion behavior of aluminum alloy by changing the passive film properties. Under different concentration levels, the disintegration of the passive film is dominated by distinct reactions:the dissolution damage under high H+ concentration and the synergistic destruction of Cl- and H+ under low H+ concentration. |
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