pH值对2024-T351铝合金在NaCl溶液中电化学行为的影响
Effect of pH on Electrochemical Behavior of 2024-T351 Aluminium Alloy in NaCl Solution
摘 要
采用动电位极化技术结合电化学阻抗谱测量, 研究了pH值对2024-T351铝合金在0.6 mol·L-1 NaCl溶液中腐蚀电化学特性的影响规律。结果表明, 在pH=5～7的NaCl溶液中, 铝合金表面可生成稳定的氧化膜, 阻抗谱出现两个容抗弧。随着溶液pH的降低, 极化曲线上的阴极电流密度逐渐增加, 且氧化膜厚度减薄, 膜电阻和电荷转移电阻均有所降低, 这表明, 氧化膜的保护性能随pH的减小而降低。在酸性(pH=3)NaCl溶液中, 阻抗谱变为一个容抗弧, 说明铝合金表面的氧化膜难以稳定存在, 基体合金直接与溶液接触, 极化曲线表现出基体合金的电化学特性。
pH值
极化曲线
电化学阻抗谱
2024-T351 aluminium alloy
pH
polarization curve
EIS
Abstract
Potentiodynamic polarization test and electrochemical impedance spectroscopy(EIS) were applied to investigate the effect of pH on the electrochemical behavior of 2024-T351 aluminium alloy in 0.6 mol·L-1 NaCl solution. The results showed that the passive film on the surface of aluminium alloy was stable in NaCl solition when pH=5~7 and the Nyquist plots were characterized by two distinct capacitance arcs. With the decrease of pH, the cathodic current density increased, the passive film became thinner, both Rox and Rct decreased. In acid (pH=3) NaCl solution, there was only one capacitance arc in Nyquist plot, indicating that the passive film was not stable with the decrease of pH. As a result, the matrix alloy was exposed to solution directly and subject to corrosion, and the polarization curves showed the electrochemical characteristics of 2024-T351 aluminium alloy.
中图分类号 TG174.3
所属栏目 试验研究
基金项目 国家自然科学基金(51131005); 中央高校基本科研业务费专项资金(FRF-BR-10-037B)
收稿日期 2012/3/14
修改稿日期
网络出版日期
作者单位点击查看
备注生海, 博士研究生,
引用该论文: SHENG Hai,DONG Chao-fang,XIAO Kui,LI Xiao-gang. Effect of pH on Electrochemical Behavior of 2024-T351 Aluminium Alloy in NaCl Solution[J]. Corrosion & Protection, 2013, 34(2): 107
共有人对该论文发表了看法，其中：
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】Immarigeon J P, Holt R T, Koul A K, et al. Lightweight materials for aircraft applications[J].Materials Characterization, 1995, 35(1):41-67.
【2】Starke E A, Staley J T. Application of modern aluminum alloys to aircraft[J].Progress in Aerospace Sciences, 1996, 32(2/3):131-172.
【3】Habazaki H, Shimizu K, Skeldon P, et al. Formation of amorphous anodic oxide films of controlled composition on aluminium alloys[J].Thin Solid Films, 1997, 30(1/2):131-137.
【4】Knight S P, Salagaras M, Trueman A R. The study of intergranular corrosion in aircraft aluminium alloys using X-ray tomography[J].Corrosion Science, 2011, 53(2):727-734.
【5】Lee H, Kim Y, Jeong Y, et al. Effects of testing variables on stress corrosion cracking susceptibility of Al 2024-T351[J].Corrosion Science, 2012, 55(1):10-19.
【6】Szklarska Smialowska Z. Pitting corrosion of aluminum[J].Corrosion Science, 1999, 41(9):1743-1767.
【7】李涛, 董超芳, 李晓刚, 等.环境因素对铝合金大气腐蚀的影响及其动态变化规律研究[J].腐蚀与防护, 2009, (4):215-219.
【8】郑弃非, 孙霜青, 温军国.铝及铝合金在我国的大气腐蚀及其影响因素分析[J].腐蚀与防护, 2009, (6):359-363.
【9】安百刚, 张学元, 宋诗哲, 等.LY12铝合金在模拟酸雨溶液中的阻抗谱研究[J].中国腐蚀与防护学报, 2003, (3):167-170.
【10】Augustin C, Andrieu E, Baret-Blanc C, et al.Empirical Propagation laws of intergranular corrosion defects affecting 2024 T351 alloy in chloride solutions[J].Journal of the Electrochemical Society, 2010, 157(12):428-436.
【11】Ambat R, Dwarakadasa E S.Studies on the influence of chloride ion and pH on the electrochemical behaviour of aluminium alloys 8090 and 2014[J].Journal of Applied Electrochemistry, 1994, 24(9):911-916.
【12】Pourbaix M.Atlas of electrochemical equilibria in aqueous solutions[C]//NACE. Houston Texas:[s.n.], 1974.
【13】Dong C F, Sheng H, An Y H, et al.Corrosion of 7A04 aluminum alloy under defected epoxy coating studied by localized electrochemical impedance spectroscopy[J].Progress in Organic Coatings, 2010, 67(3):269-273.
【14】马景灵, 文九巴, 卢现稳, 等.铝合金阳极腐蚀过程的电化学阻抗谱研究[J].腐蚀与防护, 2009, (6):373-376.
【15】Campestrini P, van Westing E P M, de Wit J H W.Influence of surface preparation on performance of chromate conversion coatings on Alclad 2024 aluminium alloy: Part II: EIS investigation[J].Electrochimica Acta, 2001, 46(17):2631-2647.
【16】Burleigh T D, Smith A T.A Simple impedance spectra method to measure the thickness of nonporous anodic oxides on aluminum[J].Journal of the Electrochemical Society, 1991, 138(8):L34-L35.
【2】Starke E A, Staley J T. Application of modern aluminum alloys to aircraft[J].Progress in Aerospace Sciences, 1996, 32(2/3):131-172.
【3】Habazaki H, Shimizu K, Skeldon P, et al. Formation of amorphous anodic oxide films of controlled composition on aluminium alloys[J].Thin Solid Films, 1997, 30(1/2):131-137.
【4】Knight S P, Salagaras M, Trueman A R. The study of intergranular corrosion in aircraft aluminium alloys using X-ray tomography[J].Corrosion Science, 2011, 53(2):727-734.
【5】Lee H, Kim Y, Jeong Y, et al. Effects of testing variables on stress corrosion cracking susceptibility of Al 2024-T351[J].Corrosion Science, 2012, 55(1):10-19.
【6】Szklarska Smialowska Z. Pitting corrosion of aluminum[J].Corrosion Science, 1999, 41(9):1743-1767.
【7】李涛, 董超芳, 李晓刚, 等.环境因素对铝合金大气腐蚀的影响及其动态变化规律研究[J].腐蚀与防护, 2009, (4):215-219.
【8】郑弃非, 孙霜青, 温军国.铝及铝合金在我国的大气腐蚀及其影响因素分析[J].腐蚀与防护, 2009, (6):359-363.
【9】安百刚, 张学元, 宋诗哲, 等.LY12铝合金在模拟酸雨溶液中的阻抗谱研究[J].中国腐蚀与防护学报, 2003, (3):167-170.
【10】Augustin C, Andrieu E, Baret-Blanc C, et al.Empirical Propagation laws of intergranular corrosion defects affecting 2024 T351 alloy in chloride solutions[J].Journal of the Electrochemical Society, 2010, 157(12):428-436.
【11】Ambat R, Dwarakadasa E S.Studies on the influence of chloride ion and pH on the electrochemical behaviour of aluminium alloys 8090 and 2014[J].Journal of Applied Electrochemistry, 1994, 24(9):911-916.
【12】Pourbaix M.Atlas of electrochemical equilibria in aqueous solutions[C]//NACE. Houston Texas:[s.n.], 1974.
【13】Dong C F, Sheng H, An Y H, et al.Corrosion of 7A04 aluminum alloy under defected epoxy coating studied by localized electrochemical impedance spectroscopy[J].Progress in Organic Coatings, 2010, 67(3):269-273.
【14】马景灵, 文九巴, 卢现稳, 等.铝合金阳极腐蚀过程的电化学阻抗谱研究[J].腐蚀与防护, 2009, (6):373-376.
【15】Campestrini P, van Westing E P M, de Wit J H W.Influence of surface preparation on performance of chromate conversion coatings on Alclad 2024 aluminium alloy: Part II: EIS investigation[J].Electrochimica Acta, 2001, 46(17):2631-2647.
【16】Burleigh T D, Smith A T.A Simple impedance spectra method to measure the thickness of nonporous anodic oxides on aluminum[J].Journal of the Electrochemical Society, 1991, 138(8):L34-L35.
相关信息
