Localized Corrosion and Corrosion Inhibitor of Al-alloy AA6061 Beneath Electrolyte Layers

doi:10.11902/1005.4537.2016.048

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (4): 366-374 DOI: 10.11902/1005.4537.2016.048

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Localized Corrosion and Corrosion Inhibitor of Al-alloy AA6061 Beneath Electrolyte Layers

Weihang ZHAO¹, Haowei WANG², Guangyi CAI¹, Zehua DONG^1,³(

)

1 Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2 China Special Vehicle Research Institute, Jingmen 448035, China
3 School of Chemical and Food Science, Hubei University of Art and Science, Xiangyang 433500, China

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Abstract

The marine atmospheric corrosion of Al-alloys could be originated from the localized corrosion beneath thin electrolyte layers. The pitting initiation of Al-alloy AA6061 beneath thin electrolyte layer of 3.5%NaCl and bulk solution, as well as the corrosion inhibition of cerium ions were comparatively investigated by means of polarization curves, electrochemical impedance, electrochemical noise and micro-morphological observation. Results demonstrate that, as a cathodic corrosion inhibitor, the density and coverage of the deposited CeO₂ film is mainly related to the thickness of thin electrolyte layer, the thinner the electrolyte layer is, the more compact the deposited CeO₂ film becomes. As a result, the oxygen reduction on the secondary intermetallic phase (Mg₂Si as cathode) of AA6061 alloy would be suppressed and therefore further refrain the initiation and development of pitting corrosion. The thinner the electrolyte layer, the higher the inhibition efficiency of cerium ions. Whereas, the inhibition efficiency of Ce³⁺ on the metastable pitting corrosion of AA6061 alloy in bulk NaCl solution decreases much more in the contrast to that beneath thin layer of NaCl solution.

Key words: aluminum alloy thin electrolyte layer bulk solution pitting corrosion inhibitor

Received: 09 April 2016

ZTFLH:

TG172.5

Fund: Supported by National Natural Science Foundation of China (51371087)

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These authors contributed equally to this work.

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Cite this article:

Weihang ZHAO, Haowei WANG, Guangyi CAI, Zehua DONG. Localized Corrosion and Corrosion Inhibitor of Al-alloy AA6061 Beneath Electrolyte Layers. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 366-374.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.048 OR https://www.jcscp.org/EN/Y2017/V37/I4/366

Fig.1 Schematic diagram of experimental setup for corrosion under thin electrolyte layer (a) and planview of the electrodes (b)

Fig.2 Polarization curves of AA6061 aluminum alloy under 3.5%NaCl thin electrolyte layer with different thicknesses (a), and limited diffusion current density as a function of thickness of thin electrolyte layer (b)

Fig.3 Cathodic polarization curves of AA6061 alloy under 3.5%NaCl electrolyte layer with 1 mmol/L Ce³⁺ (a), 2.5 mmol/L (b), 4 mmol/L (c) and variations of limited diffusion current density with thickness of thin electrolyte layer (d)

Fig.4 Anodic polarization curves of AA6061 aluminum alloy in 3.5%NaCl solution containing 1 mmol/L Ce³⁺ under static and stirred conditions

Fig.5 Nyquist plots for AA6061 aluminum alloy immersedfor 48 h in 3.5%NaCl solution containing 1 mmol/L Ce³⁺ (a) and under corresponding thin electrolyte layer (b)

Fig.6 Time dependences of impedance of AA6061 aluminum alloy immersed in 3.5%NaCl solution containing 1 mmol/L Ce³⁺ (a) and under corresponding thin electrolyte layer (b)

Fig.7 Nyquist plots of AA6061 aluminum alloy at different DC polarization potentials in static NaCl solution (a), stirred NaCl+CeCl₃ solution (b), static NaCl+CeCl₃ solution (c), and impedance vs polarization potential curves (d)

Fig.8 Potentials and current fluctuations of AA6061 aluminum alloy under thin electrolyte layer of 3.5%NaCl solution containing 1 mmol/L Ce³⁺ (a), and in corresponding bulk solution (b), under thin electrolyte layer of 3.5%NaCl soulution (c) and in corresponding bulk solution (d)

Fig.9 Comparisons of the nucleation rate (λ) and average integral charge (q_c) of metastable pits of AA6061 aluminum alloy in different conditions: (A) under thin electrolyte layer of 3.5%NaCl solution containing 1 mmol/L Ce³⁺ and (B) in corresponding bulk solution, (C) under thin electrolyte layer of 3.5%NaCl solution and (D) in corresponding bulk solution

Fig.10 Morphologies of AA6061 aluminum alloy immersed for 48 h under 100 μm 3.5%NaCl thin electrolyte layer (a) and in corresponding bulk solution (b), under thin electrolyte layer of 3.5%NaCl solution containing 1 mmol/L Ce³⁺ (c) and in corresponding bulk solution (d)

Fig.11 Schematic models for pitting corrosion and inhibition of aluminum alloy in bulk solution and under thin electrolyte layer

[1]	Liu X Y, Jiang J M, Chen Z T, et al.Research progress in anti-corrosive protection for aluminum alloy[J]. Mod. Paint. Finish., 2007, 10(12): 11(刘希燕, 蒋健明, 陈正涛等. 铝合金防腐保护研究进展[J]. 现代涂料与涂装, 2007, 10(12): 11)
[2]	Godard H P.The Corrosion of Light Metals[M]. New York: John Wiley & Sons Inc, 1967
[3]	Sherif E M, Ammar H R, Khalil K A.Effects of copper and titanium on the corrosion behavior of newly fabricated nanocrystalline aluminum in natural seawater[J]. Appl. Surf. Sci., 2014, 301: 142
[4]	Huang Y S, Shih T S, Chou J H.Electrochemical behavior of anodized AA7075-T73 alloys as affected by the matrix structure[J]. Appl. Surf. Sci., 2013, 283: 249
[5]	Su J X, Zou Y, Chen K M, et al.Corrosion mechanism and characteristic of 7075-T6 aluminum alloy panel on airline aircraft[J]. J. Mech. Eng., 2013, 49(8): 91(苏景新, 邹阳, 陈康敏等. 民航客机7075-T6铝合金壁板的腐蚀特征与机制[J]. 机械工程学报, 2013, 49(8): 91)
[6]	Han D S, Li D.Influence of marine atmosphere humidity on initial corrosion of LY 12[J]. J. Chin. Soc. Corros. Prot., 2007, 27: 134(韩德盛, 李荻. 海洋大气湿度对LY12铝合金初期腐蚀的影响[J]. 中国腐蚀与防护学报, 2007, 27: 134)
[7]	Grilli R, Baker M A, Castle J E, et al.Localized corrosion of a 2219 aluminium alloy exposed to a 3.5%NaCl solution[J]. Corros. Sci., 2010, 52: 2855
[8]	Vera R, Delgado D, Rosales B M.Effect of atmospheric pollutants on the corrosion of high power electrical conductors: Part 1. Aluminium and AA6201 alloy[J]. Corros. Sci., 2006, 48: 2882
[9]	Nguyen T H, Foley R T.The chemical nature of aluminum corrosion II. the initial dissolution step[J]. J. Electrochem. Soc., 1982, 129: 27
[10]	Fang X Z, Cao X J, Yan W, et al.Research on correlation of lab accelerated corrosion tests and marine atmospheric tests of 7A52 aluminum alloy[J]. Environ. Sci. Technol., 2015, 33: 358(方晓祖, 曹学军, 闫薇等. 7A52铝合金海洋大气环境试验与室内加速试验的相关性研究[J]. 环境工程, 2015, 33: 358)
[11]	Liu Y J, Wang Z Y, Ke W.Study on influence of native oxide and corrosion products on atmospheric corrosion of pure Al[J]. Corros. Sci., 2014, 80: 169
[12]	Elola A S, Otero T F, Porro A.Evolution of the pitting of aluminum exposed to the atmosphere[J]. Corrosion, 1992, 48: 854
[13]	Wan Y, Yan C W, Cao C N.Atmospheric corrosion of A3 steel deposited with different salts[J]. Acta Phys.-Chim. Sin., 2004, 20: 659(万晔, 严川伟, 曹楚南. 可溶盐沉积对碳钢大气腐蚀的影响[J]. 物理化学学报, 2004, 20: 659)
[14]	Zhou H R, L X G, Dong C F. Review of atmospheric corrosion behavior and mechanism of aluminum alloys and it's anodic film[J]. Equip. Environ. Eng., 2006, 3(1): 1(周和荣, 李晓刚, 董超芳. 铝合金及其氧化膜大气腐蚀行为与机理研究进展[J]. 装备环境工程, 2006, 3(1): 1)
[15]	Shao M H, Fu Y, Hu R G, et al.Localized corrosion study of 2024-T3 alloy by scanning micro reference electrode technique[J]. Acta. Phys. -Chim. Sin., 2002, 18: 350(邵敏华, 付燕, 胡融刚等. Al2024—T3合金局部腐蚀的扫描微电极研究[J]. 物理化学学报, 2002, 18: 350)
[16]	Cao C N.Principle of Electrochemistry of Corrosion [M]. 3rd Ed. Beijing: Chemical Industry Press, 2008(曹楚南. 腐蚀电化学原理 [M]. (第三版). 北京: 化学工业出版社, 2008)
[17]	Wang H L, Zheng J S.Progress of research on environmental-friendly corrosion inhibitors[J]. Corros. Sci. Prot. Technol., 2002, 14: 275(王慧龙, 郑家燊. 环境友好缓蚀剂的研究进展[J]. 腐蚀科学与防护技术, 2002, 14: 275)
[18]	Hao J L, Gao Y J, Dong Z H.Effect of siloxane sulfide and cerium salt complex conversion film on corrosion resistance of aluminum alloy[J]. J. Chin. Soc. Corros. Prot., 2015, 35: 525(郝敬丽, 高永晶, 董泽华. 硅氧烷硫化物与铈盐复合膜对铝合金耐点蚀能力的影响[J]. 中国腐蚀与防护学报, 2015, 35: 525)
[19]	Zhong X K, Zhang G A, Qiu Y B, et al.The corrosion of tin under thin electrolyte layers containing chloride[J]. Corros. Sci., 2013, 66: 14
[20]	Han W, Pan C, Wang Z Y, et al.A study on the initial corrosion behavior of carbon steel exposed to outdoor wet-dry cyclic condition[J]. Corros. Sci., 2014, 88: 89
[21]	Wang F P, Yang C W, Zhang X Y, et al.Corrosion kinetics of zinc under thin electrolyte film by means of QCM[J]. Acta Phys.-Chim. Sin., 2001, 17: 319(王凤平, 严川伟, 张学元等. 石英晶体微天平研究Zn在薄液膜下的腐蚀动力学[J]. 物理化学学报, 2001, 17: 319)
[22]	Aramaki K.Treatment of zinc surface with cerium (III) nitrate to prevent zinc corrosion in aerated 0. 5 M NaCl[J]. Corros. Sci., 2001, 43: 2201
[23]	Arenas M A, Conde A, De Damborenea J J. Cerium: A suitable green corrosion inhibitor for tinplate[J]. Corros. Sci., 2002, 44: 511
[24]	Cheng Y F, Luo J L, Wilmott M.Spectral analysis of electrochemical noise with different transient shapes[J]. Electrochim. Acta, 2000, 45: 1763
[25]	Dong Z H, Shi W, Guo X P.Initiation and repassivation of pitting corrosion of carbon steel in carbonated concrete pore solution[J]. Corros. Sci., 2011, 53: 1322

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