Influence of Concentrations of KOH and Na2SiO3 Electrolytes on the Electrochemical Behavior of Ceramic Coatings on 6061 Al Alloy Processed by Plasma Electrolytic Oxidation

doi:10.1007/s40195-016-0384-3

Abstract

Abstract:

In this study, ceramic coatings were deposited on 6061 Al alloy using a plasma electrolytic oxidation (PEO) technique, and the effect of concentrations of KOH and Na₂SiO₃ as electrolytes for PEO process was studied on microstructure, chemical composition, and electrochemical behavior of PEO coatings formed on the 6061 Al alloy. The results indicated that the increase in concentration of KOH led to rise in electrical conductivity of electrolyte. Consequently, the breakdown voltage reduced, which in turn improved the surface quality and the corrosion behavior. Moreover, the increase in concentration of Na₂SiO₃ resulted in the increase in incorporation of Si in the coating, which led to a higher corrosion potential in the concentration of 4 g L^-1. According to this investigation, the best protection behavior of coatings can be obtained when the KOH and Na₂SiO₃ concentrations in PEO electrolyte are equal to 4 g L^-1.

Key words: Al alloy, Plasma electrolytic oxidation (PEO), Potentiodynamic polarization, Electrochemical impedance spectroscopy (EIS)

Arash Fattah-Alhosseini, Mojtaba Vakili-Azghandi, Mohsen K. Keshavarz. Influence of Concentrations of KOH and Na₂SiO₃ Electrolytes on the Electrochemical Behavior of Ceramic Coatings on 6061 Al Alloy Processed by Plasma Electrolytic Oxidation[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(3): 274-281.

Figures/Tables 10

Table 1 Different chemistry conditions of electrolytes used for PEO coating process of 6061 Al alloy samples

Samples	S1	S2	S3	S4	S5
KOH (g L^-1)	2	3	4	4	4
Na₂SiO₃ (g L^-1)	2	2	2	3	4

Fig. 1 Time versus voltage curves of PEO-treated 6061 Al alloy samples at different concentrations of KOH and Na2SiO3

Fig. 2 Potentiodynamic polarization curves of PEO-coated 6061 Al alloy in different concentrations of KOH and Na2SiO3

Fig. 3 Variations in the corrosion current density a, passive corrosion density b, and corrosion potential c of 6061 Al alloy with and without PEO coatings

Fig. 4 Bode a and Bode-phase b plots of PEO-coated 6061 Al alloy in different concentrations of KOH and Na2SiO3

Fig. 5 Equivalent electrical circuits used to fit the impedance data of 6061 Al alloy with and without PEO coatings

Fig. 6 Variations in the corrosion resistance of functional layer a, corrosion resistance of barrier b, capacitance of functional layer c, and capacitance of barrier layer d of 6061 Al alloy with and without PEO coatings

Fig. 7 SEM micrographs of cross sections and surfaces of coatings of samples S1, S2, S3, S4, and S5, respectively

Fig. 8 XRD patterns of 6061 Al alloy, sample S3, and sample S5

Fig. 9 SEM micrographs of surfaces of 6061 Al alloy a, and sample S5 b after 600-h immersion in 3.5 wt% NaCl solution

References 38

[1]	C. Vargel, Corrosion of aluminium (Elsevier, Amsterdam, 2004)
[2]	X.H. Wu, P.B. Su, Z.H. Jiang, S. Meng, ACS Appl. Mater. Interfaces 2, 808 (2010)
[3]	W. Miller, L. Zhuang, J. Bottema, A.J. Wittebrood, P. De Smet, A. Haszler, A. Vieregge, Mater. Sci. Eng. A 280, 37 (2000)
[4]	V. Dehnavi, B.L. Luan, D.W. Shoesmith, X.Y. Liu, S. Rohani, Surf. Coat. Technol. 226, 100(2013)
[5]	V. Raj, M.M. Ali, J. Mater. Process. Technol. 209, 5341(2009)
[6]	H. Dong, Surface engineering of light alloys (Woodhead Publishing Limited, Oxford, 2010)
[7]	M.M.S.A. Bosta, K.J. Ma, H.H. Chien, Infrared Phys. Technol. 60, 323(2013)
[8]	Y.M. Wang, H. Tian, X.E. Shen, L. Wen, J.H. Ouyang, Y. Zhou, D.C. Jia, L.X. Guo, Ceram. Int. 39, 2869(2013)
[9]	K. Wang, B.H. Koo, C.G. Lee, Y.J. Kim, S. Lee, E. Byon, Chin. J. Aeronaut. 22, 564(2009)
[10]	P. Gupta, G. Tenhundfeld, E.O. Daigle, D. Ryabkov, Surf. Coat. Technol. 201, 8746(2007)
[11]	A.G. Rakoch, A.A. Gladkova, Z. Linn, D.M. Strekalina, Surf. Coat. Technol. 269, 138(2015)
[12]	J. Jovović, S. Stojadinović, N.M. Šišović, N. Konjević, J. Quant. Spectrosc. Radiat. Transf. 113, 1928 (2012)
[13]	C.S. Dunleavy, I.O. Golosnoy, J.A. Curran, T.W. Clyne, Surf. Coat. Technol. 203, 3410(2009)
[14]	R.O. Hussein, X. Nie, D.O. Northwood, Electrochim. Acta 112, 111 (2013)
[15]	K. Wang, B.H. Koo, C.G. Lee, Y.J. Kim, S.H. Lee, E. Byon, Trans. Nonferrous Met. Soc. China 19, 866 (2009)
[16]	V. Dehnavi, X.Y. Liu, B.L. Luan, D.W. Shoesmith, S. Rohani, Surf. Coat. Technol. 251, 106(2014)
[17]	A.L. Yerokhin, X. Nie, A. Leyland, A. Matthews, S.J. Dowey, Surf. Coat. Technol. 122, 73(1999)
[18]	W.P. Li, L.Q. Zhu, Y.H. Li, Surf. Coat. Technol. 201, 1085(2006)
[19]	J. Liang, B.G. Guo, J. Tian, H.W. Liu, J.F. Zhou, W.M. Liu, T. Xu, Surf. Coat. Technol. 199, 121(2005)
[20]	M.Q. Tang, W.P. Li, H.C. Liu, L.Q. Zhu, Curr. Appl. Phys. 12, 1259(2012)
[21]	E. McCafferty, Corros. Sci. 47, 3202(2005)
[22]	Y.J. Liu, J.Y. Xu, W. Lin, C. Gao, J.C. Zhang, X.H. Chen, Rev. Adv. Mater. Sci. 33, 126(2013)
[23]	Z.J. Wang, L.N. Wu, W. Cai, A. Shan, Z.H. Jiang, J. Alloys Compd. 505, 188(2010)
[24]	A.A. Voevodin, A.L. Yerokhin, V.V. Lyubimov, M.S. Donley, J.S. Zabinski, Surf. Coat. Technol. 86-87, 516(1996)
[25]	S.T. Lu, W. Qin, X.H. Wu, X.D. Wang, G.M. Zhao, Mater. Chem. Phys. 135, 58(2012)
[26]	H.X. Li, R.G. Song, Z.G. Ji, Trans. Nonferrous Met. Soc. China 23, 406 (2013)
[27]	M. Shokouhfar, C. Dehghanian, M. Montazeri, A. Baradaran, Appl. Surf. Sci. 258, 2416(2012)
[28]	R.O. Hussein, D.O. Northwood, X. Nie, Surf. Coat. Technol. 237, 357(2013)
[29]	N.M. Alanazi, A. Leyland, A.L. Yerokhin, A. Matthews, Surf. Coat. Technol. 205, 1750(2010)
[30]	X.L. Zhang, Y.F. Zhang, L.M. Chang, Z.H. Jiang, Z.P. Yao, X.W. Liu, Mater. Chem. Phys. 132, 909(2012)
[31]	A. Venugopal, R. Panda, S. Manwatkar, K. Sreekumar, L.R. Krishna, G. Sundararajan, Trans. Nonferrous Met. Soc. China 22, 700 (2012)
[32]	M.V. Azghandi, A. Davoodi, G.A. Farzi, A. Kosari, Corros. Sci. 64, 44(2012)
[33]	B. Hirschorn, M.E. Orazem, B. Tribollet, V. Vivier, I. Frateur, M. Musiani, Electrochim. Acta 55, 6218 (2010)
[34]	A. Ehsani, M. Nasrollahzadeh, M.G. Mahjani, R. Moshrefi, H. Mostaanzadeh, J. Ind. Eng. Chem. 20, 4363(2014)
[35]	F. Bentiss, M. Traisnel, M. Lagrenee, Corros. Sci. 42, 127(2000)
[36]	H.H. Wu, Z.S. Jin, B.Y. Long, F.R. Yu, X.Y. Li, Chin. Phys. Lett. 20, 1815(2003)
[37]	T.B. Wei, F.Y. Yan, J. Tian, J. Alloys Compd. 389, 169(2005)
[38]	M.S.J. Gani, R. Mcferson, Thermochim. Acta 7, 251 (1973)

Influence of Concentrations of KOH and Na₂SiO₃ Electrolytes on the Electrochemical Behavior of Ceramic Coatings on 6061 Al Alloy Processed by Plasma Electrolytic Oxidation

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 10

References 38

Related Articles 15

Recommended Articles

Metrics

Comments

[1]	Yiran Xiong, Ziyu Zhang, Xinqiang Wu, Jibo Tan, Xiang Wang. Dissolution Behaviors of Corrosion Products on 316LN Stainless Steel in Simulated Shutdown Acid-Reducing Water Chemistry [J]. Acta Metallurgica Sinica (English Letters), 2025, 38(12): 2289-2299.
[2]	Zirui Chen, Liyuan Wang, Jiayu Zhao, Guanhua Cui, Zhuo Gao, Zhiyuan Fan, Xiaohui Shi, Junwei Qiao. Microstructure and Mechanical Properties of the Ti₆₂Nb₁₂Mo₁₂Ta₁₂W₂ Refractory High Entropy Alloy Prepared through Spark Plasma Sintering [J]. Acta Metallurgica Sinica (English Letters), 2024, 37(8): 1387-1398.
[3]	Wenquan Ding, Jieli Ma, Yong Jiang, Yiren Wang, Huiqun Liu. Developing Core-Shell Nano-Structures in FeCrAl-ODS Ferritic Alloys with the Co-Addition of Ni and Zr [J]. Acta Metallurgica Sinica (English Letters), 2024, 37(2): 364-372.
[4]	Zhenbo Zuo, Rui Hu, Xian Luo, Qingxiang Wang, Chenxi Li, Zhen Zhu, Jian Lan, Shujin Liang, Hongkui Tang, Kang Zhang. Solidification Behavior and Microstructures Characteristics of Ti-48Al-3Nb-1.5Ta Powder Produced by Supreme-Speed Plasma Rotating Electrode Process [J]. Acta Metallurgica Sinica (English Letters), 2023, 36(8): 1221-1234.
[5]	Xiao-Yang Yi, Wei Liu, Yun-Fei Wang, Bo-Wen Huang, Xin-Jian Cao, Kui-Shan Sun, Xiao Liu, Xiang-Long Meng, Zhi-Yong Gao, Hai-Zhen Wang. Effect of Sn Content on the Microstructural Features, Martensitic Transformation and Mechanical Properties in Ti-V-Al-Based Shape Memory Alloys [J]. Acta Metallurgica Sinica (English Letters), 2023, 36(8): 1247-1260.
[6]	Zhenlin Wang, Beibei Wang, Zhen Zhang, Peng Xue, Yunfei Hao, Yanhua Zhao, Dingrui Ni, Guoqing Wang, Zongyi Ma. Enhanced Fatigue Properties of 2219 Al Alloy Joints via Bobbin Tool Friction Stir Welding [J]. Acta Metallurgica Sinica (English Letters), 2023, 36(4): 586-596.
[7]	Izuchukwu K. Nwokolo, Hongwei Shi, Paul C. Uzoma, Sharjeel Ahmed, Jiwen Li, Fuchun Liu. Protective Coatings Containing ZnMOF-BTA Metal-Organic Framework for Active Protection of AA2024-T3 [J]. Acta Metallurgica Sinica (English Letters), 2023, 36(11): 1893-1908.
[8]	Songkuan Zhao, Bin Tang, Guoming Zheng, Mengqi Zhang, Wei Chen, Tong Zhao, Beibei Wei, Lei Zhu, Jinshan Li. Microstructure Evolution and Its Effect on Mechanical Properties in an Electron Beam Welded β-Solidified TiAl Alloy [J]. Acta Metallurgica Sinica (English Letters), 2023, 36(10): 1619-1629.
[9]	Chen Chen, Junjie Yu, Jingyu Lu, Jian Zhang, Xuan Su, Chen-Hao Qian, Yulin Chen, Weixi Ji, Manping Liu. Phase Transformation in Al/Zn Multilayers during Mechanical Alloying [J]. Acta Metallurgica Sinica (English Letters), 2023, 36(10): 1709-1718.
[10]	Hao-Jie Yan, Jun-Jie Xia, Lian-Kui Wu, Fa-He Cao. Hot Corrosion Behavior of Ti45Al8.5Nb Alloy: Effect of Anodization and Pre-oxidation [J]. Acta Metallurgica Sinica (English Letters), 2022, 35(9): 1531-1546.
[11]	Jiawei Tang, Yiren Wang, Yong Jiang, Jiangang Yao, Hao Zhang. Solute Segregation to Grain Boundaries in Al: A First-Principles Evaluation [J]. Acta Metallurgica Sinica (English Letters), 2022, 35(9): 1572-1582.
[12]	Rabia Kara, Huseyin Zengin. Tribological and Electrochemical Corrosion Properties of CNT-Incorporated Plasma Electrolytic Oxidation (PEO) Coatings on AZ80 Magnesium Alloy [J]. Acta Metallurgica Sinica (English Letters), 2022, 35(7): 1195-1206.
[13]	Xiangbin Han, Shuangbao Wang, Bo Wei, Shuai Pan, Guizhen Liao, Weizhou Li, Yuezhou Wei. Influence of Sc Addition on Precipitation Behavior and Properties of Al-Cu-Mg Alloy [J]. Acta Metallurgica Sinica (English Letters), 2022, 35(6): 948-960.
[14]	Xin Wei, Junhua Dong, Yupeng Sun, Nan Chen, Qiying Ren, Madhusudan Dhakal, Xiaofang Li, Wei Ke. Influence of Deteriorated Bentonite Sediments on the Corrosion Behavior of NiCu Low Alloy Steel [J]. Acta Metallurgica Sinica (English Letters), 2022, 35(6): 1011-1022.
[15]	Hongchang Qian, Shangyu Liu, Wenlong Liu, Pengfei Ju, Dawei Zhang. Microbiologically Influenced Corrosion of Q235 Carbon Steel by Aerobic Thermoacidophilic Archaeon Metallosphaera cuprina [J]. Acta Metallurgica Sinica (English Letters), 2022, 35(2): 201-211.