Electrochemical Characteristics of the Rare Earth Compound Coating on 6061 Aluminum Alloy


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The composite coatings were prepared on aluminum alloy by anodizing and chemical conversion method. The coatings consisted of a anodic oxide coating and a rare earth conversion coating. The surface morphology and composition of the composite coatings were analyzed by scanning electron microscopy (SEM) and energy dispersive X-rays (EDX). The electrochemical properties of the different samples were researched by Potentiodynamic polarisation and electrochemical impedance spectroscopy in a 3.5-wt.% NaCl solution. The results showed that corrosion current density of the sample with composite coatings was 3.611×10-9 A·cm-2, impedance was 6.107×105 Ω·cm-2. The composite coatings had better corrosion resistance than the sample with anodic oxide film and the aluminum alloy substrate.



Edited by:

Dongye Sun, Wen-Pei Sung and Ran Chen




Y. Q. Wen et al., "Electrochemical Characteristics of the Rare Earth Compound Coating on 6061 Aluminum Alloy", Applied Mechanics and Materials, Vols. 71-78, pp. 2361-2365, 2011

Online since:

July 2011




[1] Y.H. Song, Z.C. Guo, A.L. Li, et al. Current status and development trend of anodic oxidation, coloring and sealing of aluminum and its alloys [J]. Electroplating & Finishing, 2002, 21(6): 27-33 (in chinese).

[2] L.Q. Zhu. Electroplating theory and technology of Functional coating[M]. Beijing: BEIHANG UNIVERSITY PRESS, 2005, 217-245 (in chinese).

[3] D.R. Arnott, N.E. Ryan, B.R.W. Hinton, et al. Auger and XPS studies of cerium corrosion inhibition on 7075 aluminum alloy[J]. Applied Surface Science, 1985, (22-23): 236-251.

DOI: https://doi.org/10.1016/0378-5963(85)90056-x

[4] M. Dabala, L. Armelao, A. Buchberger, et al. Cerium-based conversion layers on aluminum alloys[J]. Applied Surface Science, 2001, 172 (3-4): 312-322.

DOI: https://doi.org/10.1016/s0169-4332(00)00873-4

[5] W.G. Fahrenholtz, M.J. O'Keefe, H.F. Zhou, et al. Characterization of cerium-based conversion coatings for corrosion protection of aluminum alloys[J]. Surface and Coatings Technology, 2002, 155(2-3) : 208-213.

DOI: https://doi.org/10.1016/s0257-8972(02)00062-2

[6] A. Decroly, J. -P. Petitjean. Study of the deposition of cerium oxide by conversion on to aluminium alloys[J]. Surface and Coatings Technology. 2005, 194 (1): 1-9.

DOI: https://doi.org/10.1016/j.surfcoat.2004.05.012

[7] F.H. Scholes, C. Soste, A.E. Hughes, et al. The role of hydrogen peroxide in the deposition of cerium-based conversion coatings[J]. Applied Surface Science, 2006, 253(4): 1770-1780.

DOI: https://doi.org/10.1016/j.apsusc.2006.03.010

[8] M. Bethencourt, F.J. Botana, M.J. Cano, et al. Advanced generation of green conversion coatings for aluminium alloys[J]. Applied Surface Science, 2004, 238 (1-4): 278-281.

DOI: https://doi.org/10.1016/j.apsusc.2004.05.268

[9] M.A. Arenas, J.J. de Damborenea. Growth mechanisms of ceriumlayers on galvanised steel[J]. Electrochimica Acta, 2003, 48: 3693.

DOI: https://doi.org/10.1016/s0013-4686(03)00507-3

[10] P. Campestrini, H. Terryn, A. Hovestad. Formation of a cerium-based conversion coating on AA2024 relationship with the microstructure[J]. Surface and Coatings Technology, 2004, 176(3): 365.

DOI: https://doi.org/10.1016/s0257-8972(03)00743-6

[11] D.R. Arnott, N.E. Ryan, B.R.W. Hinton. Auger and XPS studies of cerium corrosion ion 7075 aluminum alloy[J]. Surface and Coatings Technology, 1984, 22-23(1): 236.

DOI: https://doi.org/10.1016/0378-5963(85)90056-x

[12] M. Bethencourt, F.J. Botana, M.J. Cano. Advanced generation of green conversion coatings for aluminum alloys[J]. Applied Surface Science, 2004, 238(1/4): 278.

DOI: https://doi.org/10.1016/j.apsusc.2004.05.268

[13] M.A. Arenas, A. Conde, J.J. de Damborenea. Cerium: a suitable green corrosion inhibitor for tinplate[J]. Corrosion Science, 2002, 44: 511.

DOI: https://doi.org/10.1016/s0010-938x(01)00053-1

[14] A. Aballe, M. Bethencourt, F.J. Botana. CeCl3 and LaCl3 binary solutions as environment-friendly corrosion inhibitors of AA5083 Al-Mg alloy in NaCl solutions[J]. Journal of Alloys and Compounds, 2001, 323/324: 855.

DOI: https://doi.org/10.1016/s0925-8388(01)01160-4

[15] X.W. Yu, C.N. Cao, Z.M. Yao. Study of double layer rare earth metal conversion coating on aluminum alloy LY12[J]. Corrosion Science, 2001, 36(43): 1283.

DOI: https://doi.org/10.1016/s0010-938x(00)00141-4

[16] A. Bai, P.Y. Chuang, C.C. Hu, The corrosion behavior of Ni–P deposits with high phosphorous contents in brine media[J]. Materials Chemistry and Physics, 2003, 82 (1): 93-100.

DOI: https://doi.org/10.1016/s0254-0584(03)00193-7

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