Preparation and properties of Al-Ni composite anodic films on aluminum surface

Abstract

Ni element was introduced to aluminum surface by a simple chemical immersion method, and Al-Ni composite anodic films were obtained by following anodizing. The morphology, structure and composition of the Al-Ni anodic films were examined by scanning electron microscopy (SEM), energy disperse spectroscopy (EDS) and atomic force microscopy(AFM). The electrochemical behaviors of the films were studied by means of polarization measurement and electrochemical impedance spectroscopy (EIS). The experimental results show that the Al-Ni composite anodic film is more compact with smaller pore diameters than that of the Al anodic film. The introduction of nickel increases the impedances of both the barrier layer and the porous layer of the anodic films. In NaCl solutions, the Al-Ni composite anodic films show higher impedance values and better corrosion resistance.

Keywords

aluminum / anodizing / composite anodic film / corrosion resistance

References

[1] Furneaux R. C., Rigby W. R., Davidson A. P. The Formation of Controlled-porousty Membranes from Anodicall Oxidized Aluminum[J]. Nature, 1989, 337(6203): 147-149.

[2] Li A. P., Muller F., Bimer A., . Hexagonal Pore Arrays with a 50–420 nm Interpore Distance Formed by Self-organization in Anodic Alumina[J]. J. Appl. Phys, 1998, 84(11): 6 023-6 026.

[3] Crossland A. C., Thompson G. E., Skeldon P., . Anodic Oxidation of Al-Ce Alloys and Inhibitive Behaviour of Cerium Species[J]. Corros. Sci., 1998, 40(6): 871-885.

[4] Liu Z., Gao W., Li M. Cyclic Oxidation of Sputter-deposited Nanocrystalline Fe-Cr-Ni-Al Alloy Coatings[J]. Oxidation of Metals, 1999, 51(5/6): 403-419.

[5] Wolf G. K. An historical Perspective of Ion Bombardment Research for Corrosion Studies[J]. Surf. Coat. Technol., 1996, 83(1–3): 1-9.

[6] Metroke T. L., Parkhill R. L., Knobbe E. T. Passivation of Metal Alloys Using Sol-gel-derived Materials-a Review[J]. Prog. Organ. Coat., 2001, 41(4): 233-238.

[7] Brown G. M., Shimizu K., Kobayashi K., . The Growth of a Porous Oxide Film of a Unique Morphology by Anodic Oxidation of an Al-0.5 wt% Ni Alloy[J]. Corros. Sci., 1998, 40(9): 1 575-1 586.

[8] Tzoganakoua K., Skeldona P., Thompsona G.E., . Mobility of Lithium Ions in Anodic Alumina Formed on an Al-Li Alloy[J]. Corros. Sci., 2000, 42(6): 1 083-1 091.

[9] Bucheit Jr, Rudolph G, Stoner, et al. Method for Increasing the Corrosion Resistance of Aluminum and Aluminum Alloys[P]. US: RE35576, 1997

[10] Ye H., Zuo Y., Xiong J. P., . Introduction of Li⁺ Ions Into Anodic Film by Hydrotalcite Precursor and Rlectrochemical Behavior[J]. Adv. Mater. Res., 2006, 11–12: 509-512.

[11] Merlen E., Gueroult P., D’Espinose de la Caillerie J.-B., . Hydrotalcite Formation at the Alumina/water Interface During Impregnation with Ni(II) Aqueous Solutions at Neutral pH[J]. Appl. Clay Sci., 1995, 10(1–2): 45-56.

[12] Tian L. P., Zuo Y., Zhao X. H., . The Improved Corrosion Resistance of Anodic Films on Aluminum by Nickel Ions Implantation[J]. Surf. Coat. Technol., 2006, 201(6): 3246-3252.

[13] Tian L.P., Zhao X. H., Zuo Y., . The Electrochemical Behavior of Anodic Alumina Films Implanted with Ni Ions[J]. Mater. Chem. Phys., 2007, 104(1): 24-29.

[14] Hitzig J., Junttner K., Lorentz W. J., . AC-impedance Measurements on Porous Aluminium Oxide Films[J]. Corros. Sci., 1984, 24(11–12): 945-952.

[15] Zhao X. H., Zuo Y., Zhao J. M., . A study on the Self-sealing Process of Anodic Films on Aluminum by EIS[J]. Surf. Coat. Technol., 2006, 200(24): 6 846-6 853.

[16] Hao L., Cheng B. R. Sealing Processes of Aluminum Coatings: Past, Present, and Future[J]. Metal Finishing, 2000, 98(12): 8-10.

[17] Zhao X. H., Zuo Y., Zhao J. M. Electrochemical Properties of Anodized Aluminum Films in Sodium Chloride Solution[J]. The Chinese Journal of Nonferrous Metals, 2004, 14(4): 562-567.

[18] Celati N., Catherine M. C. S., Keddam M., . Electrochemical Impedance Spectroscopy Characterization of the Protection by Anodized Layers on Aluminum Alloys[J]. Mater. Sci. Forum, 1995, 192–194(pt1): 335-344.

[19] Bockris J.O.’.M., Kang Y. K. The Protectivity of Aluminum and Its Alloys with Transition Metals[J]. J. Solid State Electrochem., 1997, 1(1): 17-35.

[20] Kobotiatis L., Kioupis N., Koutsoukos P.G. Electronic Properties of Passive Films Grown on Al 7075 in Solutions Containing Oxalate and Chromate[J]. Corrosion, 1997, 53(7): 562-575.