A Review on Anodizing of Aerospace Aluminum Alloys for Corrosion Protection
Source abstract
Abstract
Aluminum alloys used for aerospace applications provide good strength to weight ratio at a reasonable cost but exhibit only limited corrosion resistance. Therefore, a durable and effective corrosion protection system is required to fulfil structural integrity. Typically, an aerospace corrosion protection system consists of a multi-layered scheme employing an anodic oxide with good barrier properties and a porous surface, a corrosion inhibited organic primer, and an organic topcoat. The present review covers published research on the anodic oxide protection layer principles and requirements for aerospace application, the effect of the anodizing process parameters, as well as the importance of process steps taking place before and after anodizing. Moreover, the challenges of chromic acid anodizing (CAA) substitution are discussed and tartaric-sulfuric acid anodizing (TSA) is especially highlighted among the environmentally friendly alternatives.
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Research context
OpenAlex topics: Anodic Oxide Films and Nanostructures · Concrete Corrosion and Durability · Corrosion Behavior and Inhibition
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials and Chemistry, Research Group: Electrochemical and Surface Engineering (SURF), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
Airbus Central Research and Technology, Willy-Messerschmitt-Straße 1, 82024 Taufkirchen, Germany
Airbus Operations GmbH, Airbus-Allee 1, 28199 Bremen, Germany
References (100+)
Show source-provided references
1. Budinski, K.G., and Budinski, M.K. (2010). Engineering Materials: Properties and Selection, Prentice Hall.
2. Gialanella, S., and Malandruccolo, A. (2019). Aerospace Alloys, Springer International Publishing. Topics in Mining, Metallurgy and Materials Engineering.10.1007/978-3-030-24440-8 ↗
3. Birbilis, N. (2011). Hughes High Strength Al-Alloys: Microstructure, Corrosion and Principles of Protection. Recent Trends in Processing and Degradation of Aluminum Alloys, IntechOpen. Chapter 10.
4. How complex is the microstructure of AA2024-T3?10.1016/j.corsci.2009.05.001 ↗
5. Chromate-free chemical conversion coatings for aluminum alloys10.1515/corrrev-2019-0032 ↗
6. Recent advances in energy efficient PEO processing of aluminum alloys10.1016/S1003-6326(17)60166-3 ↗
7. Del Olmo, R., Mohedano, M., Visser, P., Matykina, E., and Arrabal, R. (2020). Flash-PEO coatings loaded with corrosion inhibitors on AA2024. Surf. Coat. Technol., 126317.10.1016/j.surfcoat.2020.126317 ↗
8. Chromate Conversion Coatings
9. Introduction to plasma electrolytic oxidation—An overview of the process and applications10.3390/coatings10070628 ↗
10. McCafferty, E. (2010). Introduction to Corrosion Science, Springer.10.1007/978-1-4419-0455-3 ↗
11. Benavides, S. (2009). Corrosion Control in the Aerospace Industry, Elsevier Science.10.1201/9781439829202.ch1 ↗
12. United States Department of Labor OSHA, Toxic and Hazardous Substances in Occupational Exposure to Hexavalent Chromium. Regulatory standard 29 CFR 1910.1026 and 29 CFR 1926.1126 Federal Register Number 71:10099-10385 29 2006.
13. Regulation (EC) No 1907/2006 of the European Parliament and of the Council of 18 December 2006 concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), establishing a European Chemicals Agency, amending Directive 1999/45/EC and repealing Council Regulation (EEC) No 793/93 and Commission Regulation (EC) No 1488/94 as well as Council Directive 76/769/EEC and Commission Directives 91/155/EEC, 93/67/EEC, 93/105/EC and 2000/21/EC 2006. Official journal L396, pp. 1–849.
14. Influence of molybdate species on the tartaric acid/sulfuric acid anodic films grown on AA2024 T3 aerospace alloy10.1016/j.corsci.2009.05.034 ↗
15. Role of Tartaric Acid on the Anodizing and Corrosion Behavior of AA 2024 T3 Aluminum Alloy10.1149/1.3077602 ↗
16. Towards Cr(VI)-free anodization of aluminum alloys for aerospace adhesive bonding applications: A review10.1007/s11705-017-1641-3 ↗
17. Mechanism of Passive Layer Formation on AA2024-T3 from Alkaline Lithium Carbonate Solutions in the Presence of Sodium Chloride10.1149/2.1011802jes ↗
18. EIS characterisation of anodic films formed on 2024 aluminum alloy, in sulfuric acid containing molybdate or permanganate species10.1016/j.corsci.2004.06.019 ↗
19. Cerium tartrate as a corrosion inhibitor for AA 2024-T310.1016/j.corsci.2015.03.010 ↗
20. Anodic films containing polyaniline and nanoparticles for corrosion protection of AA2024T3 aluminum alloy10.1016/j.surfcoat.2008.11.023 ↗
21. pH responsive Ce(III) loaded polyaniline nanofibers for self-healing corrosion protection of AA2024-T310.1016/j.porgcoat.2016.04.046 ↗
22. Synergistic effect of V and Mn oxyanions for the corrosion protection of anodized aerospace aluminum alloy10.1016/j.surfcoat.2014.04.062 ↗
23. Porous anodic oxide film with self-healing ability for corrosion protection of aluminum10.1016/j.electacta.2018.11.119 ↗
24. Corrosion inhibitors for anodised aluminum10.1016/j.surfcoat.2013.02.029 ↗
25. Nanoparticle-based impregnation of chromate-free anodizing layers for corrosion protection and adhesive bonding10.1016/j.surfcoat.2018.05.048 ↗
26. Corrosion resistance of 2524 Al alloy anodized in tartaric-sulfuric acid at different voltages and protected with a TEOS-GPTMS hybrid sol-gel coating10.1016/j.surfcoat.2017.05.090 ↗
27. A new corrosion protection approach for aeronautical applications combining a Phenol-paraPhenyleneDiAmine benzoxazine resin applied on sulfo-tartaric anodized aluminum10.1016/j.porgcoat.2017.07.007 ↗
28. Structure and water-barrier properties of vanadate-based corrosion inhibitor films10.1016/j.corsci.2009.11.017 ↗
29. Hierarchically organized Li–Al-LDH nano-flakes: A low-temperature approach to seal porous anodic oxide on aluminum alloys10.1039/C7RA05593E ↗
30. Effects of graphene oxide-filled sol-gel sealing on the corrosion resistance and paint adhesion of anodized aluminum10.1016/j.apsusc.2019.02.005 ↗
31. Corrosion-Resistant Porous Alumina Formed via Anodizing Aluminum in Etidronic Acid and Its Pore-Sealing Behavior in Boiling Water10.1149/2.0221912jes ↗
32. Marzocchi, V., Iglesias-Rubianes, L., Thompson, G., and Bellucci, F. (2007). The influence of tartaric acid additions on the anodizing behavior of AA2024-T3 alloy in sulfuric acid. Corros. Rev., 25.10.1515/CORRREV.2007.25.3-4.461 ↗
33. Corrosion protection of AA2024 sealed anodic layers using the hydrophobic properties of carboxylic acids10.1016/j.surfcoat.2009.05.008 ↗
34. The effect of different carboxylic acids on the sulfuric acid anodizing of AA202410.1016/j.surfcoat.2019.125283 ↗
35. Corrosion resistance of tartaric-sulfuric acid anodized AA2024-T3 sealed with Ce and protected with hybrid sol–gel coating10.1016/j.surfcoat.2019.05.028 ↗
36. Cross-sectional characterization of the conversion layer formed on AA2024-T3 by a lithium-leaching coating10.1016/j.apsusc.2020.145665 ↗
37. Compositional study of a corrosion protective layer formed by leachable lithium salts in a coating defect on AA2024-T3 aluminum alloys10.1016/j.porgcoat.2018.02.011 ↗
38. Bifunctional coatings: Coupling an organic adhesion promoter with an anticorrosion inorganic layer10.1039/C9RA03657A ↗
39. Brace, A.W., and Sheasby, P.G. (1979). The Technology of Anodizing Aluminum, Technicopy Limited.
40. Aerts, T. (2009). Study of the Influence of Temperature and Heat Transfer during Anodic Oxide Growth on Aluminum. [Ph.D. Thesis, Vrije Universiteit Brussel].
41. Porous anodic alumina: Fabrication, characterization and applications10.1016/S0040-6090(96)09440-0 ↗
42. Abrahami, S. (2016). Cr(VI)-Free Pre-Treatments for Adhesive Bonding of Aerospace Aluminum Alloys. [Ph.D. Thesis, Delft University of Technology].
43. Sulka, G.D. (2008). Highly Ordered Anodic Porous Alumina Formation by Self-Organized Anodizing. Nanostructured Materials in Electrochemistry, John Wiley & Sons, Ltd.10.1002/9783527621507.ch1 ↗
44. Anion incorporation and migration during barrier film formation on aluminum10.1016/0010-938X(87)90121-1 ↗
45. Garcia Rubio, M. (2009). Optimisation of a Non-Chromium Containing Tartaric Acid/Sulfuric Acid Anodising Bath for Aluminum Alloy for Aerospace Industry Application. [Ph.D. Thesis, Universidad Auntonoma de Madrid].
46. The behavior of second phase particles during anodizing of aluminum alloys10.1016/j.corsci.2010.03.029 ↗
47. Modelling the anodizing behavior of aluminum alloys in sulfuric acid through alloy analogues10.1016/j.corsci.2008.09.019 ↗
48. Macroscopic and Local Filming Behavior of AA2024 T3 Aluminum Alloy during Anodizing in Sulfuric Acid Electrolyte10.1149/1.2931522 ↗
49. Effects of oxygen evolution on the voltage and film morphology during galvanostatic anodizing of AA 2024-T3 aluminum alloy in sulfuric acid at −2 and 24 °C10.1016/j.electacta.2018.03.121 ↗
50. 5-Anodic Films on Aluminum10.1016/B978-0-12-633670-2.50010-3 ↗
51. The observation of anodic oxide films on aluminum by high resolution electron microscopy10.1016/0010-938X(90)90115-L ↗
52. Considerations on the adsorbed water concentration of sulfuric porous aluminum oxide10.1016/0040-6090(94)90697-1 ↗
53. Wernick, S., and Pinner, R. (1972). Surface Treatment and Finishing of Aluminum and Its Alloys, Robert Draper Ltd.. [4th ed.].
54. Effect of Temperature of Oxalic Acid on the Fabrication of Porous Anodic Alumina from Al-Mn Alloys10.1155/2013/167047 ↗
55. Porous Anodic Aluminum Oxide: Anodization and Templated Synthesis of Functional Nanostructures10.1021/cr500002z ↗
56. The determination of the porosity of anodic oxide films on aluminum by the pore-filling method10.1016/0010-938X(78)90012-4 ↗
57. The morphology and mechanism of formation of porous anodic films on aluminum
58. The role of electric field in pore formation during aluminum anodization10.1016/j.electacta.2011.02.002 ↗
59. Compositional Evidence for Flow in Anodic Films on Aluminum under High Electric Fields10.1149/1.2756971 ↗
60. Stress generated porosity in anodic alumina formed in sulfuric acid electrolyte10.1016/j.corsci.2007.03.036 ↗
61. A Tracer Study of Porous Anodic Alumina10.1149/1.2335938 ↗
62. A theory for breakdown of anodic oxide films on metals10.1016/0013-4686(71)85079-X ↗
63. Stress generation during anodic oxidation of titanium and aluminum10.1016/0010-938X(93)90009-6 ↗
64. The Mechanical Properties of Thin Anodic Films on Aluminum10.1149/1.2423797 ↗
65. Intrinsic stresses in anodic films on aluminum10.1016/0013-4686(81)85135-3 ↗
66. The mechanism of stress generation during the growth of anodic oxide films on pure aluminum in acidic solutions10.1016/S0013-4686(97)10194-3 ↗
67. Fabrication of porous anodic alumina (PAA) templates with straight pores and with hierarchical structures through exponential voltage decrease technique10.1016/j.surfcoat.2019.02.086 ↗
68. Graded Anodic Film Morphologies for Sustainable Exploitation of Aluminum Alloys in Aerospace10.4028/www.scientific.net/AMR.38.48 ↗
69. Potentiodynamic anodizing of aluminum alloys in Cr(VI)-free electrolytes10.1002/sia.5919 ↗
70. Cyclic oxidation processes during anodizing of Al–Cu alloys10.1016/j.electacta.2007.05.052 ↗
71. Self-ordering of anodic porous alumina induced by local current concentration: Burning10.1149/1.1738553 ↗
72. Influence of local heat development on film thickness for anodizing aluminum in sulfuric acid10.1149/1.1560639 ↗
73. The temperature rise and burning for high rate anodizing of aluminum in oxalic acid10.2464/jilm.40.382 ↗
74. Effects of temperature and voltage mode on nanoporous anodic aluminum oxide films by one-step anodization10.1016/j.tsf.2011.08.053 ↗
75. AC-anodising of aluminum: Contribution to electrical and efficiency study10.1016/j.electacta.2006.07.010 ↗
76. Ashcroft, I., Cartwright, T., Bahrani, D., and Critchlow, G. (2011). Anodising aluminum alloy. (7922889B2), U.S. Patent.
77. Kinetics of formation of complex anodic oxide films on aluminum10.1016/S0254-0584(01)00539-9 ↗
78. Fabrication of porous anodic alumina membranes with ultrathick barrier layer10.1016/j.matlet.2008.02.026 ↗
79. Comparison between the influence of applied electrode and electrolyte temperatures on porous anodizing of aluminum10.1016/j.electacta.2010.02.044 ↗
80. Parametric study on the anodization of pure aluminum thin film used in fabricating nano-pores template10.1016/S1452-3981(23)13008-2 ↗
81. Schnaut, U., Gammel, F., Fangmeier, A., and Kock, E. (2003, January 18–22). Surface Treatment of Aluminum in Aerospace: Today and Tomorrow. Proceedings of the 3rd Aluminium Surface Science & Technology Symposium, Bonn, Germany. Available online: http://www.asst2018.com/home/.
82. Atmospheric corrosion of bare and anodized aluminum in a wide range of environmental conditions. Part I: Visual observations and gravimetric results10.1016/S0257-8972(01)01680-2 ↗
83. XPS analysis of the surface chemistry and interfacial bonding of barrier-type Cr(VI)-free anodic oxides10.1021/acs.jpcc.5b05958 ↗
84. Cramer, S.D., and Covino, B.S. (2003). Corrosion: Fundamentals, Testing, and Protection, ASM International.10.31399/asm.hb.v13a.9781627081825 ↗
85. Mobility of copper ions in anodic alumina films10.1016/S0013-4686(96)00454-9 ↗
86. Pulsed current effect on hard anodizing process of 2024-T3 aluminum alloy10.1016/j.surfcoat.2016.01.056 ↗
87. Torrescano-Alvarez, J.M., Curioni, M., Zhou, X., and Skeldon, P. (2018). Effect of anodizing conditions on the cell morphology of anodic films on AA2024-T3 alloy. Surf. Interface Anal., 51.10.1002/sia.6562 ↗
88. Cavezza, F., Boehm, M., Terryn, H., and Hauffman, T. (2020). A review on adhesively bonded aluminum joints in the automotive industry. Metals, 10.10.3390/met10060730 ↗
89. Probing the formation and degradation of chemical interactions from model molecule/metal oxide to buried polymer/metal oxide interfaces10.1038/s41529-019-0085-2 ↗
90. Adhesion performance of an epoxy clear coat on aluminum alloy in the presence of vinyl and amino-silane primers10.1016/j.porgcoat.2006.09.007 ↗
91. Acid-Base Interactions in Polymer Adhesion10.1016/S0167-8922(08)70878-2 ↗
92. Study on the interfacial interactions of sulfated alumina with epoxy polymer10.1016/j.ceramint.2019.01.223 ↗
93. Effect of anodic aluminum oxide chemistry on adhesive bonding of epoxy10.1021/acs.jpcc.6b04957 ↗
94. The role of acid-base properties in the interactions across the oxide-primer interface in aerospace applications10.1002/sia.5907 ↗
95. Pizzi, A., and Mittal, K.L. (2003). Handbook of Adhesive Technology, Revised and Expanded, Taylor & Francis.10.1201/9780203912225 ↗
96. Adhesion of polymers10.1016/j.progpolymsci.2009.04.007 ↗
97. Interface strength and degradation of adhesively bonded porous aluminum oxides10.1038/s41529-017-0007-0 ↗
98. Self-assembling adhesion promoters for corrosion resistant metal polymer interfaces10.1016/S0300-9440(98)00010-1 ↗
99. Effects of salt spray on the mechanical properties of aluminum-epoxy adhesive joints10.1080/01694243.2012.747730 ↗
100. Funke, W. (1995). Improvement of Wet Adhesion of Organic Coatings by Thin Adhesion Layer. Surface Phenomena and Lateyes in Waterborne Coatings and Printing Technology, Springer.10.1007/978-1-4757-2395-3_9 ↗