On the microstructural control of localized corrosion in non-anodized and TSA-anodized AA7475-T761 aluminium alloy
Source abstract
Abstract
The corrosion behaviour of the AA7475-T761 alloy in non-anodized and tartaric–sulfuric acid (TSA) anodized conditions in a chloride environment is investigated. In the non-anodized alloy, localized corrosion initiated at constituent intermetallic particles (IMPs) and grain boundary precipitates, leading to trenching and intergranular attack. In contrast, in the anodized alloy, corrosion initiated at defects located at the film/alloy interface, originating from the dissolution of IMPs during anodizing. These defective regions acted as preferential pathways for electrolyte ingress, promoting underfilm corrosion and pit growth beneath the oxide. While the anodic film delayed the onset of corrosion, the highly localized nature of the attack in the anodized sample increased the severity of the damage once initiated.
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Research context
OpenAlex topics: Anodic Oxide Films and Nanostructures · Aluminum Alloy Microstructure Properties · Corrosion Behavior and Inhibition
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (94)
Show source-provided references
1. Advanced aluminium matrix composites: the critical need of automotive and aerospace engineering fields10.1016/j.matpr.2015.07.290 ↗
2. Development of aluminum alloy materials: Current status, trend, and prospects10.15302/J-SSCAE-2020.05.013 ↗
3. A historical, statistical and electrochemical approach on the effect of microstructure in the anodizing of Al alloys: a review10.1080/10408436.2023.2230250 ↗
4. Electrochemical behaviour of inter-metallic phases in sulfuric acid at high voltage—anodization of Al7Cu2Fe and MgZn2 phase
5. Anodisation of aluminium alloys by micro-capillary technique as a tool for reliable, cost-efficient, and quick process parameter determination10.1155/2016/1374897 ↗
6. Electrochemical behavior of anodized AA7075-T73 alloys as affected by the matrix structure10.1016/j.apsusc.2013.06.094 ↗
7. Influence of hard anodizing on the mechanical and corrosion properties of different aluminum alloys10.1007/s13632-019-00594-5 ↗
8. Interfacial phenomena in 7000 series alloys and their impact on the anodic oxide10.1016/j.matpr.2015.10.096 ↗
9. Anodisation of aluminium alloy AA7075: influence of intermetallic particles on anodic oxide growth10.1016/j.corsci.2019.108319 ↗
10. Corrosion improvement of AA7075 through precipitation hardness and anodization10.1016/j.matpr.2020.04.084 ↗
11. Anodizing of multiphase aluminium alloys in sulfuric acid: In-situ electrochemical behaviour and oxide properties10.1016/j.electacta.2016.06.131 ↗
12. Anodising and corrosion resistance of AA7050 friction stir welds10.1016/j.corsci.2016.10.015 ↗
13. Effect of the microstructure of Al 7050-T7451 on anodic oxide formation in sulfuric acid10.1016/S1674-4799(09)60076-5 ↗
14. Atomic emission spectroelectrochemical investigation of the anodization of AA7050T74 aluminum alloy10.1016/j.elecom.2010.11.008 ↗
15. Anodizing—The pore makes the difference10.1002/maco.202213324 ↗
16. A review on anodizing of aerospace aluminum alloys for corrosion protection10.3390/coatings10111106 ↗
17. The effect of tartaric-sulfuric acid (TSA) anodizing on the corrosion resistance of the AA7475-T761, ECS10.1149/MA2022-02142475mtgabs ↗
18. Trace elements and their impact on surface finishing characteristics of aluminum extrusions
19. Base metal microstructural considerations for anodizing aluminum extrusions
20. Anodizing complex 7000 series
21. Effect of alloy types on the anodizing process of aluminum10.1016/j.surfcoat.2005.07.065 ↗
22. Corrosion protection of clad 2024 aluminum alloy anodized in tartaric-sulfuric acid bath and protected with hybrid sol–gel coating10.1016/j.electacta.2013.09.004 ↗
23. Direct cerium-doped hybrid sol-gel sealing of TSA-anodized AA2024-T3 for corrosion protection
24. EIS behavior of anodized and primer coated AA2198-T851 compared to AA2024-T3 exposed to salt spray CASS test10.1002/sia.5982 ↗
25. EIS investigation of a Ce-based posttreatment step on the corrosion behaviour of Alclad AA2024 anodized in TSA10.1002/sia.6633 ↗
26. Tartaric-sulphuric acid anodized clad AA2024-T3 post-treated in Ce-containing solutions at different temperatures: corrosion behaviour and Ce ions distribution10.1016/j.apsusc.2020.147634 ↗
27. Corrosion protection of AA2524-T3 anodized in tartaric-sulfuric acid bath and protected with hybrid sol-gel coating10.4028/www.scientific.net/KEM.710.210 ↗
28. Corrosion resistance of 2524 Al alloy anodized in tartaric-sulphuric acid at different voltages and protected with a TEOS-GPTMS hybrid sol-gel coating10.1016/j.surfcoat.2017.05.090 ↗
29. Effect of cerium addition to a hydrothermal treatment on the corrosion protection of the tartaric-sulfuric acid anodized AA2524-T310.5006/3063 ↗
30. 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 ↗
31. The effect of different carboxylic acids on the sulfuric acid anodizing of AA2024
32. Corrosion behavior of AA2055 aluminum-lithium alloys anodized in the presence of sulfuric acid solution10.3390/coatings11111278 ↗
33. Research on corrosion resistance of anodized and sealed 6061 aluminum alloy in 3.5% sodium chloride solution10.1016/j.ijoes.2023.100092 ↗
34. Effect of citric acid hard anodizing on the mechanical properties and corrosion resistance of different aluminum alloys10.3390/ma17174285 ↗
35. Corrosion behavior of aluminum alloys in different alkaline environments: Effect of alloying elements and anodization treatments10.3390/coatings14020240 ↗
36. Effect of cerium (IV) on thin sulfuric acid anodizing of 2024-T3 alloy10.1016/j.jmrt.2021.09.117 ↗
37. de S. Araujo · 2025
38. Localized corrosion in anodized aluminium alloys: The role of constituent particle-induced defects in anodic films
39. Runge · 2018
40. Corrosion resistance of alloy 2024 anodized on sulfuric-citric acid10.1149/09401.0073ecst ↗
41. Discontinuities in the porous anodic film formed on AA2099-T8 aluminium alloy10.1016/j.corsci.2011.08.023 ↗
42. International temper designation systems for wrought aluminium alloys: Part II—Thermally treated (T temper) aluminium alloys
43. Thermomechanical treatment and corrosion resistance correlation in the AA2198 Al–Cu–Li alloy10.1080/1478422X.2019.1637077 ↗
44. An assessment of pitting corrosion in anodized aluminum alloys: It might not be what it seems10.1002/maco.202313977 ↗
45. Comparison of constituent intermetallic particles in different aluminium alloys10.1007/s13632-025-01170-w ↗
46. Distribution of intermetallics in an AA2099-T8 aluminium alloy extrusion10.1016/j.matchemphys.2010.12.014 ↗
47. Anodic film formation on aluminium alloys: Analysis of defects induced by constituent intermetallic particles
48. Microstructural characteristics of the Al alloys: The dissimilarities among the 2XXX alloys series used in aircraft structures10.1007/s13632-020-00688-5 ↗
49. C. Vargel, M. Jacques, M.P. Schmidt, The most common wrought aluminium alloys, in: Corrosion of Aluminium, 2004, pp. 61–69. https://doi.org/10.1016/B978-008044495-6/50009-4..10.1016/B978-008044495-6/50009-4 ↗
50. Effect of thermo-mechanical treatment process on microstructure and mechanical properties of 2A97 Al-Li alloy10.1016/S1003-6326(14)63332-X ↗
51. Heat treatment of 7xxx series aluminium alloys—Some recent developments10.1016/S1003-6326(14)63306-9 ↗
52. Stress corrosion cracking behaviour of 7xxx aluminum alloys: A literature review10.1016/S1003-6326(16)64220-6 ↗
53. Microstructural investigation of friction stir welded 7050-T651 aluminium10.1016/S1359-6454(02)00449-4 ↗
54. Influence of particles on short fatigue crack initiation in 2050-T8 and 7050-T7410.4028/www.scientific.net/MSF.794-796.296 ↗
55. Coating residual stress effects on fatigue performance of 7050-T7451 aluminum alloy10.1016/j.surfcoat.2007.03.032 ↗
56. Kinetics of sharp intergranular corrosion fissures in AA717810.1016/j.corsci.2006.04.015 ↗
57. Intergranular corrosion following friction stir welding of aluminum alloy 7075-T65110.5006/1.3283950 ↗
58. The direct observation of copper segregation at the broad faces of η′ and η precipitates in AA7010 aluminium alloy10.1016/j.matchar.2020.110232 ↗
59. TSA anodising voltage effects on the near-surface coarse intermetallic particles in the AA2024-T3 and AA2198-T8 alloys10.1080/1478422X.2022.2071666 ↗
60. Anodizing of aluminium alloys10.1108/00022669910270709 ↗
61. Ce post-treatment for increased corrosion resistance of AA2024-T3 anodized in tartaric-sulfuric acid
62. Electrochemical characteristics of intermetallic phases in aluminum alloys: An experimental survey and discussion10.1149/1.1869984 ↗
63. The effect of pre-ageing temperature and retrogression heating rate on the strength and corrosion behaviour of AA715010.1016/j.corsci.2011.08.042 ↗
64. The advancement of 7XXX series aluminum alloys for aircraft structures: A review10.3390/met11050718 ↗
65. Revised Pourbaix diagrams for zinc at 25–300 °C10.1016/S0010-938X(97)89246-3 ↗
66. Nonprecious electrocatalysts for Li-air and Zn-air batteries: Fundamentals and recent advances10.1109/MNANO.2017.2710380 ↗
67. Localized corrosion in AA2099-T83 aluminum-lithium alloy: The role of intermetallic particles10.1016/j.matchemphys.2015.05.037 ↗
68. FIB-SEM investigation on corrosion propagation of aluminium-lithium alloy in sodium chloride solution10.1179/1743278214Y.0000000235 ↗
69. Scanning electrochemical microscopy: Introduction and principles10.1021/ac00177a011 ↗
70. 2007
71. Charging” effects in the scanning electron microscope10.1088/0022-3735/4/9/002 ↗
72. Corrosion behavior of anodized Al-Cu-Li alloy: The role of intermetallic particle-introduced film defects10.1016/j.corsci.2019.108110 ↗
73. Microstructural origin of localized corrosion in anodized AA2099-T8 aluminium-lithium alloy10.1002/sia.5856 ↗
74. Anodic film growth on Al-Li-Cu alloy AA2099-T810.1016/j.electacta.2012.06.126 ↗
75. The influences of sealing methods on corrosion behavior of anodized aluminum alloys in NaCl solutions10.1016/S0257-8972(02)00779-X ↗
76. Stable pit formation on AA2024-T3 in a NaCl environment10.1016/j.corsci.2009.08.043 ↗
77. Corrosion of AA2024-T3 Part I: Localised corrosion of isolated IM particles10.1016/j.corsci.2010.09.009 ↗
78. Corrosion of AA2024-T3 Part II: Co-operative corrosion10.1016/j.corsci.2010.09.030 ↗
79. Corrosion of AA2024-T3 Part III: Propagation10.1016/j.corsci.2010.09.035 ↗
80. Effect of unequal levels of deformation and fragmentation on the electrochemical response of friction stir welded AA2024-T3 alloy10.1016/j.electacta.2019.04.137 ↗
81. Transitions between pitting and intergranular corrosion in AA202410.1016/S0013-4686(02)00828-9 ↗
82. Electron microscopic study of growing mechanism of aluminium anodic oxide film
83. Ul-Hamid · 2018
84. Shimizu · 2010
85. Initial cathodic reactivity of intermetallic particles in 7175 aluminum alloy buried under 6 µm thick anodized oxide layer revealed by in-situ reflective microscopy10.1016/j.electacta.2024.144155 ↗
86. Effects of surface preparation on the corrosion resistance of TSA anodized aluminum alloys
87. Role of anodic oxide films in the corrosion of aluminum and its alloys10.1515/corrrev-2017-0048 ↗
88. The cathodic polarization of aluminum covered with anodic oxide films in a neutral borate solution—II. Film breakdown and pit formation10.1016/0010-938X(94)90074-4 ↗
89. The growth mechanism of pits in NaCl solution under anodic films on aluminum10.1016/j.surfcoat.2004.04.054 ↗
90. Characterisation of pitting corrosion in sealed anodic films formed in sulphuric, sulphuric/molybdate and chromic media10.1016/S0169-4332(02)01240-0 ↗
91. Molybdate/sulfuric acid anodising of 2024-aluminium alloy: Influence of inhibitor concentration on film growth and on corrosion resistance10.1016/S0257-8972(03)00511-5 ↗
92. The sealing step in aluminum anodizing: A focus on sustainable strategies for enhancing both energy efficiency and corrosion resistance10.3390/coatings10030226 ↗
93. Citric acid as an alternative to sulfuric acid for hard anodizing in aluminum alloys used in the aeronautical industry10.1149/11001.0225ecst ↗
94. Corrosion resistance of aluminum alloy AA2024 with hard anodizing in sulfuric acid-free solution10.3390/ma15186401 ↗