Tolerable corrosion damage on aircraft aluminum structures: Local cladding patterns

Pantelakis, Spiros; Chamos, Apostolos; Setsika, Dorothea

doi:10.1016/j.tafmec.2012.02.008

Cited by 7 publications

(9 citation statements)

References 19 publications

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“…Investigations 23 as well as industrial practice 24 indicate that in-service obtained corrosion damage correlates well to the one caused by a 3.5% NaCl solution, 23 with pitting density, depth and shape evolving with exposure time. Investigations 23 as well as industrial practice 24 indicate that in-service obtained corrosion damage correlates well to the one caused by a 3.5% NaCl solution, 23 with pitting density, depth and shape evolving with exposure time.…”

Section: Introductionmentioning

confidence: 80%

Effect of environment's aggressiveness on the corrosion damage evolution and mechanical behavior of AA 2024‐T3

Vasco

Chamos

Pantelakis

2017

Fatigue Fract Eng Mat Struct

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The aim of this work is to contribute on establishing correlations between corrosion damage from accelerated laboratory corrosion tests of varying aggressiveness; by accounting for both, the metallographic features of corrosion damage and the mechanical properties of the corroded material. The work is based on the investigation of corrosion damage caused by the exposure of 2024‐T3 aluminum alloy to 3.5% NaCl solution, which is presently considered to properly represent in‐service exposure. Corrosion damage evolution was quantified for periods ranging between 500 and 3000 hours by evaluating pitting density, depth, and diameter. It was compared to available results of corrosion damage of the same alloy subjected to exfoliation corrosion test. Furthermore, the tensile properties of precorroded material in each solution were evaluated. The results allow the formulation of correlation functions between corrosion damage geometrical metallographic features from low‐ to high‐aggressiveness environment exposures. On the other hand, the degradation of tensile properties, and particularly of tensile ductility, is more pronounced in specimens exposed to higher corrosion rate environments, even when damage in both environments leads to equivalent metallographic features. This suggests significant differences in the underlying physical mechanisms of the damage accumulation process when the same material is exposed to different corrosive solutions. This work suggests the need to expand current corrosion damage interpretation, to account not only for geometrical metallographic features but also for mechanical properties of the affected material.

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Section: Introductionmentioning

confidence: 80%

Effect of environment's aggressiveness on the corrosion damage evolution and mechanical behavior of AA 2024‐T3

Vasco

Chamos

Pantelakis

2017

Fatigue Fract Eng Mat Struct

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“…With distancing of the affected layer, and approaching the characteristics of the raw material, load carrying capacity is restored and the maximum depth of penetration decreases, leading to increased nanoindentation hardness values. However, the HEDE mechanism alone does not seem sufficient to explain all the effects of HE observed in previous works, such as the presence of a quasi-cleavage zone in tensile fracture surfaces or the decrease in strain of corroded specimens [2][3][4][5][6]21,23]. Most likely, a combination of different mechanisms is responsible for these results, with the need of more experimental observations to fully characterize the main acting mechanism.…”

Section: Experimental Tests and Findingsmentioning

confidence: 85%

“…Corrosion damage in aeronautical aluminum alloys may appear in the form of pits, intergranular corrosion and exfoliation corrosion [2][3][4]. Only a few concepts were reported, aiming to directly correlate the metallographic features, which characterize corrosion damage of a material to the resulting degradation of its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Tensile Behavior of Corroded Aluminum Alloy 2024 T3 Considering the Hydrogen Embrittlement

Vasco

Τσερπές

Pantelakis

2018

Metals

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A multi-scale modeling approach for simulating the tensile behavior of the corroded aluminum alloy 2024 T3 was developed, accounting for both the geometrical features of corrosion damage and the effect of corrosion-induced hydrogen embrittlement (HE). The approach combines two Finite Element (FE) models: a model of a three-dimensional Representative Unit Cell (RUC), representing an exfoliated area and its correspondent hydrogen embrittled zone (HEZ), and a model of the tensile specimen. The models lie at the micro-and macro-scales, respectively. The characteristics of the HEZ are determined from measurements of nanoindentation hardness, conducted on pre-corroded specimens. Using the model of the RUC, the local homogenized mechanical behavior of the corroded material is simulated. Then, the behavior of the exfoliated areas is assigned into different areas (elements) of the tensile specimen and final analyses are performed to simulate the tensile behavior of the corroded material. The approach was applied to model specimens after 8, 16 and 24 h exposure periods of the Exfoliation Corrosion (EXCO) test. For validation of the approach, tensile tests were used. The numerical results show that this approach is suitable for accurately simulating the tensile behavior of pre-corroded experimental specimens, accounting for both geometrical features of corrosion damage and corrosion-induced HE.

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“…Petroyiannis et al have suggested in previous works that a continuous cladding layer may be excessive and that the application of a partial cladding pattern may provide 2 Advances in Materials Science and Engineering equivalent corrosion protection for aluminum 2024 T3 alloys [5,6]. They have found that a partial cladding layer covering only 7% of the core aluminum substrate provides equivalent corrosion protection to the mechanical properties of Al 2024 T3 when compared to Alclad products after a 300-hour immersion exposure in a neutral 3.5% NaCl solution.…”

Section: Introductionmentioning

confidence: 99%

“…They have found that a partial cladding layer covering only 7% of the core aluminum substrate provides equivalent corrosion protection to the mechanical properties of Al 2024 T3 when compared to Alclad products after a 300-hour immersion exposure in a neutral 3.5% NaCl solution. However, they have also concluded that this accelerated corrosion test is likely too mild to accurately represent the corrosion environment experienced by in service aircraft [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Partial Cladding Pattern of Aluminum 7075 T651 on Corrosion and Mechanical Properties

Rendell

Hsiao

Shirokoff

2017

Advances in Materials Science and Engineering

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The corrosion resistance of aluminum 7075 T651 in full clad (Alclad), partial clad, and bare (unclad) forms was compared after 300 hours of corrosion exposure in an acidic salt spray cabinet test at 36 ∘ C. After corrosion exposure, severe to moderate exfoliation corrosion was observed on the unprotected medium sized test panel, light general corrosion was observed on the partially clad panel, and patches of corrosion not penetrating the clad layer were observed on the fully clad panel. After corrosion tests, the tensile strength of partially clad, fully clad, and unprotected panels decreased by 3.4%, 4.0%, and 5.3%, respectively.

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Tolerable corrosion damage on aircraft aluminum structures: Local cladding patterns

Cited by 7 publications

References 19 publications

Effect of environment's aggressiveness on the corrosion damage evolution and mechanical behavior of AA 2024‐T3

Effect of environment's aggressiveness on the corrosion damage evolution and mechanical behavior of AA 2024‐T3

Numerical Simulation of Tensile Behavior of Corroded Aluminum Alloy 2024 T3 Considering the Hydrogen Embrittlement

Effect of Partial Cladding Pattern of Aluminum 7075 T651 on Corrosion and Mechanical Properties

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