Long-Term Atmospheric Corrosion of Aluminum Alloy 2024-T4 in a Coastal Environment

Zhang, Teng; He, Yuting; Cui, Ronghong; An, Tao

doi:10.1007/s11665-015-1541-y

Cited by 19 publications

(6 citation statements)

References 30 publications

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“…The estimated thickness of the epoxy coating exposed for 7 years is 39.5 μm, as calculated by Equation (7). This means there is a 95% probability that the coating thickness will be over 39.5 μm in more than 99.9% of the regions after 7 years of exposure [ 27 ]. Figure 7 shows the average remaining thickness and the remaining thickness with 99.9% reliability and 95% confidence level of epoxy coatings in the macroscopically intact coating area on the test section of the specimens exposed for different times.…”

Section: Resultsmentioning

confidence: 99%

Long-Term Atmospheric Corrosion Behavior of Epoxy Prime Coated Aluminum Alloy 7075-T6 in Coastal Environment

Zhang

et al. 2018

Materials

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The atmospheric corrosion of epoxy prime coated aluminum alloy 7075-T6 exposed for 7, 12 and 20 years was investigated. The remaining thicknesses of epoxy prime coatings for macroscopically intact coating areas followed a normal distribution and decreased linearly. EIS results demonstrated that the corrosion resistance of the coating decreased with exposure time. After 20 years of exposure, the epoxy coating had lost its protection as cracks existed within the coating and exfoliation corrosion had occurred on the substrate. The substrate was sensitive to exfoliation corrosion through metallographic and TEM analysis. The corrosion products were mainly hydroxides of aluminum. The morphology and chemical compositions of the coating bubbling area and propagation characterizations of exfoliation corrosion were analyzed by SEM, EPMA and EDS. Cracks between the lumps of corrosion products provided the channels for the transmission of corrosion mediums. Furthermore, the mechanical model was proposed to analyze the propagation characterization of exfoliation corrosion.

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Section: Resultsmentioning

confidence: 99%

Long-Term Atmospheric Corrosion Behavior of Epoxy Prime Coated Aluminum Alloy 7075-T6 in Coastal Environment

Zhang

et al. 2018

Materials

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“…For many traditional metallic materials, their fatigue life data usually obey to logarithm-normal 21,22 or threeparameter (3P) Weibull distribution. 23,24 However, the damage and failure caused by fatigue loading are more complex than metallic materials.…”

Section: Introductionmentioning

confidence: 99%

T-T fatigue behaviors of composite T800/MTM46 cross-ply laminateand reliability analysis onfatigue life

Feng

Gao

2017

Advances in Mechanical Engineering

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Static and tension-tension fatigue experiments were conducted on T800/MTM46 cross-ply composite laminates. Fatigue limit and residual strength of the survival specimens were determined. Failure modes of static specimens are characterized by brittle fracture. However, failure modes of fatigue specimens are dominated by delamination, which tends to be more serious under low stress levels. Stiffness degradation can be presented by four stages, which is different from the previous researches. Matrix-dominated damage initiates first in the exterior plies especially in exterior 90°plies. Then, various types of damage appear in interior plies when damage in exterior plies has been very serious. Fatigue life data distribution was determined. Reliability fatigue life incorporating both reliability and confidence level was calculated using the single-side allowance factor. p-g-S-N curve/surface was proposed to predict reliability fatigue life under various reliability and confidence levels.

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“…Numerous corrosion tests in natural environment are conducted for aluminum alloys, e.g. 2024 aluminum alloy, over very long periods of time ranging from a few years 17,18 to several decades [19][20][21][22][23] in different environments: coastal, 17,23 urban, 19,20 industrial, 19,20 and rural. 19 Analyses of the corrosion products by X-ray diffraction (XRD) and scanning electron microscope combined with energy dispersive spectroscopy (SEM/EDS), [18][19][20]22,23 as well as monitoring of the mass loss as a function of exposure time [17][18][19][20] are often carried out.…”

mentioning

confidence: 99%

“…2024 aluminum alloy, over very long periods of time ranging from a few years 17,18 to several decades [19][20][21][22][23] in different environments: coastal, 17,23 urban, 19,20 industrial, 19,20 and rural. 19 Analyses of the corrosion products by X-ray diffraction (XRD) and scanning electron microscope combined with energy dispersive spectroscopy (SEM/EDS), [18][19][20]22,23 as well as monitoring of the mass loss as a function of exposure time [17][18][19][20] are often carried out. SEM and optical microscope (OM) observations of the surface allowed the type of corrosion to be identified [17][18][19][20]22,23 with sometimes the determination of the percentage of corroded area.…”

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confidence: 99%

Comparative Study of Techniques and Methods Used to Characterize Intergranular Corrosion in AA2024 Aluminum Alloy

Mondou,

Duployer,

Tenailleau

et al. 2023

J. Electrochem. Soc.

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Three methodologies, i.e., optical microscope (OM) observations, analyses using tomography without synchrotron radiations, and mechanical tests, were used, and their relevancy compared to provide a quantitative description of the intergranular corrosion (IGC) damage. The study was performed on three plates of 2024 aluminum alloy, to take into account variations in the microstructure of the material, using two types of exposure conditions, i.e. continuous immersions and cyclic tests. The resolution of tomography was too low to allow an analysis at the scale of the elementary IGC defects. For thin plates with recrystallized grains, the corrosion damage corresponded mostly to intragranular corrosion, and OM observations were the most relevant technique to quantify correctly this damage. Thicker plates were mainly affected by IGC. Continuous immersion tests led to slightly branched IGC defects and low hydrogen uptake, and OM observations provided an accurate description of the IGC damage that corresponded mainly to a geometrical one. However, combining OM observations and mechanical tests was required for a full description of the IGC damage after cyclic tests that were associated with a strong branching of the IGC defects, i.e. geometrical damage, and significant hydrogen uptake, i.e., a non-negligible volume damage.

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Long-Term Atmospheric Corrosion of Aluminum Alloy 2024-T4 in a Coastal Environment

Cited by 19 publications

References 30 publications

Long-Term Atmospheric Corrosion Behavior of Epoxy Prime Coated Aluminum Alloy 7075-T6 in Coastal Environment

Long-Term Atmospheric Corrosion Behavior of Epoxy Prime Coated Aluminum Alloy 7075-T6 in Coastal Environment

T-T fatigue behaviors of composite T800/MTM46 cross-ply laminateand reliability analysis onfatigue life

Comparative Study of Techniques and Methods Used to Characterize Intergranular Corrosion in AA2024 Aluminum Alloy

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