Effects of constituent particles and sensitization on surface spreading of intergranular corrosion on a sensitized AA5083 alloy

Jain, Swati; Hudson, J. L.; Scully, John R.

doi:10.1016/j.electacta.2013.06.036

Cited by 45 publications

(17 citation statements)

References 31 publications

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“…Studies [33,34] Moreover, the amount of the β-phase, as well as the proximity of these β-phase precipitates along a boundary path, aids the progression of IGC. [30,33,38] IGC spreading studies also observed a decrease in β-phase spacing for the LS and ST surfaces in comparison to the LS surface. [39] The IGC propagation through these discontinuous anodic path is dependent on the length of α-matrix or the β-phase precipitate spacing that has to be corroded through.…”

Section: Limitations Of the Modelmentioning

confidence: 84%

“…Additionally, precipitation of β-phase also occur near constituent particles. [14,29,77] Jain, et al [38] found that microgalvanic coupling between cathodic constituent particles and the alloy increases the initial dissolution probability of the β-phase precipitates present around the constituent particles. Therefore, β-phase precipitates and constituent particles distribution studies are necessary to facilitate better microstructure representation of the sensitized alloys.…”

Section: Limitations Of the Modelmentioning

confidence: 99%

“…[1,4,6,14,15] Although these alloys are designated as marine grade aluminum alloys, during service these alloys can become susceptible to intergranular corrosion (IGC) and intergranular stress corrosion cracking (IGSCC) in marine environments although DoS has a significant effect on the IGC depth, the properties of the electrolyte film, as dictated by the salt loading density and the RH, also affect the IGC propagation kinetics. The former model only covered IGC spreading, [38,39] and did not include the transition to IGSCC or failure by IGC penetration.…”

Section: Introductionmentioning

confidence: 99%

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Model to predict intergranular corrosion propagation in three dimensions in AA5083-H131

et al. 2016

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A three-dimensional (3-D) granular model that has the capability of predicting time-dependent intergranular corrosion (IGC) damage propagation depths in AA5083-H131 exposed to 0.6 M NaCl solution under potential control is presented. The geometry of grains and degree of sensitization (DoS) of grain boundaries were utilized as inputs, organized in a database, which informed the model to produce IGC depth distributions. The dependencies of IGC depth with exposure time, DoS, and orientation of propagation, both in terms of propagation kinetics and damage morphology, are outputs from the model. The model was calibrated by comparing outputted damage depths to IGC depth data from experiments. Model validation was achieved by comparing the predicted to experimental IGC depths based on image analyses of metallographic cross-section of AA5083-H131 exposed under the same conditions. The relevance and limitations of the current version of the model are discussed.

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Section: Limitations Of the Modelmentioning

confidence: 84%

Section: Limitations Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Model to predict intergranular corrosion propagation in three dimensions in AA5083-H131

et al. 2016

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“…Due to the high Mg content of these phases, they can induce aluminium alloys to corrode; however, other parameters such as the distribution, size and population density of the Mg‐rich particles along grain boundaries can also have a large influence on the corrosion performance of the alloy . In fact, their effect on the degree of sensitization can be more prominent than the concentration in Mg .…”

Section: Introductionmentioning

confidence: 99%

In‐service sensitization of a microstructurally heterogeneous AA5083 alloy

Wei

González

Hashimoto

et al. 2015

Materials & Corrosion

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It was revealed that an AA5083 alloy had been severely sensitized after 40 years in service at ground atmosphere temperature.The degree of sensitization of the various regions through the alloy plate thickness is different, which is associated with the non-uniform distribution of Mg through the plate thickness. The alloy plate exhibits Mg-rich bands that promoted the heterogeneous distribution of Mg-containing precipitates. The composition of these precipitates ranges from that for low Mg content intermetallics to that of the b 0 phase. Structure characterization revealed the b 0 phase and a cubic Al-Mg phase that has lower magnesium contents compared to the b phase.

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“…In recent decades, aluminum alloys (Al alloys) have been widely applied in engineering fields due to excellent physical, chemical, and mechanical properties 1 2 . Especially for the field of naval architecture and ocean engineering, Al alloys are pervasively used for plate and shell components, welding components, vessel equipments, and some other structural parts 3 .…”

mentioning

confidence: 99%

Multifunctional substrate of Al alloy based on general hierarchical micro/nanostructures: superamphiphobicity and enhanced corrosion resistance

Tian

Liu

et al. 2016

Sci Rep

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Aluminum alloys are vulnerable to penetrating and peeling failures in seawater and preparing a barrier coating to isolate the substrate from corrosive medium is an effective anticorrosion method. Inspired by the lotus leaves effect, a wetting alloy surface with enhanced anticorrosion behavior has been prepared via etch, deposition, and low-surface-energy modification. Results indicate that excellent superamphiphobicity has been achieved after the modification of the constructed hierarchical labyrinth-like microstructures and dendritic nanostructures. The as-prepared surface is also found with good chemical stability and mechanical durability. Furthermore, superior anticorrosion behaviors of the resultant samples in seawater are investigated by electrochemical measurements. Due to trapped air in micro/nanostructures, the newly presented solid-air-liquid contacting interface can help to resist the seawater penetration by greatly reducing the interface interaction between corrosive ions and the superamphiphobic surface. Finally, an optimized two-layer perceptron artificial neural network is set up to model and predict the cause-and-effect relationship between preparation conditions and the anticorrosion parameters. This work provides a great potential to extend the applications of aluminum alloys especially in marine engineering fields.

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Effects of constituent particles and sensitization on surface spreading of intergranular corrosion on a sensitized AA5083 alloy

Cited by 45 publications

References 31 publications

Model to predict intergranular corrosion propagation in three dimensions in AA5083-H131

Model to predict intergranular corrosion propagation in three dimensions in AA5083-H131

In‐service sensitization of a microstructurally heterogeneous AA5083 alloy

Multifunctional substrate of Al alloy based on general hierarchical micro/nanostructures: superamphiphobicity and enhanced corrosion resistance

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