Galvanic Corrosion Performance of an Al–BN Abradable Seal Coating System in Chloride Solution

Lei, Bing; Peng, Mingxiao; Liu, Ling; Hu, Shengnan; Zhang, Wei; Meng, Guozhe

doi:10.3390/coatings11010009

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…Once corrosive mediums reach Al/coating interface, corrosion reactions occur on the aluminium substrate, leading to a complete destruction of the protective performance of the WPU coating. In addition, a specific corrosion phenomenon of Al and its alloys is the increase of cathodic hydrogen evolution rate under anodic polarization of the electrode resulting from the combined effects of the local pH drop and the passive film breakdown, which is often referred to as the "negative difference effect" (NDE), [18][19][20] meaning it is contrary to the prediction in electrochemical theory that the hydrogen evolution rate should decrease with increasing anodic polarization. 21 The presence of H 2 gas at the metal/coating interface poses a significant challenge to coating adhesion and ultimately results in the rapid failure of the WPU coating.…”

Section: Introductionmentioning

confidence: 93%

A new strategy to improve the anticorrosion performance of waterborne polyurethane coating on AA7075

Lei,

Li,

Liu

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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In this study, Ce3+ functionalised halloysite nanotubes (HNTs) were prepared, and their impact on the anticorrosion properties of waterborne polyurethane (WPU) coating on 7075 aluminium alloy (AA7075) was investigated. HNTs were grafted by 3-aminopropyltriethoxysilane (APTES) to enhance Ce3+ loading, which was confirmed by X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectrum. The release behaviour of Ce3+ from HNTs was tested by inductively coupled plasma optical emission spectrometry (ICP-OES), and the inhibition effect of Ce3+-loaded HNTs for AA7075 was tested by polarization plots. The anticorrosion property of WPU doped with Ce3+-loaded HNTs was investigated by electrochemical impedance spectroscopy (EIS) and pull-off adhesion test. The results showed that APTES modification improved the Ce3+ loading amount on HNTs, and Ce3+ acts as an effective cathodic inhibitor for AA7075. After soaking for 40 days, the |Z|0.01Hz of Ce-HNTs/WPU was two orders of magnitude higher than that of pure WPU, while wet put-off adhesion was higher than pure WPU.

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Section: Introductionmentioning

confidence: 93%

A new strategy to improve the anticorrosion performance of waterborne polyurethane coating on AA7075

Lei,

Li,

Liu

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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“…Meanwhile, annealing at 600 °C enhanced the Rct slightly but lowered the Rf. The presence of an inductive loop presented by an inductance Lf in the equivalent circuit is mainly associated with the phenomena of species absorption such as intermediate corrosion products, metallic chloride, hydrated metal hydroxides, and chemical species such as chloride ions [24], but it can also be associated with partial anodic dissolution [24], as well as the film breakdown due to corrosion [25]. This trend can be described according to the following reactions: After being immersion for 24 h in 3 wt% NaCl solution at 30 °C with pH 4, the FE-SEM images showed that all specimen surfaces had been corroded, and part of the surface layer had been dissolved (figures 10(a)-(g)).…”

Section: Corrosion Behaviormentioning

confidence: 99%

Effect of microstructural rearrangement as a result of annealing on the corrosion behavior of 7075 aluminum alloy

Anawati,

Aliyah,

Tanji

et al. 2023

Mater. Res. Express

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Understanding of the relationship between microstructural change and corrosion behavior is essential for achieving the optimum benefit of strengthening precipitates in providing high strength without sacrificing the corrosion resistance of 7000 series aluminum alloys. This work aims at revealing the relationship between the microstructural rearrangement and corrosion behavior of a 7075 series aluminum alloy as a result of annealing at the temperature range of 300 – 600 °C. Microstructural observation indicated a gradual dissolution of Cu in the solid solution matrix with increasing annealing temperature. At 600 °C, a formation of segregated Al2Cu phase occurred along the grain boundaries. After subjected to corrosion tests, exfoliation corrosion was observed on the as-received specimen, as well as on the specimens annealed at 300, 400 and 500 °C, whilst an intergranular corrosion occurred on that annealed at 600 °C. The corrosion resistance was higher on the specimen annealed at 500 °C compared those annealed at other temperatures, as the result of Cu enrichment the solid solution matrix.

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“…It was found that the corrosion resistance was remarkably improved by WC compared to the base alloy [ 19 ]. The Al-BN system was also tested in a chloride solution to evaluate the galvanic corrosion performance [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Developing Improved Corrosion-Resistant AA5083—BN/WC Composites for Tribological Applications

et al. 2023

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In this study, corrosion-resistant AA5083—BN/WC composites were developed for tribological applications through adequate control of the reinforcement content (WC and BN) in the matrix (AA5083 alloy). The effects of 6% and 12% tungsten carbide (WC) as well as 6% and 12% boron nitride (BN) additions on the corrosion behavior of AA5083 aluminum composite in 3.5% NaCl solution were carried out. Electrochemical techniques such as cyclic potentiodynamic polarization (CPP), changes in the chronoamperometric current with time (CCT), and electrochemical impedance spectroscopy (EIS) were utilized. The polarization results showed that the addition of 6% WC to the AA5083 alloy matrix improved its resistance to corrosion (RP). Rp exhibited an additional increase by adding 12% WC to the matrix. The values of RP were observed to increase for the AA5083 composite when adding 6% BN, and the highest RP values were recorded for the composite that contains 12% BN. The results obtained by the CPP method were confirmed by CCT and EIS measurements, where the presence of WC and BN protected the developed AA5083- BN/WC composites against corrosion. The corrosion resistance revealed an additional improvement with an increase in WC and BN content from 6% to 12%. The results also confirm that pitting corrosion decreased in the presence of WC and BN in the fabricated composites.

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Galvanic Corrosion Performance of an Al–BN Abradable Seal Coating System in Chloride Solution

Cited by 8 publications

References 28 publications

A new strategy to improve the anticorrosion performance of waterborne polyurethane coating on AA7075

A new strategy to improve the anticorrosion performance of waterborne polyurethane coating on AA7075

Effect of microstructural rearrangement as a result of annealing on the corrosion behavior of 7075 aluminum alloy

Developing Improved Corrosion-Resistant AA5083—BN/WC Composites for Tribological Applications

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