Modification of the structure and properties of oxide layers on aluminium alloys: A review

Korzekwa, Joanna

doi:10.1515/rams-2023-0108

Cited by 7 publications

(2 citation statements)

References 205 publications

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“…One of the most widely accepted Al 2 O 3 formation techniques is based on the electrochemical method [52]. Electrochemical oxidation (anodizing) is an electrolytic passivation process that contributes to an increase in the thickness of the natural oxide layer on the metal surface and enhances surface hardness, corrosion resistance, and other technical features [53].…”

Section: Electrochemical Methodsmentioning

confidence: 99%

Possibility of Phase Transformation of Al2O3 by a Laser: A Review

Matijošius,

Padgurskas,

Bikulčius

2024

Crystals

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Aluminum (Al) components of high quality often require an optimal ratio of lightness and favorable mechanical properties. In order to improve the physical-mechanical properties of Al, an aluminum oxide (Al2O3) film is usually formed on the surface of Al, which itself is characterized by high strength, hardness, corrosion resistance, and other technical properties. Unfortunately, depending on the conditions, the oxide film may be formed from different crystal phases on the Al surface, which are not always of desirable quality, i.e., the α-Al2O3 phase. The present review demonstrates that the properties of the Al2O3 film may be improved by Al processing with a laser beam according to the scheme: Al (Al alloy) → electrochemical anodizing → treatment with laser irradiation → α-Al2O3. Both Al substrate and the anodizing electrolyte affect the phase transformation of anodic Al2O3. Laser irradiation of the Al2O3 surface leads to high heating and cooling rates, which may promote the formation of a highly crystalline α-Al2O3 phase on anodic Al2O3.

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Section: Electrochemical Methodsmentioning

confidence: 99%

Possibility of Phase Transformation of Al2O3 by a Laser: A Review

Matijošius,

Padgurskas,

Bikulčius

2024

Crystals

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“…1,2 Aluminum and its alloys exposed to the air can naturally form an oxide layer, although the film layer is relatively dense; because of its very thin thickness, once the wear occurs, it cannot resist the corrosion damage to the matrix in the harsh environment. [3][4][5] Micro-arc oxidation (MAO) is a technology that prepares high-performance ceramic coatings on the surface of aluminum and its alloys. [6][7][8][9] After MAO process treatment, the wear resistance, 10,11 corrosion resistance, [12][13][14] mechanical strength, [15][16][17] optical application 18,19 of aluminum and its alloy surfaces have been significantly improved.…”

Section: Introductionmentioning

confidence: 99%

Effects of graphene content in alkaline silicate electrolyte on AA1060 pure aluminum micro‐arc oxidation coating

Li,

Jing,

Chen

et al. 2024

Int J Applied Ceramic Tech

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Ceramic coatings were obtained by micro‐arc oxidation (MAO) on the surface of AA1060 pure aluminum in alkaline silicate electrolyte with the addition of graphene. The effects of graphene contents in the range of 0–.30 g/L in the electrolyte on surface morphology, corrosion resistance, and wear resistance of the ceramic coatings were investigated. The outer surface structure, outer surface element content, coating cross‐section structure, coating cross‐section element content, coating/substrate interface structure, and coating phase were characterized by scanning electron microscope and X‐ray diffraction. Potentiodynamic polarization and electrochemical impedance spectroscopy were used to evaluate the corrosion behavior of MAO samples in a 3.5‐wt% NaCl solution. In addition, the resistance to sliding and abrasive wear of the oxide coating were studied experimentally. The results show that the alkaline silicate electrolyte with the addition of graphene has a significant effect on the characteristics of MAO coating. The performance of micro‐arc oxide coatings is best when the graphene content in the electrolyte is .15 g/L, the average thickness of the film is 7.24 μm, the average pore size is 6.07 μm, the impedance value is approximately 4.01 × 106 Ω, and its friction coefficient is .55.

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Eco‐friendly enhancement of mechanical properties in 3D carbon felt reinforced epoxy/aluminum sandwich composites via NaCl‐based anodizing and triton X‐100 modification

Taieh,

Fahad

2024

Polymer Composites

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To address the challenges of achieving strong adhesion between aluminum face sheets and composite cores (3D carbon felts) in sandwich structures, this work presents a novel approach that prioritizes safety, environmental sustainability, and ease of processing. The 3D CFs/Epoxy core was modified with Triton X‐100 in amounts from 0 to 10 wt% of the epoxy resin. The aluminum alloy face sheets were anodized at voltages from 0 to 11 V, using a NaCl‐based anodizing process. The technique of anodizing can enhance the bond between the aluminum face sheets and the 3D CFs/epoxy core, resulting in improved mechanical performance of the composite, including flexural and compressive testing, as well as dynamic mechanical analysis. The composite, embedding 3D CFs foam in epoxy resin, has a storage modulus 65.1% higher than pure epoxy at 2070 MPa. In addition, increasing Triton X‐100 content (1–10 wt%) decreases the storage modulus from 1886 to 1314 MPa and the glass transition temperature from 68.3 to 62.8 °C. Additionally, with Triton X‐100 concentrations of 1 to 10 wt%, the flexural modulus of the epoxy reinforced by 3D CFs drops from 3951.8 to 2400 MPa, and the flexural strength decreases by 55.3% from 174 to 112 MPa, indicating reduced structural rigidity. For sandwich composites with anodized aluminum face sheets, a 7 V anodizing voltage boosts the flexural modulus from 17.8 GPa (0 V) to 36.2 GPa. At 7 V, compressive strength and strain rise by 346.9% and 995.5%, respectively. Flexural toughness peaks at 11239 KJ/m3 with 5 wt% Triton X‐100.Highlights Developed new sandwich epoxy composites consisting of anodized aluminum sheet treated with NaCl and modified 3D carbon felts epoxy composites using Triton X‐100. Aluminum face sheets underwent an anodization at different voltages (0, 5, 7, 9, and 11 volts), aiming to enhance the bonding between the aluminum sheets and the 3D CFs/epoxy core. Triton X‐100 was utilized to modify the epoxy matrix at various concentrations (0 to 10 wt%) for improving the flexibility of the sandwich core. The sandwich composites incorporating the un‐anodized face sheet have shown flexural modulus of about 17.8 GPa. The modulus achieves its maximum value of 36.2 GPa when anodized at 7 V, indicating a 103% increase. The flexural strength of sandwich composites increases by 13% (272 MPa) when the Triton X‐100 concentration is raised to 5 wt%, compared to the 240 MPa flexural strength of the Al face sheet anodized at 7 V.

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Modification of the structure and properties of oxide layers on aluminium alloys: A review

Cited by 7 publications

References 205 publications

Possibility of Phase Transformation of Al2O3 by a Laser: A Review

Possibility of Phase Transformation of Al2O3 by a Laser: A Review

Effects of graphene content in alkaline silicate electrolyte on AA1060 pure aluminum micro‐arc oxidation coating

Eco‐friendly enhancement of mechanical properties in 3D carbon felt reinforced epoxy/aluminum sandwich composites via NaCl‐based anodizing and triton X‐100 modification

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