Coloration of the aluminum alloy surface with dye emulsions while growing a plasma electrolytic oxide layer

Yeh, Shang-Chun; Tsai, Dah–Shyang; Wang, Jian-Mao; Chou, Chen–Chia

doi:10.1016/j.surfcoat.2015.12.091

Cited by 22 publications

(10 citation statements)

References 20 publications

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“…However, the main components of the coating on weld zone (middle position) were α-Al 2 O 3 and γ-Al 2 O 3 since the middle position of welding area was mainly covered by dense basal layer and small amount of distributed island-shaped porous layer, as shown in Figure 5 b,e, thus the diffraction peak data obtained were mainly those of the dense basal layer. The XRD results were identical to the EDS analysis results in Figure 8 [ 24 ].…”

Section: Resultssupporting

confidence: 73%

The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory

et al. 2018

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Electrical connection of dissimilar metals will lead to galvanic corrosion. Therefore, overall surface treatment is necessary for the protection of dissimilar metal welded parts. However, serious unbalanced reactions may occur during overall surface treatment, which makes it difficult to prepare integral coating. In this paper, an overall ceramic coating was fabricated by plasma electrolytic oxidation to wrap the 6061–7075 welded part integrally. Moreover, the growth mechanism of the coating on different areas of the welded part was studied based on the dielectric breakdown theory. The reaction sequence of each area during the treatment was verified through specially designed dielectric breakdown tests. The results showed that the high impedance overall of ceramic coating can inhibit the galvanic corrosion of the 6061–7075 welded part effectively.

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Section: Resultssupporting

confidence: 73%

The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory

et al. 2018

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“…In electrochemical oxidations, the sample was mounted at the central position of the electrolytic solution, and the electrical current was sent by a direct current (DC) power supply (DCG-100A, ENI Emerson Electric Co., Saint Louis, MO, USA) with a pulse waveform generator (SPIK-2000A-10H, MELEC, GmbH, Shanghai, China). More details on the setup of anodization and PEO, Figure S1, along with the working procedure, Figure S2, can be found in Supplementary Materials and our previous publication [28].…”

Section: Methodsmentioning

confidence: 99%

Correlation between Defect Density and Corrosion Parameter of Electrochemically Oxidized Aluminum

2019

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It has been recognized that a connection may exist between defects of oxide coating and its corrosion protection. Such a link has not been substantiated. We prepare two coatings of anodized aluminum oxide (AAO) and plasma electrolytic oxidation (PEO), and analyze them with Mott-Schottky plots and potentiodynamic polarization scans. The as-grown and annealed AAO coatings exhibit both p-type and n-type semiconductor behaviors. Polarization resistance of the AAO coating increases from (1.8 ± 1.7) × 108 to (4.3 ± 0.5) × 108 Ω·cm2, while corrosion current decreases from (6.1 ± 3.6) × 10−7 to (2.3 ± 0.9) × 10−7 A·cm−2, as annealing temperature increases from room temperature to 400 °C. The parameter analysis on AAO indicates a positive correlation between corrosion current and donor density, a negative correlation between polarization resistance and donor density. The attempt on correlating corrosion potential gives rise to considerable deviation from a linear fit. The results suggest protection of AAO hinges on its donor density, not acceptor. On the PEO coatings, only the n-type behavior is observed. Intriguingly, the donor density of PEO coating is influenced by the annealing temperature of its pre-anodized layer. The most resistant PEO coating, with pre-anodized and 400 °C annealed AAO, exhibits polarization resistance (2.1 ± 0.4) × 109 Ω·cm2 and corrosion current (1.7 ± 0.4) × 10−8 A·cm−2.

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“…Pretreatment of the sample and the PEO setup had been described in the previous publication. 37 The pulsed current was regulated by a high-voltage power supply (GX-100/1000, ADL GmbH), with different electrical settings for the two growth steps. In the barrier layer growth, the controlled voltage settings were denoted as 400 V(+)/100 V(−), since the square voltage waveform was set 400 V in positive and 100 V in negative polarization.…”

Section: Methodsmentioning

confidence: 99%

Particle Size Influences on the Coating Microstructure through Green Chromia Inclusion in Plasma Electrolytic Oxidation

Liu

Tsai

Wang

et al. 2017

ACS Appl. Mater. Interfaces

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In an effort to color the aluminum alloy surface green via plasma electrolytic oxidation (PEO), two alkaline solutions have been employed with particulate inclusions and sodium aluminate. Electrolyte I comprises a self-made chromia pigment with a mean particle size 69 nm, whereas electrolyte II contains a commercially available pigment, GN-M, with a larger particle size 351 nm. Both pigments are oxygen deficient CrO of corundum-type structure before coating, the oxidative environment of PEO converts them into stoichiometric CrO. In electrolyte I and II, the oxides of chromium and aluminum deposit simultaneously under analogous PEO conditions, yet resulting in very different microstructures. The GN-M inclusion of large size amasses on top of the coating, while the self-made inclusion goes deep, and closely associates with alumina and pores. The oxide coating, grown in electrolyte II, consists of a top CrO-rich layer and a dense alumina layer underneath, delineated by the boundary marked with microdischarge burns. On the other hand, the self-made particulate inclusion appears to bring the electric microdischarges inside the coating and create inner pores and damages. The structure difference, caused by the difference in microdischarge locations, is attributed to shifting of the CrO-AlO interface where p-type and n-type semiconductors meet.

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Coloration of the aluminum alloy surface with dye emulsions while growing a plasma electrolytic oxide layer

Cited by 22 publications

References 20 publications

The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory

The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory

Correlation between Defect Density and Corrosion Parameter of Electrochemically Oxidized Aluminum

Particle Size Influences on the Coating Microstructure through Green Chromia Inclusion in Plasma Electrolytic Oxidation

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