Surface characterization of nanoporous aluminium oxide films synthesized by single-step DC and AC anodization

Chelliah, Nagaraj M.; Saxena, Alaukik; Sharma, Khushdeep; Singh, Harpreet; Surappa, M.K.

doi:10.1016/j.surfin.2017.04.001

Cited by 16 publications

(13 citation statements)

References 46 publications

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“…Pore sizes with a diameter ranging from 19.77 -45.84 nm were found on the anodized aluminum films. This finding is in good agreement with previous works [5,14]. The SEM images of anodized aluminum sheets are shown in Figure 4.…”

Section: Resultssupporting

confidence: 93%

“…The aluminum sheets had been cleaned with 1 M NaOH solution before they were washed with distilled water. In order to increase the pore size for improving the catalyst stabilization on the aluminum substrates, the anodization method was then applied [5]. The anodization was carried out using 18 M H 2 SO 4 solution as an electrolyte at a constant applied voltage of 50 V and 0.2 A for 25 min.…”

Section: Preparation Of Aluminum Sheetsmentioning

confidence: 99%

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Synthesis and Characterization of TTIP-Al Films and Fe3+/TTIP-Al Films to be Used in Photocatalytic Oxidation under Visible Light

Intawong

Dechapanya

Jawjit

2021

Walailak J Sci & Tech

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Currently, pressed-wood industries reuse the chemical solution in the wood conservation step by using a chlorine solution. However, this procedure is potentially harmful to workers due to the enormous amount of chlorine use. This research will offer more environmental and human health-friendly solutions to reuse the chemical solution in the process. In this research, the synthesis and characterization of the TTIP-Al films and the Fe3+/TTIP-Al films used in photocatalytic oxidation under visible light was studied. The synthesized films were used to study the COD and color removal of the chemical solution used in the pressed-wood process. To prepare the films, aluminum sheets were cleaned and anodized to increase the films' pore size and roughness for improving the catalyst stabilization on the aluminum substrates. Titanium isopropoxide (TTIP) was used to prepare the TiO2-Fe3+ solution in the sol-gel and dip-coating method. A total of 6 different catalyst dosages of films were synthesized. The morphology of aluminum sheets and the synthesized films were analyzed using SEM. Results revealed that anodization enhanced the pore size and roughness of the film surfaces. The analysis of XRD indicated that the crystal of Anatase TTIP at 25.5° 2 Theta was observed, in which the higher dosage of TTIP resulted in higher peak intensity. Results from the UV-VIS analysis suggested that absorbed wavelengths for Fe3+/TTIP-Al films shifted to visible light (410 nm) compared to those of TTIP-Al films (380 nm). FT-IR Spectra analysis of the Fe3+/TTIP-Al films showed the group of hydroxyl radicals on the Fe3+/TiO2 surface. This functional group could affect the efficiency of photocatalytic oxidation. Color and COD removal of the chemical solution in rubberwood pressed using these films in the annular photocatalytic reactor will be studied in the next phase of this work.

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Section: Resultssupporting

confidence: 93%

Section: Preparation Of Aluminum Sheetsmentioning

confidence: 99%

Synthesis and Characterization of TTIP-Al Films and Fe3+/TTIP-Al Films to be Used in Photocatalytic Oxidation under Visible Light

Intawong

Dechapanya

Jawjit

2021

Walailak J Sci & Tech

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“…Thus, the electroconvective model was consistent with the experimental evidence and provided theoretical support in a non-trivial situation (for alternating or pulsed current anodizing) where other models were limited in their explanatory abilities. Later, Chelliah et al compared morphologies of PAA laminas obtained in single-step DC and AC anodizing processes and discovered the evolution of localized flower-like structures on top of AC-generated PAA laminas, which could be also successfully explained by mechanism proposed by Pashchanka [149]. Chelliah et al have suggested an extension to the convective model in order to include into consideration the processes happening during the interruption of steady-state anodizing by polarity reversal (see Figure 27).…”

Section: Figure 24mentioning

confidence: 99%

“…Later, Chelliah et al compared morphologies of PAA laminas obtained in single-step DC and AC anodizing processes and discovered the evolution of localized flower-like structures on top of AC-generated PAA laminas, which could be also successfully explained by mechanism proposed by Pashchanka [ 149 ]. Chelliah et al have suggested an extension to the convective model in order to include into consideration the processes happening during the interruption of steady-state anodizing by polarity reversal (see Figure 27 ).…”

Section: Theoretical Models Explaining Paa Formationmentioning

confidence: 99%

Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces

Pashchanka

2021

Nanomaterials

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Over the past few years, researchers have made numerous breakthroughs in the field of aluminum anodizing and faced the problem of the lack of adequate theoretical models for the interpretation of some new experimental findings. For instance, spontaneously formed anodic alumina nanofibers and petal-like patterns, flower-like structures observed under AC anodizing conditions, and hierarchical pores whose diameters range from several nanometers to sub-millimeters could be explained neither by the classical field-assisted dissolution theory nor by the plastic flow model. In addition, difficulties arose in explaining the basic indicators of porous film growth, such as the nonlinear current–voltage characteristics of electrochemical cells or the evolution of hexagonal pore patterns at the early stages of anodizing experiments. Such a conceptual crisis resulted in new multidisciplinary investigations and the development of novel theoretical models, whose evolution is discussed at length in this review work. The particular focus of this paper is on the recently developed electroconvection-based theories that allowed making truly remarkable advances in understanding the porous anodic alumina formation process in the last 15 years. Some explanation of the synergy between electrode reactions and transport processes leading to self-organization is provided. Finally, future prospects for the synthesis of novel anodic architectures are discussed.

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“…Very meager information are available in literature about the corrosion behavior of aluminum alloys in Red Sea conditions [ 22 ]. The surface strength of aluminum alloys in terms of chemical stability has been improved by techniques such as anodization in which anodic oxidation gives rise to a stable oxide layer [ 23 , 24 ]. Chromating process involving introduction of hexavalent chromium as the alloying element in the surface by chemical processes [ 25 ] and rare earth material coating such as CeO 2 is employed by chemical methods to protect the surface from aggressive chemical attack [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Thermal and Mechanical Treatment to the Offshore Corrosion Behavior of 6351 Aluminum Alloy in Red Sea Environments

Fageehi

Rajasekaran

2020

International Journal of Analytical Chemistry

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This study investigates the effect of artificial aging treatment and mechanical attrition treatment on the corrosion behavior of 6351 Al alloy in Red Sea environment. The artificial aging of the alloy is carried out at temperature range 140°C–240°C in steps of 20°C for various time periods after the solution heat treatment at 530°C for 1 hour. Based on the hardness measurements, the aged specimens are categorized into three, namely, underaged, peak aged, and overaged. The as received alloy specimens are subjected to mechanical attrition treatment in a vacuum chamber using steel balls. Vickers hardness test reveals that there is a remarkable improvement in hardness of mechanical attrition treated specimens compared to that of aged specimens. The aged and mechanical attrition treated specimens were subjected to the corrosion test in Red Sea water using the Autolab instrument. The corrosion tests reveal that the peak-aged composite corrodes more in Red Sea water when compared to that of other groups of specimens. XRD measurements and SEM analysis are carried out to study the surface nature of attrition treated specimens. It is observed that the mechanical attrition treated specimens exhibit a nanocrystalline surface and lead to a decrease in corrosion resistance. However, the annealing of the alloy after attrition treatment optimizes the mechanical and corrosion properties of the alloy.

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Surface characterization of nanoporous aluminium oxide films synthesized by single-step DC and AC anodization

Cited by 16 publications

References 46 publications

Synthesis and Characterization of TTIP-Al Films and Fe3+/TTIP-Al Films to be Used in Photocatalytic Oxidation under Visible Light

Synthesis and Characterization of TTIP-Al Films and Fe3+/TTIP-Al Films to be Used in Photocatalytic Oxidation under Visible Light

Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces

Investigation on the Effect of Thermal and Mechanical Treatment to the Offshore Corrosion Behavior of 6351 Aluminum Alloy in Red Sea Environments

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