Enhancement in sustained friction and wear resistance of nanoporous aluminum oxide films obtained by controlled electrochemical oxidation process

The primary purpose of this study is to investigate the effect of the electrochemical parameters required in the anodic oxidation process on the friction and wear resistance of the obtained nanoporous aluminum oxide films.

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Effects of NaOH Concentration on Section Structures of Oxide Films Based on TC4 by Anodic Oxidation Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.645-646.303 ◽

2015 ◽

Vol 645-646 ◽

pp. 303-312

Author(s):

Ji Kang Yan ◽

Gang Yang ◽

Zhe Shi ◽

Wan Xia Tang ◽

Yun Feng Wu

Keyword(s):

Crystal Structure ◽

Oxide Film ◽

Anodic Oxidation ◽

Film Growth ◽

Oxidation Process ◽

Oxide Films ◽

Amorphous State ◽

Oxygen Atmosphere ◽

Section Structure ◽

Anodic Oxidation Process

The section structure and growth mechanism of oxide films on titanium alloys Ti-6Al-4V (TC4) in the oxalate, silicate and phosphate hybrid electrolyte system by anodic oxidation method were investigated. Using TC4 as anodic, stainless steel as cathode, oxide films on the surface of TC4 titanium alloy were prepared by anodic oxidation process. X-ray diffract meter, spiral-micrometer, eddy current thickness meter and scanning electron microscope were used to measure the crystal structure, thickness, microstructure and chemical composition of the film . The experimental results indicate that NaOH concentration has almost no effects on the crystal structure of oxide films which are amorphous state. The oxide films on TC4 grow through three stages. At anodic oxidation primary stage, a thicker TiO2 films on TC4 are able to form due to an abundant oxygen atmosphere. At anodic oxidation middle stage, a middle TiO1.5 films form due to a not enough oxygen atmosphere. At anodic oxidation latest stage, a thin TiO1.5 films form due to a heavily insufficient oxygen atmosphere. With NaOH concentration increasing, the ingrowth velocity (VOA) of the interface between TC4 and oxide film is faster than dissolution rate (VAD) of the surface oxide film resulting in a slight oxide film growth. The thickness of oxide film no longer varies when VOA is equal to VAD.

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Effect of Surface Oxide Films of Aluminum on Anodic Oxidation Process in Organic Electrolytes

Journal of The Surface Finishing Society of Japan ◽

10.4139/sfj.61.330 ◽

2010 ◽

Vol 61 (4) ◽

pp. 330-333

Author(s):

Ikue KANEKO ◽

Masaaki YAGINUMA ◽

Junichi ENDO ◽

Kazuhiro TACHIBANA ◽

Takashi ENDO ◽

...

Keyword(s):

Anodic Oxidation ◽

Oxidation Process ◽

Oxide Films ◽

Surface Oxide ◽

Organic Electrolytes ◽

Anodic Oxidation Process ◽

Effect Of Surface

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Determining Optimum Anodic Oxidation Parameters for Hardness and Wear Properties of AA7075-T6 Alloys Using Taguchi Design

Brilliant Engineering ◽

10.36937/ben.2021.001.003 ◽

2020 ◽

Vol 2 (1) ◽

pp. 10-18

Author(s):

Yaşar SERT

Keyword(s):

Wear Resistance ◽

Oxide Layer ◽

Anodic Oxidation ◽

Process Parameters ◽

Oxidation Process ◽

Wear Properties ◽

Anova Analysis ◽

Aa 7075 ◽

Oxidation Parameters ◽

Anodic Oxidation Process

In this study, the main goal is to determine the effects of the variable anodic oxidation process parameters on the hardness and wear properties of the AA7075-T6 alloy, which is widely used in the gun industry, automotive, aircraft, and space industry. Samples obtained using the process parameters designed by the Taguchi method were subjected to various experiments and the findings obtained from these experiments were compared with S/N graphs determined using ANOVA analysis. As a result of these findings, it was determined that different coating thickness, hardness and wear resistance were obtained by varying the anodic oxidation process parameters. The highest oxide layer thickness obtained was determined as 70.63 µm. In addition, the oxide layer formed by the anodic oxidation process has significantly increased the hardness and wear resistance of the AA 7075-T6 alloy. Also, as a result of the experiments and ANOVA analysis, it was determined that the oxide layer obtained with the parameters of 22V constant voltage, 1.3A/dm2 current density, 2°C temperature, 140 minutes of processing time will have the superior wear performance.

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A Comparative Analysis of 2-(Thiocyanomethylthio)-Benzothiazole Degradation Using Electro-Fenton and Anodic Oxidation on a Boron-Doped Diamond Electrode

International Journal of Photoenergy ◽

10.1155/2018/5290975 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9

Author(s):

Armando Vázquez ◽

Lucía Alvarado ◽

Isabel Lázaro ◽

Roel Cruz ◽

José Luis Nava ◽

...

Keyword(s):

Anodic Oxidation ◽

Oxidation Process ◽

Volumetric Flow Rate ◽

Boron Doped Diamond ◽

Aquatic Life ◽

Diamond Electrode ◽

Boron Doped ◽

Boron Doped Diamond Electrode ◽

Acidic Chloride ◽

Anodic Oxidation Process

2-(Thiocyanomethylthio)-benzothiazole (TCMTB) is used as fungicide in the paper, tannery, paint, and coatings industries, and its study is important as it is considered toxic to aquatic life. In this study, a comparison of direct anodic oxidation (AO) using a boron-doped diamond electrode (BDD) and electro-Fenton (EF) processes for TCMTB degradation in acidic chloride and sulfate media using a FM01-LC reactor was performed. The results of the electrolysis processes studied in the FM01-LC reactor showed a higher degradation of TCMTB with the anodic oxidation process than with the electro-Fenton process, reaching 81% degradation for the former process versus 47% degradation for the latter process. This difference was attributed to the decrease in H2O2 during the EF process, due to parallel oxidation of chlorides. The degradation rate and current efficiency increased as a function of volumetric flow rate, indicating that convection promotes anodic oxidation and electro-Fenton processes. The results showed that both AO and EF processes could be useful strategies for TCMTB toxicity reduction in wastewaters.

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Downscaled anodic oxidation process for aluminium in oxalic acid

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/181/1/012044 ◽

2017 ◽

Vol 181 ◽

pp. 012044 ◽

Cited By ~ 2

Author(s):

M Sieber ◽

R Morgenstern ◽

D Kuhn ◽

M Hackert-Oschätzchen ◽

A Schubert ◽

...

Keyword(s):

Oxalic Acid ◽

Anodic Oxidation ◽

Oxidation Process ◽

Anodic Oxidation Process

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Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium

Coatings ◽

10.3390/coatings9010057 ◽

2019 ◽

Vol 9 (1) ◽

pp. 57 ◽

Cited By ~ 4

Author(s):

Miroslav Gombár ◽

Alena Vagaská ◽

Marta Harničárová ◽

Jan Valíček ◽

Milena Kušnerová ◽

...

Keyword(s):

Surface Layer ◽

Layer Thickness ◽

Anodic Oxidation ◽

Current Practice ◽

Oxidation Process ◽

Influence Factors ◽

Basic Criterion ◽

Electrolysis Method ◽

Current Densities ◽

Anodic Oxidation Process

The current practice in the field of anodic oxidation of aluminium and its alloys is based mainly on a set of partial empirical experiences of technologists obtained during surface treatment. The aim of the presented paper is deeper and more complex identification of the influence of chemical and technological factors acting during the anodic oxidation process especially on the thickness of the formed surface layer by the electrolysis method in a sulfuric acid solution. The current density was selected as the basic criterion for verification evaluation and analysis of experimentally obtained data, in accordance with Faraday’s laws. For current densities of 1 to 5 A·dm−2, the synergy of significant influence factors was identified, and mathematical and statistical models were then developed to predict the thickness of the surface layer with a relative accuracy of up to 10%. The presented paper does not only focus on the observation of the thickness of the surface layer desired by the customer, but also on the monitoring of this thickness in relation to the overall layer thickness of the coating.

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