Optimization of Surface Properties of Plasma Electrolytic Oxidation Coating by Organic Additives: A Review

Kaseem, Mosab; Dikici, Burak

doi:10.3390/coatings11040374

Cited by 29 publications

(7 citation statements)

References 114 publications

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“…Further, they adsorb on the electrode and significantly reduce the anode/electrolyte interface tension [ 66 , 187 ], modulating gas evolution and the discharge population density [ 185 , 187 ]. All these effects can affect the mechanism of the discharge and change the structure of PEO coatings, reduce the surface porosity, inhibit defect development and improve the corrosion resistance [ 188 ]. The detailed effects of organic and inorganic additives are presented in Table 4 .…”

Section: Effect Of Energy Input and Electrolyte Composition On Coatin...mentioning

confidence: 99%

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: Part II—PEO and Anodizing

et al. 2022

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Although hexavalent chromium-based protection systems are effective and their long-term performance is well understood, they can no longer be used due to their proven Cr(VI) toxicity and carcinogenic effect. The search for alternative protection technologies for Mg alloys has been going on for at least a couple of decades. However, surface treatment systems with equivalent efficacies to that of Cr(VI)-based ones have only begun to emerge much more recently. It is still proving challenging to find sufficiently protective replacements for Cr(VI) that do not give rise to safety concerns related to corrosion, especially in terms of fulfilling the requirements of the transportation industry. Additionally, in overcoming these obstacles, the advantages of newly introduced technologies have to include not only health safety but also need to be balanced against their added cost, as well as being environmentally friendly and simple to implement and maintain. Anodizing, especially when carried out above the breakdown potential (technology known as Plasma Electrolytic Oxidation (PEO)) is an electrochemical oxidation process which has been recognized as one of the most effective methods to significantly improve the corrosion resistance of Mg and its alloys by forming a protective ceramic-like layer on their surface that isolates the base material from aggressive environmental agents. Part II of this review summarizes developments in and future outlooks for Mg anodizing, including traditional chromium-based processes and newly developed chromium-free alternatives, such as PEO technology and the use of organic electrolytes. This work provides an overview of processing parameters such as electrolyte composition and additives, voltage/current regimes, and post-treatment sealing strategies that influence the corrosion performance of the coatings. This large variability of the fabrication conditions makes it possible to obtain Cr-free products that meet the industrial requirements for performance, as expected from traditional Cr-based technologies.

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Section: Effect Of Energy Input and Electrolyte Composition On Coatin...mentioning

confidence: 99%

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: Part II—PEO and Anodizing

et al. 2022

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“…Among these factors, the chemical composition of the electrolytes significantly impacts the electrochemical characteristics of the oxide layers generated via MAO. Nevertheless, a prevalent challenge in the production of MAO coatings arises from the use of environmentally harmful or toxic additives such as fluoride, aluminate, 1,3,5,7-Tetraazaadamantane, and Quinolin-8-ol [9]. The challenge at hand is, thus, to innovate new electrolyte systems that employ eco-friendly additives, paving the way for the creation of high-performance coatings.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Surface Properties of TiO2-Based Coatings via Stevia-Assisted Spark Suppression: Insights from Density Functional Theory Calculations

Kaseem,

Safira,

Fattah-alhosseini

2024

Inorganics

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This study investigates the enhancement of surface properties in TiO2-based coatings on the Ti-6Al-4V alloy through micro-arc oxidation (MAO), employing stevia sugar as a novel additive. By incorporating stevia sugar into acetate–glycerophosphate–tetraethoxysilane solutions used in MAO treatment, the porous morphology of TiO2-based oxide layers is regulated. The incorporation of stevia moderates plasma discharge intensity, facilitating the formation of a uniform silicon-rich structure characterized by reduced porosity and pore size. This effect is attributed to the interaction between stevia and tetraethyl orthosilicate (TEOS), which modifies the TEOS hydrolysis process, thereby enhancing structural uniformity and stability while concurrently reducing plasma discharge intensity. Additionally, theoretical calculations offer a valuable understanding of the reactivity and interactions of stevia, TEOS, and their complex during the MAO process, laying the groundwork for further research and optimization in this promising field.

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“…Organic additives are usually added into the electrolyte to alter the characteristics of micro-discharges. Suitable organic additives in specific electrolyte could effectively suppress the strong arcs which are destructive to the PEO coatings, thus optimized morphology and enhanced properties could be obtained [36]. Another effective method to improve the coating properties is to fabricate composite coatings with multifunction.…”

Section: Introductionmentioning

confidence: 99%

Research Progress on the Wear and Corrosion Resistant Plasma Electrolytic Oxidation Composite Coatings on Magnesium and Its Alloys

Zhao

Wang

et al. 2023

Coatings

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Plasma electrolytic oxidation (PEO), as a cost effective and environmentally friendly technology, has been applied on magnesium and its alloys to improve wear and corrosion resistance. Additionally, combining with particles addition in the electrolyte and/or various post-treatments could diminish the intrinsic structural defects of the PEO coatings and provide multifunctionalities, including wear resistance, corrosion resistance, self-lubrication, and self-healing. This paper reviews recent progress on PEO composite coatings prepared by in situ incorporation of functional particles and/or post-treatments on magnesium and its alloys. The focus is given to the microstructural and functional changes of the PEO coatings, particularly on the wear and corrosion behaviors.

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Optimization of Surface Properties of Plasma Electrolytic Oxidation Coating by Organic Additives: A Review

Cited by 29 publications

References 114 publications

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: Part II—PEO and Anodizing

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: Part II—PEO and Anodizing

Enhanced Surface Properties of TiO2-Based Coatings via Stevia-Assisted Spark Suppression: Insights from Density Functional Theory Calculations

Research Progress on the Wear and Corrosion Resistant Plasma Electrolytic Oxidation Composite Coatings on Magnesium and Its Alloys

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