Effect of Process Parameters on the Corrosion Resistance Properties of PEO Coatings Produced on AZ31B Magnesium Alloy

Savguira, Yuri; Ni, Qing; Sobrinho, P.H.; North, T. H.; Thorpe, Steven J.

doi:10.1149/07217.0091ecst

Cited by 7 publications

(5 citation statements)

References 41 publications

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“…PEO process is impacted by different parameters such as nature of substrate material, electrolyte constituents, the density of the current, type of current, voltage, frequency, duty cycle, additives, particles incorporated, coating time, and operational temperature [ 3 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. Although this process has been widely used for materials such as aluminum and its alloys [ 50 , 52 , 53 , 54 , 55 ], and magnesium and its alloys [ 56 , 57 , 58 , 59 , 60 ], the focus of more recent research on PEO coatings are oriented towards other valve metals like titanium [ 61 , 62 , 63 , 64 , 65 ], tantalum [ 66 , 67 , 68 , 69 , 70 ], zirconium [ 71 , 72 , 73 , 74 , 75 ], and niobium and all their different alloys [ 76 , 77 , 78 , 79 , 80 ].…”

Section: Introductionmentioning

confidence: 99%

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

et al. 2021

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Plasma electrolytic oxidation (PEO) is a novel surface treatment process to produce thick, dense metal oxide coatings, especially on light metals, primarily to improve their wear and corrosion resistance. The coating manufactured from the PEO process is relatively superior to normal anodic oxidation. It is widely employed in the fields of mechanical, petrochemical, and biomedical industries, to name a few. Several investigations have been carried out to study the coating performance developed through the PEO process in the past. This review attempts to summarize and explain some of the fundamental aspects of the PEO process, mechanism of coating formation, the processing conditions that impact the process, the main characteristics of the process, the microstructures evolved in the coating, the mechanical and tribological properties of the coating, and the influence of environmental conditions on the coating process. Recently, the PEO process has also been employed to produce nanocomposite coatings by incorporating nanoparticles in the electrolyte. This review also narrates some of the recent developments in the field of nanocomposite coatings with examples and their applications. Additionally, some of the applications of the PEO coatings have been demonstrated. Moreover, the significance of the PEO process, its current trends, and its scope of future work are highlighted.

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Section: Introductionmentioning

confidence: 99%

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

et al. 2021

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“…Savguira et al used this technique to study the consequence of process parameters such as the oxidation time, applied current density, and electrolyte temperature on the corrosion properties of PEO coatings. [ 97 ]…”

Section: Understanding Eis Of Peo Coatingsmentioning

confidence: 99%

A Review on the Application‐Focused Assessment of Plasma Electrolytic Oxidation (PEO) Coatings Using Electrochemical Impedance Spectroscopy

Dilimon

Shibli

2023

Adv Eng Mater

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Background of this ReviewPlasma electrolytic oxidation (PEO), micro-arc oxidation, and micro-plasma oxidation are alternative names for the same surfacecoating technology for producing multiple layers of ceramic oxides on the surface of light valve metals such as Al, Mg, Ti, Zr, Ta, Nb, Hf, and their alloys. Oxidation potentials higher than the dielectric breakdown voltage of the first formed passive film are applied through a suitable electrolyte. This high applied potential (400-600 V or higher) generates plasma discharges on the workpiece metal surface, and this plasma creates ideal conditions of high temperatures and pressures for the formation of hardened, crystalline, well-adherent, and corrosion-resistant oxide layers.The PEO process has several benefits over the conventional electrolytic oxidation process. Surface coatings formed through the PEO process have two to four times higher hardness. Their unique porous outer layer permits material scientists and engineers to customize the coating performance by incorporating different reagents, particles, and functionalities. The coating thickness can be varied from a few micrometers to more than 100 μm depending on the final target application of PEO coatings. The chemical passivity and inertness of PEO coatings enable their application in harsh environments. Reduced stiffness and crack-free edges of PEO coatings give better adhesion, making them suitable for applications under mechanical strain or thermal cycling. Also, PEO coatings technology is used for making biodegradable orthopedic implants. [1,2] PEO process with nontoxic electrolytes is an environmentally friendly technology. Qin et al. reported the preparation method of degradation resistant and in vitro cytocompatible PEO coatings on biomedical Mg alloys in green, nontoxic, and recyclable electrolytes. [3] Recent review papers describe the present status of PEO coating technology on different metals and alloys. [4][5][6][7][8][9] The last 20 years show a remarkable increase in publication numbers related to PEO coatings (Figure 1). Among them, the number of publications describing electrochemical impedance spectroscopy (EIS) for PEO coating analysis is also considerably increasing (Figure 1).The PEO coatings contain various oxides of base metals, additives, and electrolyte-borne species from the electrolyte. [10][11][12] Recent review papers describe in detail the effect of particle addition into the PEO coatings on the microstructure, composition, and corrosion behavior of coatings studied by different microscopic, spectroscopic, and electrochemical techniques. [13][14][15][16][17][18][19][20] Also, several recent research papers discuss the EIS assessment of particle-incorporated PEO coatings. [21][22][23] To a large extent, the inclusion of additives occurs in the PEO coating's outer layer, while the inner layer is mainly metal oxide of the substrate metal. [8] The size of incorporated particles in PEO coatings is in either nano or micro ranges. Recent review papers discuss the PEO coating's perfor...

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“…PEO is influenced by a wide variety of parameters such as nature of substrate materials, composition of electrolyte, current density, current mode, voltage, frequency, duty cycle, additives, coating time, and temperature . Substrate decides the nature of oxide layer such as adherence, biocompatibility, bioactivity, and tribological characteristics.…”

Section: Plasma Electrolytic Oxidationmentioning

confidence: 99%

“…Duty cycle, which is the ratio in percentage form between on‐duration in a pulse cycle to the total duration of cycle, exhibits a positive correlation with pore enlargement . Partial dissolution of PEO coatings occur at elevated temperature of electrolyte, resulting in thinner coatings …”

Section: Plasma Electrolytic Oxidationmentioning

confidence: 99%

Surface modification of valve metals using plasma electrolytic oxidation for antibacterial applications: A review

Rizwan

Alias

Zaidi

et al. 2017

J Biomedical Materials Res

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Plasma electrolytic oxidation (PEO) is an advance technique to develop porous oxidation layer on light metals, primarily to enhance corrosion and wear resistance. The oxidation layer can also offer a wide variety of mechanical, biomedical, tribological, and antibacterial properties through the incorporation of several ions and particles. Due to the increasing need of antimicrobial surfaces for biomedical implants, antibacterial PEO coatings have been developed through the incorporation of antibacterial agents. Metallic nanoparticles that have been employed most widely as antibacterial agents are reported to demonstrate serious health and environmental threats. To overcome the current limitations of these coatings, there is a significant need to develop antibacterial surfaces that are not harmful for patient's health and environment. Attention of the readers has been directed to utilize bioactive glasses as antibacterial agents for PEO coatings. Bioactive glasses are well known for their excellent bioactivity, biocompatibility, and antibacterial character. PEO coatings incorporated with bioactive glasses can provide environment-friendly antimicrobial surfaces with exceptional bioactivity, biocompatibility, and osseointegration. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 590-605, 2018.

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Effect of Process Parameters on the Corrosion Resistance Properties of PEO Coatings Produced on AZ31B Magnesium Alloy

Cited by 7 publications

References 41 publications

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

A Review on the Application‐Focused Assessment of Plasma Electrolytic Oxidation (PEO) Coatings Using Electrochemical Impedance Spectroscopy

Surface modification of valve metals using plasma electrolytic oxidation for antibacterial applications: A review

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