Wear and Galvanic Corrosion Protection of Mg alloy via Plasma Electrolytic Oxidation Process for Mg Engine Application

Zhang, P.; Nie, Xueyuan; Hu, Henry

doi:10.4271/2009-01-0790

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…This provides substitution of a few components that can now be subjected to the PEO process, especially on Al alloys which will lead to the lessening of fuel consumption from automobile and aerospace industries. Enhanced coating performance obtained from the PEO process has been employed to manufacture machine parts related to the aerospace, automobile, gas, and oil industries [ 203 ]. The inside components of a spacecraft are coated with flat absorber coatings for optimum radiation purposes.…”

Section: Applications Of Peomentioning

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: Applications Of Peomentioning

confidence: 99%

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

et al. 2021

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“…Another field of application of PEO is biomedical engineering, such as the production of osseo-integrative coatings for orthopaedic and dental implants. This is mainly because the implant materials have to meet certain requirements, such as biocompatibility (hemocompatibility, cytocompatibility), non-toxicity, chemical stability and corrosion resistance [21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Plasma Electrolytic Oxidation on the Short-Term Corrosion Behaviour of AZ91 Magnesium Alloy in Aggressive Chloride Environment

et al. 2022

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In order to increase the corrosion resistance of magnesium alloy AZ91 in corrosion environments containing chlorides, the alloy surface has been modified by plasma electrolytic oxidation (PEO). The chemical composition of electrolyte in the PEO process consisted of 12 g/L Na3PO4·12 H2O and 1 g/L KOH, and a direct current was applied to the sample. The corrosion resistance of PEO coating and as-cast AZ91 (sample without PEO coating) was assessed using two different electrochemical methods: electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation (PDP) in 0.1 M NaCl at laboratory temperature. In addition to the electrochemical methods, the morphology of the oxidic coating was observed in the cross-sectional and top surface view by using the SEM technique. For better determination of the microstructure and PEO coating, chemical composition EDX analysis was used. The results of the experiments show that the formation of the PEO coating on AZ91 alloy has a more positive effect on the corrosion resistance in 0.1 M NaCl based on electrochemical methods than in the case of the formed coating on AZ31 alloy from the previous study. Based on electrochemical measurements in the selected environment, the formation of PEO coating on AZ91 was accompanied by a significant increase in polarisation resistance after short-term exposure compared to the as-cast surface. The EIS results showed a 73 times higher Rp value for PEO coated AZ91 when compared to the as-cast AZ91. Correspondingly, a 27 times lower icorr value was observed for PEO coated AZ91 than in the case of substrate AZ91 in 0.1 M NaCl. At the same time, the typically porous and inhomogeneous structure of the formed PEO coating on the magnesium alloy AZ91 was demonstrated.

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“…Mechanical Applications (hardness, wear and friction): Due to the high hardness and superior tribological performance of the oxide layer formed by PEO process, which for example reduces the wear rate of 6061 Al alloy by a factor of about 30 [21] compared to 2 times for the hard anodized coating, allows a replacement of many parts by PEO coated Mg and Al alloys leading to a reduction in fuel consumption in the automotive and aerospace industries. Improved coating performance that can be obtained has yielded applications for PEO technology in the aerospace industry (fasteners, landing gear, blades, discs and shafts of aircraft engines), the automotive industry (seat frames, doors, pistons and cylinder liners), and the gas and oil industries (gears and rotary pumps) [22].…”

Section: Peo Applicationsmentioning

confidence: 99%

Production of Anti-Corrosion Coatings on Light Alloys (Al, Mg, Ti) by Plasma-Electrolytic Oxidation (PEO)

Hussein¹,

Northwood²

2014

Developments in Corrosion Protection

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Voltage and current density High Low Deposition rate Fast (1~2μm/min) Slow (~0.3μm/min) Oxidation mechanism Chemical/ electrochemical and plasma chemical reactions Chemical/electrochemical reactions Coating on selected alloys Practical for various kinds of Al, Mg and Ti alloys Limited (not used for 2000-series alloys, high zinc or silicon Al alloys and Al casting alloys) Microstructure Amorphous and crystalline phase / Inner dense layer and outer porous layer Amorphous / Columnar porous layer and very thin barrier Corrosion resistance (Relative) Excellent (5) Good (1) Hardness High (~Hv1600) Low (Hv600 max) Wear resistance (relative) Excellent (30) Fair (2) Thermal protection Excellent Good Electrolyte Alkaline solution Acid solution Dielectric strength Excellent Fair

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Wear and Galvanic Corrosion Protection of Mg alloy via Plasma Electrolytic Oxidation Process for Mg Engine Application

Cited by 5 publications

References 21 publications

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

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

Effect of Plasma Electrolytic Oxidation on the Short-Term Corrosion Behaviour of AZ91 Magnesium Alloy in Aggressive Chloride Environment

Production of Anti-Corrosion Coatings on Light Alloys (Al, Mg, Ti) by Plasma-Electrolytic Oxidation (PEO)

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