Plasma electrolytic oxidation of binary Mg-Al and Mg-Zn alloys

Gündüz, K.O.; Oter, Zafer Cagatay; Tarakçı, Mehmet

doi:10.1016/j.surfcoat.2016.08.040

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…Based on the results of both electrochemical methods performed to assess the corrosion resistance of PEO, the coating positively influenced the surface's ability to withstand the supply of reactive Cl − ions. Significant improvement of corrosion properties by creating PEO coating on magnesium alloy AZ91 also confirms other works [52][53][54][55]. The presence of intermetallic compounds, including the compound (Mg 17 Al 12 ) in the α-phase in the microstructure of AZ91 magnesium alloy, has a significant influence during the evolution of the PEO process itself, and consequently on the chemical composition and the resulting corrosion resistance of the formed oxidic coating [55][56][57].…”

Section: Discussionsupporting

confidence: 79%

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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Section: Discussionsupporting

confidence: 79%

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 addition, the research shows that the oxidation of magnesium oxide alloy powder can be prevented [ 22 , 23 ]. For example, in Mg–Be and Mg–Al alloys, active metal elements added to the alloy are required to react before Mg elements, so as to prevent large-scale oxidation of Mg elements [ 24 , 25 , 26 , 27 ]. Therefore, Mg Al, AZ (Mg–Al–Zn), ZK (Mg–Zn-Zr), AM (Mg–Al–Mn) and WE (Mg–Re) series are the most commonly used alloy systems in SLM process [ 23 , 28 , 29 ].…”

Section: Fabrication Of Magnesium Alloy With Selective Laser Meltingmentioning

confidence: 99%

Selective Laser Melted Magnesium Alloys: Fabrication, Microstructure and Property

et al. 2022

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As the lightest metal structural material, magnesium and its alloys have the characteristics of low density, high specific strength and good biocompatibility, which gives magnesium alloys broad application prospects in fields of biomedicine, transportation, and aerospace. Laser selective melting technology has the advantages of manufacturing complex structural parts, high precision and high degree of freedom. However, due to some disadvantages of magnesium alloy, such as low boiling point and high vapor pressure, the application of it in laser selective melting was relatively undeveloped compared with other alloys. In this paper, the fabrication, microstructure, mechanical performance and corrosion resistance property of magnesium alloys were summarized, and the potential applications and the development direction of selective laser melting magnesium alloys in the future are prospected.

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“…Therefore, focusing on reducing and limiting the growth of this layer becomes a vital key to enhancing the performance of the PEO process. The formed film depends on the application of post-treatments and PEO conditions [28], specifically the electrolyte composition [29][30][31][32][33] and the electrical parameters [34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Improving the Corrosion Behavior of Biodegradable AM60 Alloy through Plasma Electrolytic Oxidation

Alateyah

Aljohani

Alawad

et al. 2021

Metals

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Magnesium (Mg) alloys have unique properties. However, their applications are limited in working environments due to their poor corrosion resistance. Plasma electrolytic oxidation (PEO) is one of the most environmentally friendly and cost-effective ways that has been promoted to treat Mg alloys. In this study, we investigated the effect of electrical parameters on the microstructure, as well as the mechanical and corrosion resistance of AM60 alloy coated with PEO. The electrical parameters studied were current mode (unipolar and bipolar), frequency and duty ratio. The microstructure evolution of the coated AM60 substrates was studied using X-ray diffraction and scanning electron microscopy. Subsequently, the mechanical properties were determined using compression tests and microhardness measurements. The potentiodynamic polarization curves indicated that the PEO-coated samples experienced a significant decrease of 99.9% in the corrosion rate compared to the base metal. The electrochemical impedance spectroscopy findings showed that PEO coating increased the corrosion resistance of the AM60 magnesium alloy by 1071870% compared to the base metal. On the other hand, the PEO coated samples showed superior adhesion to the substrate. Moreover, the PEO coating led to an improvement in the hardness value by 114% compared to base metal, coupled with insignificant change in the compressive properties.

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Plasma electrolytic oxidation of binary Mg-Al and Mg-Zn alloys

Cited by 15 publications

References 18 publications

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

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

Selective Laser Melted Magnesium Alloys: Fabrication, Microstructure and Property

Improving the Corrosion Behavior of Biodegradable AM60 Alloy through Plasma Electrolytic Oxidation

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