Corrosion behavior of a self-sealing pore micro-arc oxidation film on AM60 magnesium alloy

Dong, Kaihui; Song, Yingwei; Shan, Dayong; Han, En‐Hou

doi:10.1016/j.corsci.2015.08.004

Cited by 80 publications

(36 citation statements)

References 35 publications

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“…added graphene oxide into the electrolyte and found that the number of pores on the PEO coating was significantly decreased 22 . Moreover, some researchers tried to fabricate self-sealing PEO coating on Mg alloys 9 , 10 , 13 . Dong et al .…”

Section: Introductionmentioning

confidence: 99%

Sealing the Pores of PEO Coating with Mg-Al Layered Double Hydroxide: Enhanced Corrosion Resistance, Cytocompatibility and Drug Delivery Ability

Peng

Wang

Tian

et al. 2017

Sci Rep

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In recent years, magnesium (Mg) alloys show a promising application in clinic as degradable biomaterials. Nevertheless, the poor corrosion resistance of Mg alloys is the main obstacle to their clinical application. Here we successfully seal the pores of plasma electrolytic oxidation (PEO) coating on AZ31 with Mg-Al layered double hydroxide (LDH) via hydrothermal treatment. PEO/LDH composite coating possess a two layer structure, an inner layer made up of PEO coating (~5 μm) and an outer layer of Mg-Al LDH (~2 μm). Electrochemical and hydrogen evolution tests suggest preferable corrosion resistance of the PEO/LDH coating. Cytotoxicity, cell adhesion, live/dead staining and proliferation data of rat bone marrow stem cells (rBMSCs) demonstrate that PEO/LDH coating remarkably enhance the cytocompatibility of the substrate, indicating a potential application in orthopedic surgeries. In addition, hemolysis rate (HR) test shows that the HR value of PEO/LDH coating is 1.10 ± 0.47%, fulfilling the request of clinical application. More importantly, the structure of Mg-Al LDH on the top of PEO coating shows excellent drug delivery ability.

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Section: Introductionmentioning

confidence: 99%

Sealing the Pores of PEO Coating with Mg-Al Layered Double Hydroxide: Enhanced Corrosion Resistance, Cytocompatibility and Drug Delivery Ability

Peng

Wang

Tian

et al. 2017

Sci Rep

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“…Therefore, only one EEC can be observed. components of impedance increased gradually after 1 h of exposure ( Figure 4a) attributed to the treatment [53]. The AC sample exhibits a smaller magnitude semi-circle compared to treated coating owing to the presence of defects on the surface (Figures 1a and 2a) which allows the ingress of the NaCl solution through the defects and causes a localized attack.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…Figure 4 shows the complex-plane impedance plots of the coatings at different exposure periods in 3.5 wt.% NaCl solution. As the concentration of NaH 2 PO 4 increased with 0.1 M Ca(NO 3 ) 2 , the magnitude of the real and imaginary components of impedance increased gradually after 1 h of exposure ( Figure 4a) attributed to the treatment [53]. The AC sample exhibits a smaller magnitude semi-circle compared to treated coating owing to the presence of defects on the surface (Figures 1a and 2a) which allows the ingress of the NaCl solution through the defects and causes a localized attack.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

et al. 2020

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Aluminum coating was deposited by arc thermal spraying process onto the steel substrate for the corrosion protection in aggressive environment. However, the arc thermal sprayed coating possesses defects in the coating. Thus, it is important to reduce the defects and enhance the corrosion resistance properties of the deposited coating using post-treatment. In the present study, we have used different concentrations of sodium phosphate mono basic (NaH2PO4) with 0.1 molar (M) calcium nitrate [Ca(NO3)2] as post-treatment solution to fill out the defects of the Al coating. It was observed by scanning electron microscopy (SEM) that 1 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample exhibited 71% reduction in defects compared to as coated samples. X-ray diffraction (XRD) was performed to determine the phases formed on the coating surface after treatments. XRD confirms the formation of sodium aluminum hydrogen phosphate (Na3Al(OH)(HPO4)(PO4)) and brushite (Ca(HPO4)(H2O)2) as composite oxides on the Al coating. Electrochemical results show that 0.5 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample has exhibited the highest charge transfer resistance and the lowest corrosion current density after 89 days of exposure in 3.5 wt.% NaCl solution. The enhancement in corrosion resistance of 0.5 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample attributed to the formation of adherent, sparingly soluble, and stable corrosion products. The volume fraction result of the corrosion products formed on 0.5 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample after 89 days of exposure in 3.5 wt.% NaCl using XRD confirms the highest amount of Bayerite (α-Al(OH)3) deposition, thus, the corrosion rate of this sample was the lowest.

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“…The anti-corrosion properties of K2ZrF6 were attributed to the activating surface of the substrate by the K2ZrF6 additives. Serval other authors have previously carried out experiments using K2ZrF6 in order to understand the properties and significance of the K2ZrF6 additives in primary step coatings [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effect of K2ZrF6 Concentration on the Two-Step PEO Coating Prepared on AZ91 Mg Alloy in Alkaline Silicate Solution

2020

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In this study, a two-step Plasma Electrolytic Oxidation (PEO) method with constant primary step parameters and varying K2ZrF6 concentration in the secondary electrolyte solution was carried out to obtain a hard and dense coating on AZ91D alloy. For lower concentrations of K2ZrF6, a mixture of granular and pancake structure with higher surface porosity was obtained. Increasing the concentration up to 6 g/L caused the granular structure to disappear and a significant decrease was observed in the surface porosity as well as inner layer damage. Due to the compact inner layer structure, significant improvement in the corrosion resistance and mechanical properties of the AZ91 was observed with K2ZrF6 concentration. Highest values of hardness and corrosion resistance, i.e., 1589.45 HV and 386.30 × 103 Ω cm2, respectively, were obtained for a 6 g/L K2ZrF6 concentration.

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Corrosion behavior of a self-sealing pore micro-arc oxidation film on AM60 magnesium alloy

Cited by 80 publications

References 35 publications

Sealing the Pores of PEO Coating with Mg-Al Layered Double Hydroxide: Enhanced Corrosion Resistance, Cytocompatibility and Drug Delivery Ability

Sealing the Pores of PEO Coating with Mg-Al Layered Double Hydroxide: Enhanced Corrosion Resistance, Cytocompatibility and Drug Delivery Ability

Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

Effect of K2ZrF6 Concentration on the Two-Step PEO Coating Prepared on AZ91 Mg Alloy in Alkaline Silicate Solution

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