Effect of cerium ion on the microstructure and properties of permanganate conversion coating on LZ91 magnesium alloy

Jian, Shun-Yi; Chang, Ko-Lun

doi:10.1016/j.apsusc.2019.144767

Cited by 38 publications

(9 citation statements)

References 55 publications

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“…In most previous research related to the quantitative analysis of Mg alloy corrosion, the researchers focused on overall changes measured using mass loss rate (MLR, mg/mm 2 h) and electrochemical techniques on their specimens [ 14 , 15 , 16 ]. However, these methods cannot be used to analyze the regeneration of bone tissue in vivo.…”

Section: Introductionmentioning

confidence: 99%

The Potential of Calcium/Phosphate Containing MAO Implanted in Bone Tissue Regeneration and Biological Characteristics

Jian

Aktuğ

Huang

et al. 2021

IJMS

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Micro arc oxidation (MAO) is a prominent surface treatment to form bioceramic coating layers with beneficial physical, chemical, and biological properties on the metal substrates for biomaterial applications. In this study, MAO treatment has been performed to modify the surface characteristics of AZ31 Mg alloy to enhance the biocompatibility and corrosion resistance for implant applications by using an electrolytic mixture of Ca3(PO4)2 and C10H16N2O8 (EDTA) in the solutions. For this purpose, the calcium phosphate (Ca-P) containing thin film was successfully fabricated on the surface of the implant material. After in-vivo implantation into the rabbit bone for four weeks, the apparent growth of soft tissues and bone healing effects have been documented. The morphology, microstructure, chemical composition, and phase structures of the coating were identified by SEM, XPS, and XRD. The corrosion resistance of the coating was analyzed by polarization and salt spray test. The coatings consist of Ca-P compounds continuously have proliferation activity and show better corrosion resistance and lower roughness in comparison to mere MAO coated AZ31. The corrosion current density decreased to approximately 2.81 × 10−7 A/cm2 and roughness was reduced to 0.622 μm. Thus, based on the results, it was anticipated that the development of degradable materials and implants would be feasible using this method. This study aims to fabricate MAO coatings for orthopedic magnesium implants that can enhance bioactivity, biocompatibility, and prevent additional surgery and implant-related infections to be used in clinical applications.

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Section: Introductionmentioning

confidence: 99%

The Potential of Calcium/Phosphate Containing MAO Implanted in Bone Tissue Regeneration and Biological Characteristics

Jian

Aktuğ

Huang

et al. 2021

IJMS

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“…The Tafel extrapolation method was used to fit corrosion current densities ( i corr ) and potentials ( E corr ). After conversion treatment, the i corr values of the samples for anodic and cathodic branches were inhibited, while the E corr values increased . The shift in E corr toward the anodic direction suggested that the conversion coating functions as a physical barrier to prevent electrolyte penetration .…”

Section: Resultsmentioning

confidence: 99%

“…Due to the unique self-healing ability of the chromium-containing coating, it is considered the best conversion coating for corrosion prevention . However, chromium salts have been severely restricted due to their carcinogenicity to humans and Cr (VI)’s continuous contribution to environmental pollution . Over the past decades, studies on alternatives to chromate coating have led to the proliferation of phosphate, vanadium, phosphate-permanganate, stannate, hydrotalcite, rare earth, titanate, zirconium, phytic acid, and chitosan conversion coatings.…”

Section: Introductionmentioning

confidence: 99%

Novel Phosphate Conversion Coating with Superior Corrosion Resistance on the Mg-Al-RE Alloy Based on the Introduction of Silane

Zhang

Wang

2023

ACS Omega

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A novel chemical conversion method based on an aqueous electrolyte solution containing hydrolyzed silane as a crucial film-forming agent has been developed successfully. An organic/ inorganic composite coating with superior corrosion protection was fabricated on the Mg-Al-RE alloy. The micro-morphology and chemical composition of the coating were examined using scanning electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy. The prepared conversion coating possesses a doublelayer structure, with a dense bottom layer and a loose outer layer containing microcracks. In addition, the anti-corrosion capacity of various samples was evaluated using salt spray, hydrogen evolution, and electrochemical tests. The analysis revealed that the samples converted by 3-aminopropyl triethoxysilane (APTES)-phosphate solution possessed a higher corrosion resistance. Compared to the blank sample, a 2 orders of magnitude reduction in i corr (6.678 × 10 −7 A/cm 2 ) and a 1.360 V improvement in E corr were observed. The MPCC-Si sample exhibited the lowest hydrogen evolution rate, indicating the best corrosion protection. Also, the rust grade could still reach 7 after 72 h of the neutral salt spray test.

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“…EIS used a sinusoidal wave with an amplitude of 5 mV in a frequency range of 10 −2 Hz to 10 5 Hz. Prior to all electrochemical experiments (the potentiodynamic polarization test and EIS), the samples were immersed in the test solution to achieve a steady open circuit potential (OCP) for about 20 min [ 31 , 32 , 33 , 34 ].…”

Section: Methodsmentioning

confidence: 99%

The Effect of Oxalic Acid as the Pre-Activator for the Electropolishing of Additive Manufactured Titanium-Based Materials and Its Characterization

et al. 2022

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The use of additive manufactured (AM) titanium-based materials has increased substantially for medical implants and aerospace components. However, the inferior surface roughness of additive manufactured products affects the outward appearance and reduces performance. This study determines whether activation treatment prior to electropolishing produces a better surface. Oxalic acid (OA) is used as a pre-activator using different experimental conditions and the surface roughness is reduced by electropolishing with an electrolyte of perchloric acid and glacial acetic acid. The SEM surface morphology, mechanical properties, phase transformation and electrochemical properties are measured to determine the effect of different degrees of roughness on the surface. The results show that the surface roughness of AM titanium-based samples decreases from 8.47 µm to 1.09 µm after activation using OA as a pre-treatment for electropolishing. After electropolishing using optimal parameters, the hardness and resistance to corrosion resistance are increased.

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Effect of cerium ion on the microstructure and properties of permanganate conversion coating on LZ91 magnesium alloy

Cited by 38 publications

References 55 publications

The Potential of Calcium/Phosphate Containing MAO Implanted in Bone Tissue Regeneration and Biological Characteristics

The Potential of Calcium/Phosphate Containing MAO Implanted in Bone Tissue Regeneration and Biological Characteristics

Novel Phosphate Conversion Coating with Superior Corrosion Resistance on the Mg-Al-RE Alloy Based on the Introduction of Silane

The Effect of Oxalic Acid as the Pre-Activator for the Electropolishing of Additive Manufactured Titanium-Based Materials and Its Characterization

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