Corrosion studies of plasma modified magnesium alloy in simulated body fluid (SBF) solutions

Tiyyagura, Hanuma Reddy; Puliyalil, Harinarayanan; Filipič, Gregor; Kumar, K. Chaitanya; Pottathara, Yasir Beeran; Rudolf, Rebeka; Fuchs–Godec, Regina; Mohan, M.; Cvelbar, Uroš

doi:10.1016/j.surfcoat.2020.125434

Cited by 18 publications

(31 citation statements)

References 31 publications

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“…Figure S2 shows the E − t curves of the bare, nitrided, and coated AZ91 Mg alloy in SBF. The initial potentials are −1743, −1819, and −1,602 mV, respectively, and with increasing immersion time, the potentials of the AZ91 Mg and nitrided AZ91 Mg shift to the positive direction due to gradual deposition of corrosion products such as MgO and Mg(OH) 2 (Mg corrosion reaction shown in Equation (1)) 5,6,30,31 :

Mg + {2H}_{2} normalO \to Mg {(OH)}_{2} + H_{2}

…”

Section: Discussionmentioning

confidence: 99%

“…To study the mechanism and corrosion behavior of the coating, an electrical equivalent circuit model is constructed to simulate the electrochemical cell 30‐37 . The electrical equivalent circuit models for the bare, nitrided AZ91 Mg alloy, and coated AZ91 Mg alloy are shown in Figure S3 and the results are summarized in Tables 1 and 2.…”

Section: Discussionmentioning

confidence: 99%

“…The different shape of the polarization curve of the coated specimens at 48 and 120 hr indicates a higher corrosion current density after 48 hr compared to 120 hr. According to Mg corrosion reaction shown in Equation (1), hydrogen gas emission may cause fluctuations in the anodic branch 30,31 …”

Section: Discussionmentioning

confidence: 99%

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Enhanced corrosion resistance and reduced cytotoxicity of the AZ91 Mg alloy by plasma nitriding and a hierarchical structure composed of ciprofloxacin‐loaded polymeric multilayers and calcium phosphate coating

Shanaghi

Mehrjou

Chu

2021

J Biomedical Materials Res

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Much effort has made to lessen the cytotoxicity and enhance the corrosion resistance of biodegradable magnesium alloys, for example, by depositing multilayered polymeric coatings containing hydroxyapatite. In this work, a hierarchical structure composed of ciprofloxacin (Cip)‐loaded on polyacrylic acid (PAA) and poly (ethyleneimine) (PEI) as biocompatible polymeric multilayers and calcium phosphate coating as the top layer is formed by the sol–gel method on the AZ91 Mg alloy with an intermediate layer formed by nitrogen plasma immersion ion implantation. The thicknesses of the multilayered coating and nitrided layer (Mg3N2) are 10 μm and 140 nm, respectively. The corrosion current density decreases by 95.6% and the corrosion potential in the polarization curve shifts to the positive direction by 23%. The passivation process which occurs at defects by deposition of corrosion products mitigates both galvanic and localized corrosion. Slight increase in the contact angle and surface free energy, enhanced corrosion resistance, and reduced cytotoxicity are observed from the multilayered structure. The better corrosion resistance enables better control of release of Cip. Biological assessment indicates that the antibacterial activity against Escherichia coli is improved by 100% after culturing for 24 hr and the cell viability and noncytotoxic behavior of the coated AZ91 are enhanced as well. The corrosion behavior and biological results suggest that the strategy of using a hierarchical structure composed of Cip‐loaded polymeric multilayers in conjunction with an intermediate plasma nitrided layer has large potential in the development of biodegradable orthopedic implants made of Mg alloys.

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Mg + {2H}_{2} normalO \to Mg {(OH)}_{2} + H_{2}

…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Enhanced corrosion resistance and reduced cytotoxicity of the AZ91 Mg alloy by plasma nitriding and a hierarchical structure composed of ciprofloxacin‐loaded polymeric multilayers and calcium phosphate coating

Shanaghi

Mehrjou

Chu

2021

J Biomedical Materials Res

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“…The reinforcing effect of the dopant is assumed to be a result of the developed microstructure and the 117 crystalline phases formed after sintering. Magnesium is a body-friendly material with an essential role in the human body [4], for instance at reducing risks of cardiovascular diseases, promoting catalytic reactions, controlling biological functions, and in the mineralization of calcined tissues. Approximately 60 to 70% of total body's Mg-content is in the skeleton, as substitution ion in HA lattice.…”

Section: Introductionmentioning

confidence: 99%

“…Approximately 60 to 70% of total body's Mg-content is in the skeleton, as substitution ion in HA lattice. Approximately 0.38 wt% of cattle bone is Mg [4]. Mg 2+ ions seemingly affect the conductivity of osteoclasts and osteoblasts [5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of composites of bovine derived hydroxyapatite (BHA) reinforced with MgF2

Şengör

2021

International Journal of Advances in Engineering and Pure Sciences

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Composites of calcinated bovine bone derived hydroxyapatite (BHA) doped 1 and 2 wt% MgF2 were prepared by a sintering process. Microstructure and crystallographic analyses along with measurements of density, compression strength, and microhardness were carried out in the produced samples. The experimental results indicated a beneficial effect of MgF2 in the matrix of BHA reflected in the significant increase of compression strength and microhardness up to 143 MPa and 313 HV, respectively, achieved after sintering at 1300 0 C for 2% MgF2 addition. The presence of MgF2 reduced the onset of sintering towards lower temperatures (i.e. 1100 0 C) and increased the stability of hydroxyapatite towards transformation to TCP at 1300 0 C. The influence of Mg 2+ and Fions in the lattice of hydroxyapatite is discussed.

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Hybrid Plasma Activation Strategy for the Protein‐Coated Magnesium Implants in Orthopedic Applications

Fang

Zhou

et al. 2022

Adv Materials Inter

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properties, corrosion resistance, and especially biocompatibility. Recently, silk fibroin (i.e., SF), a natural protein extracted from Bombyx mori silkworms, has been expected to be a coating strategy that protects of magnesium from corrosion for a long time. [10][11][12][13][14] This biological protein was similar to the collagen components in bone with osteogenic activity, which can endow inorganic Mg with osteoinductivity and osteoconductivity functions as a protective organic coating. However, the surface pretreatment process is essential in the application of biodegradable magnesium alloys, aiming to improve the adhesion force (or bonding strength) between organic protein coatings and inorganic magnesium substrates. [15] Thus, strong bonding at the interface can reinforce the anticorrosion performance of the coated structure in an immersed body fluid environment as well as the biocompatibility.Popular surface pretreatment includes chemical conversion, [16,17] microarc oxidation (MAO), [18,19] and intermediate layers, [20,21] which leads to some concerns regarding reliability or biosafety with increasing reports of clinical trials. The chemical conversion method applies alkaline or acid solutions on magnesium surfaces to form magnesium hydroxide [22] or magnesium fluoride, [23] which is simple and inexpensive. A single chemical conversion layer cannot provide long-term protection yet, and the biosafety of fluorine in vivo needs further confirmation. Although MAO is one of the most widely commercialized surface treatment technologies for magnesium, coatings are usually brittle with holes. Some materials such as poly dopamine [24] or 3-amino-propyltriethoxysilane (APTES, reported by our previous work) [25] are considered intermediate layers to generate bonds between outer coatings and magnesium substrates. However, their biodegradable behaviors are not controlled, and the biocompatibility of APTES is not clear. Generally, all the surface pretreatment technologies above provide one or more intermediate layers between coatings and substrates to improve adhesion at the bonding interfaces. [26][27][28][29] Some problems, including chemical residue, surface contamination, interface cracking probability, uncontrollable degradation, and biocompatibility are potential dangers when making use of intermediate layers, which form two or more bonding interfaces. [30][31][32][33] Biodegradable magnesium alloys show superior potential as bone repair implants, which are coated by natural polymers such as biological proteins to reinforce anticorrosion and biocompatibility. Surface pretreatment can facilitate the adhesion force of the organic coating/inorganic metal interface, but potentially causes one or more unfavorable intermediate layers. Herein, hybrid plasma activation is introduced to modify magnesium alloy (MgZnCa), which is directly coated by a natural protein, silk fibroin (i.e., SF), thus achieving a protein/magnesium direct bonding interface. Different plasmas exhibit distinctive physical and chemical performances o...

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Corrosion studies of plasma modified magnesium alloy in simulated body fluid (SBF) solutions

Cited by 18 publications

References 31 publications

Enhanced corrosion resistance and reduced cytotoxicity of the AZ91 Mg alloy by plasma nitriding and a hierarchical structure composed of ciprofloxacin‐loaded polymeric multilayers and calcium phosphate coating

Enhanced corrosion resistance and reduced cytotoxicity of the AZ91 Mg alloy by plasma nitriding and a hierarchical structure composed of ciprofloxacin‐loaded polymeric multilayers and calcium phosphate coating

Microstructure and mechanical properties of composites of bovine derived hydroxyapatite (BHA) reinforced with MgF2

Hybrid Plasma Activation Strategy for the Protein‐Coated Magnesium Implants in Orthopedic Applications

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