Improving Corrosion Resistance and Biocompatibility of Magnesium Alloy by Sodium Hydroxide and Hydrofluoric Acid Treatments

Pan, Changjiang; Pang, Li-Qun; Hou, Yu; Lin, Yue; Gong, Tao; Liu, Tao; Ye, Wei; Ding, Hongyan

doi:10.3390/app7010033

Cited by 30 publications

(15 citation statements)

References 39 publications

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“…Moreover, the Cl − ion in the solution can decompose the Mg(OH) 2 film and convert it into soluble magnesium chloride (MgCl 2 ). Therefore, Mg(OH) 2 coating as a physical barrier can successfully separate the Mg substrate from an aqueous solution or physiological environment, but is not sufficient to endow Mg alloys with long-term corrosion resistance [ 109 ]. Mg(OH) 2 film is often used as an inner layer for augmenting the adhesion between the Mg substrate and the outer layer.…”

Section: Surface Modification Of Mg Alloy Stentsmentioning

confidence: 99%

“… Mg–Zn TiO 2 0.400 SBF −1.70 −1.65 1050 49.0 23.99 1.119 14 TiO 2 film had a low HR (1%) and inhibited platelet adhesion and promoted ECs attachment [ 91 ]. AZ31B Mg(OH) 2 – SBF −1.57 −1.174 37.26 2.052 0.851 0.046 7 MgF 2 coating had relatively better corrosion resistance than Mg(OH) 2 coating, however, Mg(OH) 2 coating showed better anti-thrombosis and cytocompatibility to ECs than MgF 2 coating [ 109 ]. MgF 2 −1.128 0.6821 0.015 JDBM Mg 3 (PO 4 ) 2 3.5 Artificial plasma −1.74 −1.63 1.59 1.08 0.036 0.024 – The prepared phosphate coating improved the corrosion resistance and biological response.…”

Section: Surface Modification Of Mg Alloy Stentsmentioning

confidence: 99%

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Advances in coatings on magnesium alloys for cardiovascular stents – A review

Zhang

Yang

et al. 2021

Bioactive Materials

109

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Magnesium (Mg) and its alloys, as potential biodegradable materials, have drawn wide attention in the cardiovascular stent field because of their appropriate mechanical properties and biocompatibility. Nevertheless, the occurrence of thrombosis, inflammation, and restenosis of implanted Mg alloy stents caused by their poor corrosion resistance and insufficient endothelialization restrains their anticipated clinical applications. Numerous surface treatment tactics have mainly striven to modify the Mg alloy for inhibiting its degradation rate and enduing it with biological functionality. This review focuses on highlighting and summarizing the latest research progress in functionalized coatings on Mg alloys for cardiovascular stents over the last decade, regarding preparation strategies for metal oxide, metal hydroxide, inorganic nonmetallic, polymer, and their composite coatings; and the performance of these strategies in regulating degradation behavior and biofunction. Potential research direction is also concisely discussed to help guide biological functionalized strategies and inspire further innovations. It is hoped that this review can give assistance to the surface modification of cardiovascular Mg-based stents and promote future advancements in this emerging research field.

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Section: Surface Modification Of Mg Alloy Stentsmentioning

confidence: 99%

Section: Surface Modification Of Mg Alloy Stentsmentioning

confidence: 99%

Advances in coatings on magnesium alloys for cardiovascular stents – A review

Zhang

Yang

et al. 2021

Bioactive Materials

109

View full text Add to dashboard Cite

show abstract

“…On the other side, it is well known that the fluoride element generally exhibits hydrophobicity. The magnesium fluoride layer can not only resist the substrate from the corrosion medium but also provide a hydrophobic surface to prevent the corrosion ions from penetrating into the magnesium substrate, leading to the enhanced corrosion resistance [14]. Figure 3: SEM image of AZ31 Mg alloy after pickling for 1 min.…”

Section: Figure 2: Optical Microscopic Photograph Of Mg Alloy After Pmentioning

confidence: 99%

Effect of Pickling and Activation Treatments on the Performance of Electroless Plating of Ni-B Coating on AZ31 Mg Alloy

2019

CMR

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Pickling is particularly critical before NiB electroless plating to create a uniform and catalytically active surface. In the present work, pickling treatment of AZ31 Mg alloy was performed in phosphoric acid followed by immersion in 40% HF. The effect of concentration of both H 3 PO 4 and HF as well as the effect of time were investigated. The pickled samples were then electroless plated with a NiB composite. The performance of the NiB composite coating was investigated under the SEM.Results show that the highest quality coating was obtained upon pickling AZ31 Mg alloy samples in 50% phosphoric acid for 1 min, followed by activation in 40% HF for 15 min. Higher concentration of H 3 PO 4 results in a higher concentration of PO 3 −4 , leading to a higher tendency to produce insoluble films (mainly Mg 3 (PO 4) 2 and AlPO 4) on the substrate surface slowing down the rate of Mg alloy oxidization and dissolution. Activation of pickled AZ31 Mg samples in HF results in the formation of corrosion resistant dense layer of magnesium fluoride. SEM investigation predicted the electroless deposition of an adherent compact layer of NiB composite coating on the H 3 PO 4 /HF pickled AZ31 samples.

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“…Several studies [16][17][18][19][20][21] have shown that the fluoride conversion coating is suitable for protecting the biodegradable magnesium alloys against corrosion in biological environments while the coating is acceptable for the human body. The preparation of fluoride conversion coating can be based on dipping the magnesium alloy into the HF solution [16][17][18]22,23] or the less used way based on dipping the magnesium alloy into Na [BF 4 ] molten salt [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Corrosion Properties of Fluoride Conversion Coating Prepared on AZ31 Magnesium Alloy

et al. 2021

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Wrought AZ31 magnesium alloy was used as the experimental material for fluoride conversion coating preparation in Na[BF4] molten salt. Two coating temperatures, 430 °C and 450 °C, and three coating times, 0.5, 2, and 8 h, were used for the coating preparation. A scanning electron microscope and energy-dispersive X-ray spectroscopy were used for an investigation of the surface morphology and the cross-sections of the prepared coatings including chemical composition determination. The corrosion resistance of the prepared specimens was investigated in terms of the potentiodynamic tests, electrochemical impedance spectroscopy and immersion tests in the environment of simulated body fluids at 37 ± 2 °C. The increase in the coating temperature and coating time resulted in higher coatings thicknesses and better corrosion resistance. Higher coating temperature was accompanied by smaller defects uniformly distributed on the coating surface. The defects were most probably created due to the reaction of the AlxMny intermetallic phase with Na[BF4] molten salt and/or with the product of its decomposition, BF3 compound, resulting in the creation of soluble Na3[AlF6] and AlF3 compounds, which were removed from the coating during the removal of the secondary Na[MgF3] layer. The negative influence of the AlxMny intermetallic phase was correlated to the particle size and thus the size of created defects.

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Improving Corrosion Resistance and Biocompatibility of Magnesium Alloy by Sodium Hydroxide and Hydrofluoric Acid Treatments

Cited by 30 publications

References 39 publications

Advances in coatings on magnesium alloys for cardiovascular stents – A review

Advances in coatings on magnesium alloys for cardiovascular stents – A review

Effect of Pickling and Activation Treatments on the Performance of Electroless Plating of Ni-B Coating on AZ31 Mg Alloy

Characterization and Corrosion Properties of Fluoride Conversion Coating Prepared on AZ31 Magnesium Alloy

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