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In vitro Degradation of Pure Mg for Esophageal Stent in Artificial Saliva

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Journal of Materials Science & Technology 2016年第5期32卷 437-444页

作者： Rong-Chang Zeng Xiao-Ting li li-Jun liu shuo-qi li Fen Zhang College of Materials Science and Engineering Shandong University of Science and Technology State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology

Magnesium and its alloys as biodegradable implant materials can be potentially used in cardiovascular and orthopedic devices. However, few studies have focused on its application in esophageal stents. In this paper, time-lapse degradation characteristics of pure Mg were analyzed by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, hydrogen evolution, pH and electrochemical measurements after immersion in artificial saliva for different times. Results revealed that a dense degradation product film formed on samples, which mainly consisted of two kinds of layers： one was calcium phosphate compounds with different structures; the other was thin magnesium hydrate layer close to the substrate. Less pH increase and low degradation rate were ob- served in the first 5 days of immersion, which can be ascribed to the formation of a thicker and denser layer on the sample surface with increasing immersion time. And then there was an increase in degradation rate and pH values; the deposition layer remained almost intact after immersion for 6 and 8 days. After 10 days of immersion, the degradation rate and pH value remained stable, and the calcium phosphate layer was delaminated and the inner magnesium hydrate layer was exposed. This study indicated that pure Mg exhibited desirable degradation resistance in artificial saliva, which provided magnesiumbased materials with the potential to be used as esophageal stents.

关键词： Magnesium Biomaterials Esophageal stents Degradation Artificial saliva

Corrosion resistance of an amino acid-bioinspired calcium phosphate coating on magnesium alloy AZ31

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Journal of Materials Science & Technology 2020年第14期47卷 224-235页

作者： Xiao-li Fan Chang-Yang li Yu-Bo Wang Yuan-Fang Huo shuo-qi li Rong-Chang Zeng Corrosion Laboratory for light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

An L-cysteine-bioinspired calcium phosphate(Ca-P)coating is prepared upon magnesium alloy AZ31 in a water bath at 60℃.FE–SEM,FTIR,XRD,electrochemical characterization,hydrogen evolution tests and XPS were used to evaluate the microstructure,chemistry and corrosion performance of the *** indicate that L-cysteine promotes the nucleation process of the coating and significantly increases its *** can be attributed to the complexation of the carboxyl group and mercapto group of L-cysteine with calcium ***,the obtained Ca-P coating possesses higher corrosion resistance than that prepared in L-cysteine-free bath.

关键词： Magnesium alloys Phosphate Coating Corrosion resistance Amino acid

Corrosion resistance of Zn-AI layered double hydroxide/ poly（lactic acid） composite coating on magnesium alloy AZ31

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Frontiers of Materials Science 2015年第4期9卷 355-365页

作者： Rong-Chang ZENG Xiao-Ting li Zhen-Guo liU Fen ZHANG shuo-qi li Hong-Zhi CUI College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266510 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao 266590 China

A Zn-AI layered double hydroxide （ZnAI-LDH） coating consisted of uniform hexagonal nano-plates was firstly synthesized by co-precipitation and hydrothermal treatment on the AZ31 alloy, and then a poly（lactic acid）（PLA） coating was sealed on the top layer of the ZnAI-LDH coating using vacuum freeze-drying. The characteristics of the ZnAI-LDH/PLA composite coatings were investigated by means of XRD, SEM, FTIR and EDS. The corrosion resistance of the coatings was assessed by potentiodynamic polarization and electrochemical impedance spectroscopy （EIS）. The results showed that the ZnAI-LDH coating contained a compact inner layer and a porous outer layer, and the PLA coating with a strong adhesion to the porous outer layer can prolong the service life of the ZnAI-LDH coating. The excellent corrosion resistance of this composite coating can be attributable to its barrier function, ion-exchange and self-healing ability.

关键词： magnesium corrosion layered double hydroxide (LDH) poly(lactic acid)(PLA) ion-exchange self-healing

In vitro corrosion of Mg-Ca alloy- The influence of glucose content

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Frontiers of Materials Science 2017年第3期11卷 284-295页

作者： Lan-Yue CUI Xiao-Ting li Rong-Chang ZENG shuo-qi li En-Hou HAN liang SONG College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China National Engineering Center for Corrosion Control Institute of Metals Research Chinese Academy of Sciences Shenyang 110016 China

Influence of glucose on corrosion of biomedical Mg-1.35Ca alloy was made using hydrogen evolution, pH and electrochemical polarization in isotonic saline solution. The corrosion morphologies, compositions and structures were probed by virtue of SEM, EDS, FTIR, XRD and XPS. Results indicate that the glucose accelerated the corrosion of the alloy. The elemental Ca has no visible effect on the corrosion mechanism of glucose for the Mg-1.35Ca alloy in comparison with pure Mg. In addition, the presence of CO2 has beneficial effect against corrosion due to the formation of a layer of carbonate- containing products.

关键词： magnesium corrosion glucose biomaterial

Mechanical and corrosion properties of Al/Ti film on magnesium alloy AZ31B

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Frontiers of Materials Science 2015年第1期9卷 66-76页

作者： Rong-Chang ZENG KeJIANG shuo-qi li Fen ZHANG Hong-Zhi CUI En-Hou HAN College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao 266590 China Institute of Metals Research Chinese Academy of Sciences Shenyang 110016 China

Preparation of titanium film on magnesium substrate faces a challenge due to non-Fickian inter-diffusion between titanium and magnesium. Aluminum can build a bridge between titanium and magnesium. Al/Ti duplex coatings were deposited on magnesium alloy AZ31B using magnetron sputtering （MS）. The low temperature diffusion bonding behavior of the MglAl/Ti coating was investigated through SEM and its affiliated EDS. The phase structure and critical load of the coatings were examined by means of XRD and scratch tests, respectively, The results demonstrated that the bonding strength was significantly improved after a post heat treatment （HT） at a temperature of 210℃. The diffusion mechanism of the interfaces of MglAI and Al/Ti in the coating was discussed based on the analysis of formation energy of vacancies and diffusion rates. The Al/Ti dual layer enhanced the corrosion resistance of the alloy. And the HT process further increased the corrosion resistance of the coated alloy. This result implies that a post HTat a lower temperature after MS is an effective approach to enhance the bonding strength and corrosion resistance of the Al/Ti film on Mg alloys.

关键词： magnesium alloy aluminum/titanium coating magnetron sputtering (MS) diffusion bonding strength

Biocorrosion resistance and biocompatibility of Mg-AI layered double hydroxide/poly(L-lactic acid) hybrid coating on magnesium alloy AZ31

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Frontiers of Materials Science 2020年第4期14卷 426-441页

作者： Xiang SUN qing-Song YAO Yu-Chao li Fen ZHANG Rong-Chang ZENG Yu-Hong ZOU shuo-qi li Corrosion Laboratory ftor light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China

A Mg-AI layered double hydroxide(Mg-AI-LDH)coating was firstly synthesized via an in-situ steam coating growth method on the AZ31 Mg alloy,and then was modified with poly(L-lactic acid)(PLLA)via dipping and vacuum *** microstructure and composition of LDH/PLLA hybrid coating were analyzed by XRD,SEM,EDS and *** biocorrosion behavior of hybrid coating was evaluated by potentiodynamic polarization,electrochemical impedance spectroscopy(EIS)and hydrogen evolution test in the Hank's *** results showed that LDH/PLLA coatings exhibited a much dense layer compared to the unmodified Mg-AI-LDH coating with unobvious boundary between PLLA and LDH *** corrosion current density of the LDH/PLLA-10 hybrid coating decreased three orders of magnitude in comparison to its *** was proven that the existence of the PLLA coating further prolonged the service life of the Mg-AI-LDH ***'s more,the MTT assay and livel dead staining showed that the LDH/PLL A-10 coating had good biocompatibility for Mouse NIH3T3 *** formation mechanism and the anti-corrosion mechanism of hybrid coatings were proposed.

关键词： magnesium alloy layered double hydroxide poly(L-lactic acid) corrosion resistance biocompatbility

Corrosion Resistance of Silane-Modified Hydroxide Zinc Carbonate Film on AZ31 Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 373-380页

作者： Rong-Chang Zeng li-Jun liu Ting-Ting Pang Fen Zhang Wei-Wei Zhang shuo-qi li Hong-Zhi Cui En-Hou Han College of Materials Science and Engineering Shandong University of Science and Technology State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Institute of Metals Research Chinese Academy of Sciences

The corrosion resistance of magnesium alloys can be improved using functional surface modification such as hydrophobic *** this study,a hierarchical hydroxide zinc carbonate（HZC） film was fabricated on AZ31 magnesium alloy via a simple chemical-bath deposition process using urea aqueous *** morphologies,compositions and corrosion resistance of the hydrophobic film were analyzed using scanning electron microscopy,X-ray diffraction and Fourier transform infrared spectrometer,and electrochemical measurements as *** results revealed that the HZC film displayed flower-like protrusions and had a thickness of approximately 100 *** fluoroalkylsilane（FAS）-modified HZC film exhibited a hydrophobic property with a water contact angle of 131.3°.The FAS/HZC film significantly improved the corrosion resistance of the AZ31 alloy due to hierarchical structures and hydrophobic modification.

关键词： Magnesium alloy Hydrophobicity Silane Surface modification Corrosion

Corrosion resistance of biodegradable polymeric layer-by-layer coatings on magnesium alloy AZ31

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Frontiers of Materials Science 2016年第2期10卷 134-146页

作者： Lan-Yue CUI Rong-Chang ZENG Xiao-Xiao ZHU Ting-Ting PANG shuo-qi li Fen ZHANG College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao 266590 China

Biocompatible polyelectrolyte multilayers （PEMs） and polysiloxane hybrid coatings were prepared to improve the corrosion resistance of biodegradable Mg alloy AZ31. The PEMs, which contained alternating poly（sodium 4-styrenesulfonate）（PSS） and poly（allylamine hydrochloride）（PAH）, were first self-assembled on the surface of the AZ31 alloy substrate via electrostatic interactions, designated as （PAH/PSS）s/AZ31. Then, the （PAH/PSS）5/AZ31 samples were dipped into a methyltrimethoxysilane （MTMS） solution to fabricate the PMTMS films, designated as PMTMS/（PAH/PSS）5/AZ31. The surface morphologies, microstructures and chemical compositions of the films were investigated by FE-SEM, FTIR, XRD and XPS. Potentiodynamic polarization, electro- chemical impedance spectroscopy and hydrogen evolution measurements demonstrated that the PMTMS/（PAH/PSS）s/AZ31 composite film significantly enhanced the corrosion resistance of the AZ31 alloy in Hank＇s balanced salt solution （HBSS）. The PAH and PSS films effectively improved the deposition of Ca-P compounds including Ca3（PO4）2 and hydroxyapatite （HA）. Moreover, the corrosion mechanism of the composite coating was discussed. These coatings could be an alternative candidate coating for biodegradable Mg alloys.

关键词： magnesium alloy polyelectrolyte polysiloxane corrosion layer-by-layer

Advance in Antibacterial Magnesium Alloys and Surface Coatings on Magnesium Alloys:A Review

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Acta Metallurgica Sinica(English Letters) 2020年第5期33卷 615-629页

作者： Yang Shao Rong-Chang Zeng shuo-qi li Lan-Yue Cui Yu-Hong Zou Shao-Kang Guan Yu-Feng Zheng Corrosion Laboratory for light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China

Magnesium(Mg)alloys as a bioabsorbable light metal have shown great clinical potential as bone replacement *** this review,the categories,progress in cutting-edge preparation technologies and antibacterial mechanisms of Mg alloys and considerable numbers of corrosion-resistant and functional coatings are *** relationship among the microstructure(grain size,intermetallic compounds),biocorrosion resistance and biocompatibility for antibacterial Mg alloys is *** challenge and outlooks of biomedical Mg alloys and coatings are proposed from an antibacterial perspective.

关键词： Magnesium alloys Antibacterial properties Coatings Degradation Biomaterial