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| 1 | In vitro degradation and cytocompatibility of a low temperature in-situ grown self-healing Mg-Al LDH coating on MAO-coated magnesium alloy AZ31显示文摘Basically,Mg–Al layered double hydroxide(LDH)coatings are prepared on the surface of micro-arc oxidation(MAO)coated magnesium(Mg)alloys at a high temperature or a low pH value.This scenario leads to the growth rate of LDH coating inferior to the dissolution rate of the MAO coating.This in turn results in limited corrosion resistance of the composite coating.In this study,a Mg–Al LDH coating on MAO-coated Mg alloy AZ31 is prepared through a water bath with a higher pH(13.76)at a lower temperature(60℃).FE-SEM,EDS,XRD,XPS,and FT-IR are applied to analyze the surface morphology,chemical compositions,and growth process.Electrochemical polarization,electrochemical impedance spectroscopy(EIS)and hydrogen evolution tests are employed to evaluate the corrosion resistance of the samples.The results disclose that the MAO coating is completely covered by the nanosheet-structured LDH coating with a thickness of approximately 3.8μm.The corrosion current density of the MAO-LDH composite coating is decreased four orders of magnitude in comparison to its substrate;the presence of a wide passivation region in anodic polarization branch demonstrates its strong self-healing ability,indicating the hybrid coating possesses excellent corrosion resistance.The formation mechanism of the LDH coating on the MAO-coated Mg alloy is proposed.Furthermore,the cytocompatibility is assessed via an indirect extraction test for MC3T3-E1 pre-osteoblasts,which indicates an acceptable cytocompatibility of osteoblasts for the composite coating. | Chang-Yang Li Ling Gao Xiao-Li Fan Rong-Chang Zeng Dong-Chu Chen Ke-Qian Zhi | 2020 | Bioactive Materials2020，5，2： | 14 |
| 2 | AZ31镁合金上Mg−Al LDH/Mg(OH)2/硅烷−Ce杂化涂层的耐蚀性显示文摘在AZ31镁合金基体上涂覆一种环保杂化涂层。通过原位蒸汽涂覆工艺制备Mg−Al层状双氢氧化物Mg−Al LDH/Mg(OH)2涂层,随后使用双-[三乙氧基甲硅烷基丙基]四硫化物(BTESPT)硅烷和Ce(NO3)3对蒸汽涂层进行表面改性,研究两者对AZ31镁合金的协同作用。通过X射线衍射仪(XRD)、扫描电子显微术(SEM)、傅里叶变换红外光谱(FT-IR)和X射线光电子能谱(XPS)研究杂化涂层的显微结构和组成特征。通过电位动力学极化(PDP)、电化学阻抗谱(EIS)和浸入3.5 wt.%NaCl溶液中的析氢速率评价涂层样品的耐蚀性。结果表明,在BTESPT硅烷和Ce(NO3)3存在下,合金的耐蚀性得到改善,这很可能是由于蒸汽涂层和硅烷涂层的协同作用增强了杂化涂层的阻隔性能。此外,还讨论涂层的形成机理和耐蚀机理。 | 仇在孟 曾荣昌 张芬 宋亮 李硕琦 | 2020 | Transactions of Nonferrous Metals Society of China2020，30，11： | 9 |
| 3 | Recent progress in superhydrophobic coating on Mg alloys:A general review显示文摘Magnesium(Mg)is a vital engineering material owing to its light weight and excellent mechanical properties.However,poor corrosion resistance limits its widely applications as well as its economic value.Hence,surface modification is essential for Mg and its alloys.Among the various coatings,superhydrophobic coating,which is inspired by nature,has received increasing attentions in the past decade.With a water contact angle larger than 150°,superhydrophobic coating can provide sufficient protection for Mg-based substrates.The model of superhydrophobic states and the protection mechanism of superhydrophobic coating are discussed in this review.Especially,the methods for fabricating superhydrophobic coatings on Mg alloys are reviewed.Meanwhile,some functional superhydrophobic coatings on Mg alloys are summarized.Finally,the challenges and future directions are proposed.We hope that this paper will provide a serviceable review for future research on superhydrophobic coatings on Mg alloys. | Feng Peng Dongdong Zhang Xuanyong Liu Yu Zhang | 2021 | Journal of Magnesium and Alloys2021，9，5： | 3 |
| 4 | Biocorrosion resistance and biocompatibility of Mg-AI layered double hydroxide/poly(L-lactic acid) hybrid coating on magnesium alloy AZ31显示文摘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 freeze-drying.The microstructure and composition of LDH/PLLA hybrid coating were analyzed by XRD,SEM,EDS and FT-IR.The biocorrosion behavior of hybrid coating was evaluated by potentiodynamic polarization,electrochemical impedance spectroscopy(EIS)and hydrogen evolution test in the Hank's solution.The 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 coatings.The corrosion current density of the LDH/PLLA-10 hybrid coating decreased three orders of magnitude in comparison to its substrate.It was proven that the existence of the PLLA coating further prolonged the service life of the Mg-AI-LDH coating.What's more,the MTT assay and livel dead staining showed that the LDH/PLL A-10 coating had good biocompatibility for Mouse NIH3T3 fibroblasts.The formation mechanism and the anti-corrosion mechanism of hybrid coatings were proposed. | Xiang SUN Qing-Song YAO Yu-Chao LI Fen ZHANG Rong-Chang ZENG Yu-Hong ZOU Shuo-Qi LI | 2020 | Frontiers of Materials Science2020，14，4： | 2 |
| 5 | Green corrosion inhibitors intercalated Mg:Al layered double hydroxide coatings to protect Mg alloy显示文摘Mg alloy was protected with Mg:Al layered double hydroxide(LDH)coating intercalated with three green corrosion inhibitors(sodium benzoate,3-aminopropyltriethoxysilane and 8-hydroxyquinoline).The in-situ hydrothermal approach was adopted to intercalate corrosion inhibitors into Mg:Al LDH coating.The intercalated Mg:Al LDH coating was successfully acquired,and the crystalline structure of Mg:Al LDH coating was verified with X-ray diffraction(XRD).The organic functional groups of corrosion inhibitors were identified with the help of Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS).The compact and uniform morphology was confirmed by scanning electron microscopy(SEM).The electrochemical measurement revealed better corrosion resistance of corrosion inhibitorintercalated Mg:Al LDH coatings as compared to that of pristine Mg alloy.The corrosion protection mechanism of corrosion inhibitors was described and unearthed the corrosion inhibitor with the best performance. | Muhammad Junaid Anjum Jing-Mao Zhao Vahdat Zahedi Asl Muhammad Uzair Malik Ghulam Yasin Waheed Qamar Khan | 2021 | Rare Metals2021，40，8： | 1 |
| 6 | LA43M镁锂合金表面水热合成Mg-Al LDH膜层的耐腐蚀及磨损性能显示文摘目的提高镁锂合金的耐蚀和耐磨性,拓宽其应用范围。方法保持水热温度为90℃,改变水热时间,采用原位水热法在LA43M镁锂合金表面制备了Mg-Al层状双金属氢氧化物(LDH)膜层。利用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)分别表征了膜层的表面形貌、成分及物相。采用浸泡试验、析氢试验、动电位极化测试以及摩擦磨损试验对膜层的耐蚀性、耐磨性进行了评估。结果水热反应后,在合金表面形成了细小片状结构,且随着水热时间的延长,尺寸变大,数量增加,分布越密集。经XRD分析,得到了LDH特征衍射峰。浸泡及析氢试验表明,LDH膜层的耐蚀性顺序为LDH-30 h>LDH-18 h>LDH-12 h>LA43M基体。其中LA43M基体在浸泡8 d后,腐蚀严重,出现了明显的腐蚀坑和裂纹;而LDH膜层试样腐蚀程度较轻,只在部分区域出现点蚀和微裂纹。动电位极化测试表明,水热30 h的膜层具有良好的耐蚀性。与基体相比,其自腐蚀电位提高了143.7 mV,腐蚀电流密度降低了约2个数量级。摩擦磨损试验结果显示,基体的摩擦因数最大,磨痕深而宽,而LDH膜层的摩擦因数均明显小于基体,磨痕浅而窄。结论Mg-Al LDH膜层在提高镁锂合金基体耐蚀性的同时,也能使基体的耐磨性有所改善。 | 张菊梅 候安荣 李嘉诚 段鑫 王博 连朵朵 张萌春 | 2022 | 表面技术2022，51，11： | 0 |
| 7 | Synergistic inhibitive effect of cysteine and iodide ions on corrosion behavior of copper in acidic sulfate solution显示文摘The synergistic inhibitive effect of cysteine(Cys)and iodide ions on the corrosion behavior of copper was examined in a 0.5 mol·L^(-1) Na_(2)SO_(4) solution.Potentiodynamic polarization curve revealed that Cys acted as a mixed type inhibitor with a major effect on the cathodic process,consequently decreased the corrosion current density by a great extent and shifted the corrosion potential negatively.The investigated results suggested that iodide ions can enhance the inhibition efficiency of Cys.The inhibition mechanism of Cys and the synergistic effect of the two examined reagents were investigated by fitting experimental impedance data according to a projected equivalent circuit for metal/electrolyte interface.Surface analysis further confirmed that the corrosion inhibition was realized due to the adsorption of the inhibitor molecules at the metal/solution interface.Langmuir adsorption isotherm was proposed to describe inhibition mechanism of Cys on copper surface.Active sites of Cys molecule were used to form inhibitor film on the copper surface.Addition of iodide ion increased its inhibition efficiency by enhancing adsorption of Cys cations through electrostatic interaction with I-pre-adsorbed on Cu surface. | Kebede W.Shinato Fei-Fei Huang Yan-Peng Xue Lei Wen Ying Jin Yong-Jun Mao Yang Luo | 2021 | Rare Metals2021，40，5： | 0 |
| 8 | A pH-response chemotherapy synergistic photothermal therapy for tumor suppression and bone regeneration by mussel-inspired Mg implant显示文摘Primary malignant bone tumors can be life-threatening.Surgical resection of tumor plus chemotherapy is the standard clinical treatment.However,postoperative recovery is hindered due to tumor recurrence caused by residual tumor cells and bone defect caused by resection of tumor tissue.Herein,a multifunctional mussel-inspired film was fabricated on Mg alloy,that is,an inner hydrothermal-treated layer,a middle layer of polydopamine,and an outer layer of doxorubicin.The modified Mg alloy showed excellent photothermal effect and thermal/pH-controlled release of doxorubicin.The synergistic effect of chemotherapy and photothermal therapy enabled the modified Mg alloy to kill bone tumor in vitro and inhibit tumor growth in nude mice.Moreover,because of the controlled release of Mg ions and biocompatibility of polydopamine,the modified Mg alloy supported extracellular matrix mineralization,alkaline phosphatase activity,and bone-related gene expression in C3H10T1/2.Bone implantation model in rats verified that the modified Mg showed excellent osteointegration.These findings prove that the use of mussel-inspired multifunction film on Mg alloy offers a promising strategy for the therapy of primary malignant bone tumor. | Hongwei Shao Shi Cheng Mengyu Yao Xiongfa Ji Hua Zhong DonghuiWang Xiujuan Fan Qian Li Jielong Zhou Yu Zhang Feng Peng | 2021 | Regenerative Biomaterials2021，8，6： | 0 |
| 9 | Research Progress on Corrosion Resistance of Magnesium Alloys with Bio-inspired Water-repellent Properties:A Review显示文摘Thanks to its excellent mechanical properties,magnesium alloys have many potential applications in the aerospace and other fields.However,failure to adequately solve corrosion problems of magnesium alloy becomes one of the factors restricting its wide use in many industrial fields.Inspired by nature,researchers designed and fabricated bio-inspired water-repellent(superhydrophobic and slippery liquid-infused porous surface)surfaces with special wetting properties by exploring the surface microstructures of plants and animals such as lotus leaf and nepenthes pitcher,exhibiting excellent corrosion-resistant performance.This article summarizes the research progress on corrosion resistance of magnesium alloys with bio-inspired water-repellent properties in recent years.It mainly introduces the corrosion reasons,types of corrosion of magnesium alloys,and the preparation of magnesium alloys with bio-inspired water-repellent properties to improve corrosion resistance.In particular,it is widely used and effective to construct water-repellent and anti-corrosion coating on the surface of magnesium alloy by surface treatment.It is hoped that the research in this review can broaden the application range of magnesium alloys and provide a powerful reference for the future research on corrosion resistance of magnesium alloys. | Jinkai Xu Qianqian Cai Zhongxu Lian Zhanjiang Yu Wanfei Ren Huadong Yu | 2021 | Journal of Bionic Engineering2021，18，4： | 0 |
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