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| 1 | 等离子体电解氧化AM 50镁合金表面含黏土涂层的磨损与腐蚀行为显示文摘采用等离子体电解氧化(PEO)在AM 50镁合金表面制备涂层,研究添加黏土微粒对涂层显微组织、磨损和腐蚀行为的影响。采用铝基电解液制备PEO涂层,在电解液中添加5 g/L黏土颗粒,并与未添加的作对比。采用SEM、EDS和XRD对涂层的结构和成分进行表征。磨损测试采用球-盘式摩擦试验机,载荷为2、5和10 N。在0.5%(质量分数)NaCl溶液中,采用极化和电化学阻抗(EIS)实验研究涂层的腐蚀行为。结果表明,在5和10 N载荷下,添加黏土颗粒使涂层的耐磨性下降。磨损表面的SEM结果显示,含有黏土颗粒的涂层其磨损机制为黏着磨损和磨粒磨损。含黏土涂层的磨损性能较差,与涂层的黏结强度较低、粗糙度较高有关。动电位极化实验表明,添加黏土颗粒使涂层的腐蚀速率略微降低。EIS结果表明,含黏土涂层的耐腐蚀性归功于其较好的致密度。 | Farideh DAVOODI Masoud ATAPOUR Carsten BLAWERT Mikhail ZHELUDKEVICH | 2021 | Transactions of Nonferrous Metals Society of China2021，31，12： | 6 |
| 2 | Quasi-in vivo corrosion behavior of AZ31B Mg alloy with hybrid MWCNTs-PEO/PCL based coatings显示文摘This study investigated the effects of multi-walled carbon nanotubes(MWCNTs) and polycaprolactone(PCL) on the quasi-in vivo corrosion behavior of AZ31B Mg alloy treated by plasma electrolytic oxidation(PEO). Thin(~2 μm, PCTPCL4) and thick(~60 μm, PCTPCL6) PCL layers were applied only onto the MWCNTs-PEO coating(PCT) as it showed better corrosion performance. Findings reveal that incorporation of MWCNTs induced several structural and functional modifications in the PEO coating, such as increased roughness, a thicker inner barrier layer, and reduced hydrophilicity.Quasi-in vivo corrosion testing was carried out under controlled temperature, p H, and fluid flow in simulated body fluid(SBF) by electrochemical impedance spectroscopy(EIS) and hydrogen evolution experiments. EIS results revealed that, after 48 h immersion, a diffusion process controlled hydration of the ceramic coatings. Comparison of the collected hydrogen after 15 days of immersion in the quasi-in vivo environment revealed that the PEO and PCT ceramic coatings decreased hydrogen generation by up to 74% and 91%, respectively, compared to non-coated alloy.PCTPCL6 coating exhibited the lowest amount of collected hydrogen(0.2 m L/cm^(2)). The thick PCL layer delayed the onset of substrate corrosion for at least 120 h, reducing the corrosion rate by 85% compared with the PCT. | Morteza Daavari Masoud Atapour Marta Mohedano Hugo Mora Sánchez Juan Rodríguez-Hernández Endzhe Matykina Raul Arrabal Aboozar Taherizadeh | 2022 | Journal of Magnesium and Alloys2022，10，11： | 0 |
| 3 | 基于PLS和SVR模型评价铝合金双层涂层承载能力的新方法显示文摘为提高铝合金的承载能力,在AA6061铝合金表面制备由化学镀中间层和物理气相沉积(PVD)表面层组成的双层NiP/TiN涂层。根据涂层的厚度、附着力和弹性模量,采用偏最小二乘法(PLS)和支持向量回归(SVR)法模拟涂层的承载。结果表明,两种模型均可以模拟涂层的承载,但PLS模型优于SVR模型。厚度、附着力和弹性模量与载荷的相关系数分别为0.841、0.8092和0.7657,可见厚度对承载能力的影响最大。用XRD和SEM对样品的组成和结构进行表征,通过对涂层的磨损和附着力的评价,讨论涂层的承载能力。在2 N载荷和100 m滑动距离下的干滑动磨损试验表明,涂层试样在低荷载作用下被完全破坏。Rockwell表面硬度测试表明,具有高承载能力的样品不仅具有优良的摩擦学性能,还具有更大的附着力。 | Farideh DAVOODI Fakhreddin ASHRAFIZADEH Masoud ATAPOUR Reyhaneh RIKHTEHGARAN | 2022 | Transactions of Nonferrous Metals Society of China2022，32，6： | 0 |
| 4 | A self-healing and bioactive coating based on duplex plasma electrolytic oxidation/polydopamine on AZ91 alloy for bone implants显示文摘Magnesium(Mg) alloys are well-known in biomedical materials owing to their elastic module near to bone, biocompatibility and biodegradation properties. Nevertheless, poor corrosion resistance hinders their biomedical applications. Besides, it is necessary to endow Mg alloys with bioactive property, which is crucial for temporary bone implants. Here, a self-healing, corrosion resistant and bioactive duplex coating of plasma electrolytic oxidization(PEO)/polydopamine(PDA) is applied on AZ91 substrate using PEO and subsequent electrodeposition process. Moreover, the role of different electrodeposition times(60 s, 120 s) and dopamine concentrations(1 and 1.5 mg/ml) to improve corrosion resistance, bioactivity, biocompatibility and self-healing property and its mechanism are investigated. The results indicate that the PEO coating is efficiently sealed by the PDA, depending on the electrodeposition parameters. Noticeably, electrodeposition for 120 s in dopamine concentration of 1 mg/ml(120T-1C) results in the formation of uniform and crack-free PDA coating. Duplex PEO/PDA coatings reveal high bioactivity compared to PEO coating, owing to electrostatic interaction between PDA top-layer and calcium and phosphate ions as well as high hydrophilicity of coatings. In addition, duplex PEO/PDA coatings also show improved and more stable protective performance than the PEO and bare alloy, depending on the PDA deposition parameters. Noticeably, the corrosion current density of the 120T-1C decreases one orders of magnitude compared to PEO. In addition, the presence of a broad passivation region in the anodic polarization branch shows durable self-healing property via Zipper-like mechanism, demonstrating the duplex coating could preserve promising corrosion resistance.Furthermore, the cytocompatibility of duplex coated samples is also confirmed via interaction with MG63 cells. In summary, the PEO/PDA coating with great corrosion protection, self-healing ability, bioactivity and biocompatibility could be a promising candidate for degradable magnesium-based implants. | Safoora Farshid Mahshid Kharaziha Masoud Atapour | 2023 | Journal of Magnesium and Alloys2023，11，2： | 0 |
| 5 | Microstructure and Corrosion Properties of CP-Ti Processed by Laser Powder Bed Fusion under Similar Energy Densities显示文摘In this work, two types of CP Ti cubes with similar volumetric energy densities(VED) but diff erent process parameters were produced using laser powder bed fusion(LPBF) method. The corrosion behavior of the fabricated specimens was investigated by conducting electrochemical impedance spectroscopy(EIS) and polarization experiments in simulated body fl uid(SBF) solution at 37 °C. The results indicated that the microstructure and porosities, which are of great importance for biomedical applications, can be controlled by changing the process parameters even under constant energy densities. The sample produced with a lower laser power(E1) was featured with a higher level of porosity and thinner alpha laths, as compared with the sample fabricated with a higher laser power(E2). Moreover, results obtained from the bioactivity tests revealed that the sample produced with a higher laser power conferred a slight improvement in the bioactivity due to the higher amount of porosity. Lower laser power and hence higher porosity level promoted the formation of bone-like apatite on the surface of the printed specimens. The potentiodynamic polarization tests revealed inferior corrosion resistance for the fabricated sample with higher porosity. Moreover, the EIS results after diff erent immersion times indicated that a stable oxide film was formed on the surface of samples for all immersion times. After 1 and 3 days of immersion, superior passivation behavior was observed for the sample fabricated with lower laser power. However, very similar impedance and phase values were observed for all the samples after 14 days of immersion. | Mohammad Hossein Mosallanejad Saber Sanaei Masoud Atapour Behzad Niroumand Luca Iuliano Abdollah Saboori | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，9： | 0 |
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