应我校材料学院胡津教授与王亚明教授邀请，德国亥姆霍兹联合会材料与海洋研究中心腐蚀与表面工程系教授Mikhail L. Zheludkevich、Carsten Blawert博士与Maria Serdechnova博士将于2018年11月29–12月1日来我校进行访问交流、科研合作，并作学术报告，欢迎广大师生参加。
学术报告1：Active protective multi-functional coatings on basis of smart nanocontainers
报告人：Mikhail L. Zheludkevich
时间：2018年11月30日 13:30 – 15:00
地点：材料楼521
内容：The destructive effect of environment and the corrosion induced degradation are the important problems which determine the service life of many metallic components including those exploited in marine environments. The application of organic coatings is the most common and cost effective method of improving protection and durability of metallic structures. However the degradation processes develop faster after disruption of the protective barrier. Therefore an active protection based on “self-healing” of defects in coatings is necessary to provide long-term effect. The active corrosion protection of metallic substrates can be achieved by the addition of corrosion inhibiting compounds to the protective coatings. However, direct mixing of an inhibitor with coating formulations can lead to important drawbacks decreasing barrier properties of the coating and diminishing activity of the inhibitor. Moreover the complexity of the corrosion mechanisms and variety of the conditions where metallic structures can be used calls for the combination of different inhibitors in the same corrosion protection system. This is very problematic in the case of direct addition of different inhibitors due to cross-talk between them.
The present paper overviews our recent progress in development of novel protective coatings with self-healing ability on the basis of nanocontainers that release entrapped corrosion inhibitor in response to presence of corrosive species. The new nanocontainers for organic and inorganic corrosion inhibitors were developed in this work employing nanocarriers including polyelectrolyte layer by layer assembled structures, mesoporous nanoparticles, halloysite nanotubes and different nanoclays. The combination of different nanocontainers in the same coating system was demonstrated to provide an important cooperative effect especially when active coatings for hybrid assemblies are considered.
学术报告2：Control of Mg alloy degradation by PEO processing
报告人：Carsten Blawert
时间：2018年11月30日 15:00-16:30
地点：材料楼521
内容：Magnesium alloys are not very corrosion resistant under various aqueous or humid conditions and the relatively low corrosion resistance of magnesium alloys is currently limiting their applications. Therefore, understanding and improving the corrosion behaviour of magnesium alloys is important for their future applications.
While the possibilities of improving the corrosion resistance (especially galvanic corrosion) by alloying are limited, application of coatings is the other alternative for improving corrosion resistance and offering corrosion protection. The PEO process (plasma electrolytic oxidation) is one of the most promising coating solutions for Mg alloys converting the magnesium surface to hard ceramic-like coatings by formation of micro arc discharges. Unfortunately, the discharges also introduce defects to the coatings such as discharge channels, pores from gas inclusions and cracks, with negative effects on the corrosion resistance. Such defects are quite critical for magnesium alloys, because they are offering fast path-ways for the electrolyte to reach the substrate and initiate corrosion attack. The presentation will demonstrate how the open porosity of PEO can be used to turn the inherent disadvantages into benefits. Microstructure-property relations are given to understand how PEO coatings can be tuned to the requirements of different applications or how duplex treatments can be used to add additional value. Multifunctional coatings with anticorrosion, self-lubrication, anti-wear, bioactive and photocatalytic properties can be produced with the aid of additives to the electrolytes and/or post-treatments using the open porosity.
学术报告3：Active corrosion protection of aluminum alloy AA2024 using LDH nanocontainers
报告人：Maria Serdechnova
时间：2018年11月30日16:30-18:00
地点：材料楼521
内容：
The use of chromate-based treatments is banned in many industrial applications due to high toxicity. Recently, layered double hydroxides (LDH) were studied as environmentally friendly nanocontainers, suitable for corrosion protection of AA2024 alloy. It was shown, that LDHs loaded with corrosion inhibitors act as smart nanocontainers: the release of a corrosion inhibitor and the formation of a protective layer takes place only when defects appears and corrosion starts. The same idea was extended in order to add supplementary self-healing properties to AA2024 treated by tartaric sulfuric acid (TSA) anodizing and plasma electrolytic oxidation (PEO) methods. This is important since properties of hard and well-adherent anodic layers (PEO and TSA) are significantly compromised by defects in the layer (various pores and cracks).
In frame of this presentation, the structure, morphology and composition of PEO and TSA coatings with parental ZnAl LDH-nitrate and LDH loaded with corrosion inhibitor (vanadate) will be considered. It will be shown that the amorphous bohemite phase is suitable for LDH growth, while crystalline α- and γ-Al2O3 can not be converted into LDH containers. The corrosion behavior and the effectiveness of LDH formation and inhibitor intercalation will be analysed, showing a remarkable increase in the corrosion resistance of the LDH-inhibitor treated samples comparing with PEO and TSA coated AA2024 specimen.
报告人介绍：
Mikhail L. Zheludkevich教授简介：德国海姆霍兹材料与海洋研究中心镁创新中心腐蚀与表面工程系主任，德国基尔大学工程系教授。Mikhail L.Zheludkevich教授是镁表面处理及腐蚀研究方面的专家。主要研究方向有：镁表面纳米结构涂层、镁腐蚀与防护、表面处理、镁基生物医用材料方面等。担任欧洲腐蚀协会空间腐蚀控制工作组副主席、欧洲碳钢研究技术组（TGS7）成员、EFC科学会成员等职务。Mikhail L.Zheludkevich教授的研究成果包括：110多篇SCI论文，25篇受邀请报告，12项发明专利，此外，Mikhail L.Zheludkevich教授还兼任4项欧洲、2项国际项目的负责人，15项国际项目的研究员等（如车辆智能容器多层防护材料等项目）。近五年来，Mikhail L.Zheludkevich教授发表多篇高影响因子的SCI文章，包括Acta Biomaterialia, Scripta Materialia, corrosion science、Electrochemistry Communication、Journal of Materials Chemistry等杂志。在Scopus上累计引用次数已达到4300次，在Google scholar上累计引用次数已超过5300次。
Carsten Blawert博士简介：德国克劳斯塔尔工业大学工学博士，德国亥姆霍兹联合会材料与海洋研究中心腐蚀与表面工程系研究员，多年来从事于等离子体电解氧化技术，主要研究方向为镁及镁合金表面腐蚀与防护技术研究。在该方面取得了大量的成果并发表了170多篇SCI文章。累计影响因子(非自引)达4852。
Maria Serdechnova博士简介：博士后，德国亥姆霍兹联合会材料与海洋研究中心腐蚀与表面工程系研究员。主要研究方向包括智能涂层、涂层防护应用和有机/无机化合物合成。5个欧洲项目(ACTICOAT, TRANSFER, TUMOCS等)及一个国际项目(DFG-BAS)的参与或负责人。累计发表10余篇SCI文章，在从事智能涂层方面取得了突出的成果。
