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Bio-inspired superhydrophobic magnesium alloy surfaces with active anti-corrosion and self-healing properties

Nano Research 2023年第2期16卷 3312-3319页

作者： Qiang Li Xudong Zhang Shuang Ben Zhihong Zhao Yuzhen Ning Kesong Liu Lei Jiang Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology School of Chemistry Beihang UniversityBeijing 100191China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China

Bio-inspired superhydrophobic magnesium(Mg)alloy surfaces are of increasing interest in corrosion protection due to superior barrier and shielding effects.However,superhydrophobic(SHB)anti-corrosion surfaces are susceptible to damage,which limit their extensive applications.To this end,a micro/nano structure-functional molecule SHB composite coating with self-healing and active anti-corrosion dual-function properties was designed on Mg alloys substrate.The dual-function SHB composite anti-corrosion coating based on lauric acid(La)intercalated and modified hydrotalcite(La-LDH)consisted of three-layer structure,namely La-LDH powder/polydimethylsiloxane(PDMS)/La-LDH film.The anti-corrosion performance of as-prepared coatings was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy(EIS).The results indicate that the SHB coating shows excellent active corrosion resistance.Moreover,we also examined the self-healing and anti-corrosion properties of SHB coating upon physical damage and explained the healing mechanism.After heat treatment,the damaged SHB coating regain its surface microstructure and corrosion protection property.This work expands new insights for the wide application of Mg alloys and the research in the field of metal protection.

关键词： magnesium alloys anti-corrosion coating superhydrophobic self-healing active anti-corrosion property

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An electrochemical method for evaluating the resistance to cathodic disbondment of anti-corrosion coatings on buried pipelines

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Journal of University of Science and Technology Beijing 2007年第5期14卷 414-419页

作者： Chan Li Bei Cao Yinshun Wu Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

Methods for evaluating the resistance to cathodic disbondment （RCD） of anti-corrosion coatings on buried pipelines were reviewed. It is obvious that these traditional cathodic disbondment tests （CDT） have some disadvantages and the evaluated results are only simple figures and always rely on the subjective experience of the operator. A new electrochemical method for evaluating the RCD of coatings, that is, the potentiostatic evaluation method （PEM）, was developed and studied. During potentiostatic anodic polarization testing, the changes of stable polarization current of specimens before and after cathodic disbonding （CD） were measured, and the degree of cathodic disbondment of the coating was quantitatively evaluated, among which the equivalent cathodic disbonded distance AD was suggested as a parameter for evaluating the RCD. A series of testing parameters of the PEM were determined in these experiments.

关键词： buried pipeline anti-corrosion coating resistance to cathodic disbondment （RCD） potentiostatic evaluation method（PEM） fusion bonded epoxy （FBE） three-layer polyethylene （3PE）

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Layer-by-layer stacked graphene nanocoatings by Marangoni self-assembly for corrosion protection of stainless steel

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Chinese Chemical Letters 2021年第1期32卷 501-505页

作者： Chen Ye Yangguang Zhu Hongyan Sun Feiyue Chen Huifang Sun Wen Dai Qiuping Wei Li Fu Aimin Yu Shiyu Du Minghui Yang Liang-Feng Huang Jinhong Yu Nan Jiang Cheng-Te Lin Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and Engineering(NIMTE)Chinese Academy of SciencesNingbo 315201China 100049 China Laboratory of Environmental Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China Bionic Sensing and Intelligence Center(BSIC) Institute of Biomedical and Health EngineeringShenzhen Institutes of Advanced TechnologyChinese Academy of ScienceShenzhen 518055China College of Science Henan University of TechnologyZhengzhou 450001China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China School of Materials Science and Engineering Central South UniversityChangsha 410083China College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou 310018China Department of Chemistry and Biotechnology Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthorn VIC 3122Australia Ningbo Institute of Materials Technology and Engineering(NIMTE) Chinese Academy of SciencesNingbo 315201China

Graphene nanosheets are widely used in anti-corrosion polymeric coating as filler,owing to the excellent electrochemical inertness and barrier property.However,as the arrangement of graphene nanosheets is difficult to form a perfect layered structure,polymeric coating with graphene nanosheets usually needs micron-scale thickness to ensure the enhancement of corrosion protection.In this work,layer-by-layer stacked graphene nanocoatings were fabricated on stainless steel by self-assembly based on Marangoni effect.The anti-corrosion property of graphene coatings were studied through Tafel polarization curves,electrochemical impedance spectroscopy and accelerated corrosion test with extra applied voltage.The self corrosion current density of optimized three-layered graphene coated sample was one quarter of that of bare stainless steel.And the self corrosion potential of optimized sample is increased to-0.045 V.According to the results,graphene nanocoatings composed of layered nanosheets exhibits good anticorrosion property.Besides,the self-assembly method provide a promising approach to make layeredstructure coating for other researches about 2 D material nanosheets.

关键词： Self-assembly Graphene nanosheets Layer-by-layer stacking Electrochemical corrosion anti-corrosion coating

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corrosion PROTECTION OF MILD STEEL BY ELECTROACTIVE POLYANILINE coatingS

CORROSION PROTECTION OF MILD STEEL BY ELECTROACTIVE POLYANIL...

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第十届全国缓蚀剂学术讨论及应用技术经验交流会

作者： P.Li T.C.Tan Jim.Y.Lee NATIONAL UNIVERSITY OF SINGAPORE

The ability of polyaniline（PANi）to act as a protective coating for mild steel corrosion in saline and acid was investigated by electrochemical impedance spectroscopy.The impedance behaviour is best explained by a mediated redox reaction in which PANi passivates the metal surface and reoxidizes itself by dissolved oxygen.The effectiveness of such process,which also provides the repassivation of damaged films,is greater in acids.The performance of PANi is further enhanced by the presence of a top coat to increase the diffussional resistance for the corrosion species.

关键词： polyaniline corrosion protection AC impedance passivation anti-corrosion coating

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