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Performance and Application of Double-layered Microcapsule corrosion inhibitors

Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 845-853页

作者：余海燕 WANG Yingxiang WANG Ruizhi HU Lintong WANG Tianlei School of Materials Science and Engineering Tianjin Chengjian UniversityTianjin 300384China Tianjin Key Laboratory of Building Green Functional Materials Tianjin Chengjian UniversityTianjin 300384China

Double-layered microcapsule corrosion inhibitors were developed by sodium monofluorophosphate as the core material,polymethyl methacrylate as the inner wall material,and polyvinyl alcohol as the outer wall material combining the solvent evaporation method and spray drying *** protection by the outer capsule wall was used to prolong the service life of the corrosion *** dispersion,encapsulation,thermal stability of microcapsules,and the degradation rate of capsule wall in concrete pore solution were analyzed by ultra-deep field microscopy,scanning electron microscopy,thermal analyzer,and sodium ion release rate *** microcapsules were incorporated into mortar samples containing steel reinforcement,and the effects of double-layered microcapsule corrosion inhibitors on the performance of the cement matrix and the actual corrosion-inhibiting effect were *** experimental results show that the double-layered microcapsules have a moderate particle size and uniform distribution,and the capsules were completely *** microcapsules as a whole have good thermal stability below 230 ℃.The monolayer membrane structure microcapsules completely broke within 1 day in the simulated concrete pore solution,and the double-layer membrane structure prolonged the service life of the microcapsules to 80 days in the simulated concrete pore solution before the core material was completely *** mortar samples containing steel reinforcement incorporated with the double-layered microcapsule corrosion inhibitors still maintained a higher corrosion potential than the monolayer microcapsule corrosion inhibitors control group at 60 *** incorporation of double-layered microcapsules into the cement matrix has no significant adverse effect on the setting time and early strength.

关键词： corrosion inhibitors microcapsule double-layer structure potentiodynamic polarization curve

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Electrochemical and analytical characterization of three corrosion inhibitors of steel in simulated concrete pore solutions

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International Journal of Minerals,Metallurgy and Materials 2012年第1期19卷 38-47页

作者： Jin-jie Shi Wei Sun School of Materials Science end Engineering Southeast University Nanjing 211189 China Jiangsu Key Laboratory of Construction Materials Southeast University Nanjing 211189 China

corrosion inhibitors for steel, such as sodium phosphate （Na3PO4）, sodium nitrite （NaNO2）, and benzotriazole （BTA）, in simulated concrete pore solutions （saturated Ca（OH）2） were investigated. corrosion behaviors of steel in different solutions were studied by means of corrosion potential （Ecorr）, linear polarization resistance （LPR）, electrochemical impedance spectroscopy （EIS）, and potentiodynamic polarization （PDP）. A field emission scanning electron microscope （FESEM） equipped with energy dispersive X-ray analysis （EDXA） was used for observing the microstructures and morphology of corrosion products of steel. The results indicate that, compared with the commonly used nitrite-based inhibitors, Na3PO4 is not a good inhibitor, while BTA may be a potentially effective inhibitor to prevent steel from corrosion in simulated concrete pore solutions.

关键词： steel corrosion inhibitors electrochemical analysis concrete solutions

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Experimental and quantum chemical studies of carboxylates as corrosion inhibitors for AM50 alloy in pH neutral NaCl solution

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Journal of Magnesium and Alloys 2022年第2期10卷 596-611页

作者： Junjie Yang Pingli Jiang Youmin Qiu Chih-Yu Jao Carsten Blawert Sviatlana Lamaka Anissa Bouali Xiaopeng Lu Mikhail L.Zheludkevich Wei Li Institute of Advanced Wear&corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632PR China Helmholtz-Zentrum Hereon Institute of Surface ScienceGeesthacht 21502Germany School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001PR China Shenyang National Laboratory for Materials Science Northeastern University3-11 Wenhua RoadShenyang 110819PR China Faculty of Engineering University of KielKaiserstraße 2Kiel 24143Germany

Sodium salts of mono-and di-carboxylic acids(glycolic,fumaric and benzoic acid)were studied as corrosion inhibitors for AM50 alloy in pH neutral aqueous NaCl *** evolution,electrochemical and surface characterization techniques were employed to reveal their corrosion inhibition mechanism,whilst the molecular features of inhibitors were investigated by quantum chemical *** inhibitors reduced anodic dissolution of AM50 and their efficiency generally increased with time and concentration from 5 mM to 100 *** inhibition mechanism can be described as physisorption of inhibitive molecules on the surface of the intrinsic oxide layer followed by chemisorption with Mg^(2+)and Al^(3+),and the difference in inhibition action among these inhibitors was explained on the molecular scale.

关键词： Mg-Al magnesium alloy Neutral NaCl solution corrosion inhibitors Electrochemistry Density functional theory

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A time-saving method to assess the efficiency of corrosion inhibitors by electro osmosis

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 370-376页

作者： Chun-lei Geng Duan Weng Department of Materials Science and Engineering Tsinghua University Beijing 000 China Beijing Building Materials Academy of Sciences Research （State Key Laboratory） Beijing 100041 China

The corrosion inhibitor is one of the most important technologies to enhance the durability of steel-reinforced concrete. A kind of time-saving method was developed to assess the inhibitor efficiency by using a 32 V electric field to accelerate chloride ion migration in concrete. Potentiodynamic polarization scanning test was used to evaluate the corrosion states. The comprehensive efficiency of an inhibitor should be assessed in two aspects： resistance to chloride ion permeability and inhibiting efficiency. The specimens with different mixing amount of sodium nitrite and migration corrosion inhibitors were used to verify the accuracy and reliability of this method. The results show the differences in inhibiting efficiency of the inhibitors clearly, indicating the reliability of this time-saving method.

关键词： reinforced concrete corrosion corrosion inhibitors corrosion protection

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Synthesis of mono and bis-4-methylpiperidiniummethyl-urea as corrosion inhibitors for steel in acidic media

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Frontiers of Chemical Science and Engineering 2011年第1期5卷 43-50页

作者： Abbas TEIMOURI Nasrin SOLTANI Alireza Najafi CHERMAHINI Department of Chemistry Payame Noor University(PNU)Isfahan 81395-671Iran Department of Chemistry Payame Noor University(PNU)Shahin Shahr BranchIsfahan 83196Iran Department of Chemistry Yasouj UniversityYasouj 75918-74831Iran

Mono and bis-4-methylpiperidiniummethyl urea were synthesized,characterized and used as new corrosion inhibitors of mild steel in the acidic *** effect of two compounds on mild steel surface in the 1 mol·L^(–1 )sulphuric acid has been studied by a series of techniques,such as potentiodynamic polarization,weight loss and quantum chemical calculation *** polarization measurements showed that two inhibitors are mixed *** measurements showed that inhibition efficiencies enhanced with increase of inhibitor *** reveals that inhibitive actions of inhibitors were mainly due to adsorption on mild steel *** functional(DFT)calculations have been carried out for the title compounds by performing HF and DFT levels of theory using the standard 6-31G*basis set.

关键词： corrosion inhibitors mild steel acidic medium theoretical studies DFT

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Ionic liquids as electrodeposition additives and corrosion inhibitors

Ionic liquids as electrodeposition additives and corrosion i...

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The 3rd Asian Conference on Molten Salts and Ions Liquids

作者：张启波华一新李艳 Key Lab of Ionic Liquids Metallurgy Faculty of Metallurgical and Energy EngineeringKunming University of Science and Technology

Ionic liquids are molten salts with a melting point of 100 ℃ or below and solely consist of cations and *** a kind of novel green solvents,ionic liquids have been given broad and deep investigations,and enormous progresses in various fields were made during the recent 10 *** the fact that the application studies of ionic liquids have been proposed in various fields,no processes have as yet been developed to an industrial ***,the main interests are still focused on their industrial *** this article,two perspective applications of ionic liquids in hydrometallurgical fields including additives for metals electrodeposition and inhibitors for metal anti-corrosion were introduced.

关键词： ionic liquids additives metal electrodeposion corrosion inhibitors adsorption

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Functionalized carbon dots for corrosion protection:Recent advances and future perspectives

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International Journal of Minerals,Metallurgy and Materials 2023年第11期30卷 2112-2133页

作者： Li Zhao Jinke Wang Kai Chen Jingzhi Yang Xin Guo Hongchang Qian Lingwei Ma Dawei Zhang Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Key Laboratory of Biomechanics and Mechanobiology(Beihang University) Ministry of EducationBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing 100083China

Metal corrosion causes significant economic losses,safety issues,and environmental ***,its prevention is of immense research *** dots(CDs)are a new class of zero-dimensional carbon nanomaterials,which have been considered for corrosion protection applications in recent years due to their corrosion inhibition effect,fluorescence,low toxicity,facile chemical modification,and *** study provides a comprehensive overview of the synthesis,physical and chemical properties,and anticorrosion mechanisms of functionalized ***,the corrosion inhibition performance of different types of CDs is introduced,followed by discussion on their application in the development of smart protective coatings with self-healing and/or self-reporting *** effective barrier formed by CDs in the coatings can inhibit the spread of local damage and achieve self-healing *** addition,diverse functional groups on CDs can interact with Fe^(3+)and H^(+)ions generated during the corrosion process;this interaction changes their fluorescence,thereby demonstrating self-reporting ***,challenges and prospects for the development of CD-based corrosion protection systems are also presented.

关键词： carbon dots corrosion protection corrosion inhibitors self-healing self-reporting

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Release rate kinetics of corrosion inhibitor loaded halloysite nanotube-based anticorrosion coatings on magnesium alloy AZ91D

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Journal of Magnesium and Alloys 2021年第1期9卷 202-215页

作者： Swapnil H.Adsul Uday D.Bagale Shirish H.Sonawane R.Subasri Centre for Sol-Gel Coatings International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI)BalapurHyderabad 500005Telangana StateIndia Department of Food and Biotechnology South Ural State UniversityChelyabinsk 454080Russia Department of Chemical Engineering National Institute of TechnologyWarangal 506004Telangana StateIndia

Halloysite nanotubes were used as nanocontainers to hold corrosion inhibitors such as Ce^(3+)-Zr^(4+),2-mercaptobenzothiazole and 8-hydroxyquinoline in their *** acid assisted etching of the nanotubes was carried out with a view to increase the lumen diameter and thereby,increase the amount of loading of the corrosion *** morphology of as-received and etched halloysite nanotubes was ob-served using TEM *** loading of corrosion inhibitors was confirmed using SEM-EDS and BET *** microcapsules were used as capping agents for the ends of the loaded HNTs following which,they were dispersed into a hybrid sol-gel silica *** coating method was used to generate coatings on AZ91D substrates followed by heat treatment at 130℃ for 1 *** release rate kinetics of corrosion inhibitors from as-received and etched nanotubes was investigated in buffer solutions of 3.5 wt%NaCl at different *** release mechanism of corrosion inhibitors from the HNT lumen was validated using various semi-empirical *** were also evaluated for their corrosion protection ability using electrochemical techniques after exposure to 3.5 wt%NaCl solution for 120 *** generated using Ce^(3+)-Zr^(4+)loaded into as-received halloysite nanotubes have shown more effective corrosion protection when compared to other corrosion inhibitors after 120 h exposure to the corrosive medium.

关键词： Sol-gel coating Halloysite nanotubes corrosion inhibitors Release rate Magnesium alloy AZ91D

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Three novel dendritic chitosan derivatives for inhibiting acid corrosion of petroleum pipelines

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Petroleum Science 2023年第6期20卷 3918-3930页

作者： Guo-Dong Cui Yan-Ming Chen Qi-Ming Zhang Zheng Wang Tian Tang Qing Zhao Yu Zhang Li-Feng Zhang Yuan-Qi Gu Yang-Sheng Liu College of Environmental Sciences and Engineering Peking UniversityBeijing Key Laboratory for Solid Waste Utilization and ManagementBeijing100871China University of Houston HoustonTX77204United States State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing102249China CenerTech Tianjin Chemical Research and Design Institute Co. LtdChina National Offshore Oil Corp(CNOOC)Tianjin300131China Faculty of Environment and Life Beijing University of TechnologyBeijing100124China Shanxi International Energy Group Co. LtdTaiyuan030002ShanxiChina

In the process of exploration and development of oil and gas fields, the acidic environment of oil reservoir, production and transport processes cause corrosion of pipelines and equipment, resulting in huge economic losses and production safety risks. corrosion inhibitors were widely used in oil industry because of simple operation process and economical. In this study, three environmentally friendly corrosion inhibitors were synthesized based on the natural polysaccharide chitosan. corrosion inhibition of three dendritic chitosan derivatives (We name them BH, CH and DH) on mild steel in 1 mol/L HCl solution with natural ventilation system was evaluated by weight loss experiment, electrochemical analysis and surface morphology characterization. The experimental results showed that when the three dendritic chitosan derivatives added in the corrosive medium were 500 mg L^(−1), the corrosion inhibition efficiencies were all more than 80%. Based on quantum chemical calculation, inhibition mechanisms of three dendritic chitosan derivatives were investigated according to molecular structures. The results showed that the benzene ring, Schiff base and N atom contained in the molecule were the active centers of electron exchange, which were more likely to form a film on the carbon steel surface, thereby slowing or inhibiting corrosion. The results also predicted the corrosion inhibition effect BH > DH > CH, which was consistent with the experimental conclusion.

关键词： Chitosan derivatives corrosion inhibitors Carbon steel Acid inhibition Efficient and environmental

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Photothermal and pH dual-responsive self-healing coating for smart corrosion protection

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Journal of Materials Science & Technology 2022年第12期107卷 34-42页

作者： Yao Huang Panjun Wang Weimin Tan Wenkui Hao Lingwei Ma Jinke Wang Tong Liu Fan Zhang Chenhao Ren Wei Liu Dawei Zhang Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China National Engineering Research Center for Coatings CNOOC Changzhou Paint and Coatings Industry Research InstituteChangzhou 213016China State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute Co.Ltd. )Beijing 100083China BRI Southeast Asia Network for corrosion and Protection(MOE) Shunde Graduate School of University of Science and Technology BeijingFoshan 528300China

A novel self-healing coating with photothermal and pH dual-responsive properties has been designed to protect carbon steel against corrosion by loading the stimuli-responsive microcapsules into a shape memory epoxy coating. The sandwich-like microcapsules were based on reduced graphene oxide/mesoporous silica(r GO@MS) assembled with a p H-responsive poly(N,N-dimethylaminoethyl methacrylate)(PDMAEMA) layer, and were loaded with benzotriazole(BTA) inhibitors(abbreviated as rGO@MS-P-BTA). Under near-infrared(NIR) light irradiation, the prominent photothermal effect of rGO could not only elevate the coating temperature to activate the shape memory effect and close the coating scratch, but also facilitate the release of corrosion inhibitors to suppress the corrosion activity. Moreover,the PDMAEMA as a p H-driven “gatekeeper” realized the controlled release of BTA from microcapsules at acid conditions. The surface morphology analysis, electrochemical impedance spectroscopy(EIS), and scanning electrochemical microscopy(SECM) were performed to evaluate the self-healing performance of the composite coatings. The results showed that the combination of NIR light and p H-responsive selfhealing effects endowed the coating with short healing time and prominent healing efficiency.

关键词： Self-healing coatings corrosion inhibitors Photothermal effects pH-responsive Shape memory polymers

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