Nowadays,despite advancements in anticorrosion technologies,the application of magnesium(Mg)alloys in marine environments continues to encounter significant challenges in corrosion protection against biofouling.Given ...Nowadays,despite advancements in anticorrosion technologies,the application of magnesium(Mg)alloys in marine environments continues to encounter significant challenges in corrosion protection against biofouling.Given the limitations of single-component materials,achieving a synergistic protective effect is a critical requirement.This study proposes a multistage slow-release system to fabricate a composite of multistage nanocontainers based on a three-dimensional(3D)bio-template.Specifically,the design integrates the coupling of multiple nanocontainers to leverage the synergistic effects of multistage retardation.The M-CeO_(2)-LDH/DE coating leverages the porous loading capability of DE,the responsive release function of LDH,and the redox activity of CeO_(2),resulting in a significant enhancement of anticorrosion performance while effectively inhibiting the adhesion of sulfate-reducing bacteria(SRB)and Chlorella vulgaris.Furthermore,the study elucidates the effects of multistage nanocontainers on the anticorrosion and antifouling properties of magnesium alloy coatings,as well as the potential mechanism for multistage slow-release protection.As a result,the coating achieved an antimicrobial efficiency of 98.85%at a corrosion inhibitor loading of 24.9 wt.%,while the corrosion current density at the scratches decreased from 25.2μA·cm^(−2)to-12.5μA·cm^(−2).The M-CeO_(2)-LDH/DE coating integrates highly effective corrosion resistance,biofouling protection,and excellent mechanical properties.DFT calculations model the varying adsorption behavior of 2-MBI and confirm the multistage release mechanism of the nanocontainer for the corrosion inhibitor.This study not only introduces innovative strategies for developing high-performance protective coatings but also establishes a robust foundation for the broader application of magnesium alloys in marine environments,underscoring their significant potential for engineering applications.展开更多
Responsive nanocontainers have dual functions in targeted delivery of corrosion inhibitors and emulsion development of shale oil in oil and gas fields,exhibiting potential for simultaneously achieving metal protection...Responsive nanocontainers have dual functions in targeted delivery of corrosion inhibitors and emulsion development of shale oil in oil and gas fields,exhibiting potential for simultaneously achieving metal protection and efficient oil and gas development from a material perspective.Here,we propose the preparation of a pH-responsive nanocontainer,HMSNs-g-PDEAEMA(poly[2-(N,N-diethyl amino)ethyl-methacrylate](PDEAEMA)grafted onto hollow mesoporous spherical silica(HMSNs)),to integrate the delivery of 2-mercaptobenzothiazole(MBT)for targeted corrosion inhibition and the emulsification of oil as Pickering emulsifiers.Under acidic conditions(reduced pH value caused by localized corrosion or high concentration acidic gases),PDEAEMA chains are protonated and extended by electrostatic repulsion,exposing pores on HMSNs surface and allowing the controlled release of loaded MBT molecules.Once transforming into a neutral or alkaline environment,the responsive release of the MBT process is inhibited.After the fluid passes through the wellbore and enters the shale layer,the HMSNs-g-PDEAEMA nanocontainers act as Pickering emulsifiers to achieve emulsification.The emulsified oil can be extracted onto the ground more efficiently,and a following pH-responsive demulsification process can be achieved.Overall,through a pH-responsive nanocontainer material,the dual function of corrosion inhibition and emulsification in oil and gas development is possible to be simultaneously achieved.展开更多
The preparation of pH-responsive nanocontainers by typical silane modification of the mesoporous silica nanoparticle(MSN)surface is usually high-cost,complex,and time-consuming,which remains a great challenge for effe...The preparation of pH-responsive nanocontainers by typical silane modification of the mesoporous silica nanoparticle(MSN)surface is usually high-cost,complex,and time-consuming,which remains a great challenge for effective corrosion protection of magnesium alloy.Here,a new strategy to construct pH-responsive nanocontainers(MSN-MBT@LDH)is demonstrated.The nanocontainers consist of corrosion inhibitor(2-mercaptobenzothiazole,MBT)loaded MSN core and layered double hydroxide(LDH)nanosheet shell serving as gatekeepers.The successful loading of MBT and encapsulation by LDH nanosheets were confirmed by a series of characterization such as scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy(STEM-EDS)and N2 adsorption/desorption isotherms.The pH-responsive feature of the nanocontainers was demonstrated by determination of the MBT concentration in buffer solutions with different pH values.A smart corrosion protection system on Mg alloy is obtained by incorporating the synthesized nanocontainers into a self-assembled nanophase particle(SNAP)coating.The electrochemical tests and visual observations show that the hybrid coating has the best barrier properties and robustness in corrosion protection in NaCl corrosive solutions in comparison with the control coatings.The present method simplifies the synthesis processes of nanocontainers and eliminates the potential detrimental effect of excess gatekeepers on the coating.The findings provide new insights into the preparation of scalable nanocontainers.The self-healing coatings are expected to have widespread applications for corrosion protection of Mg alloy and other metals.展开更多
Polymer nanocomposite coatings(PNCCs)are unprecedented generation of coatings engineered for displaying inexpensive and brilliant functional surface coatings with eminent corrosion guard,mechanical resistance,antimicr...Polymer nanocomposite coatings(PNCCs)are unprecedented generation of coatings engineered for displaying inexpensive and brilliant functional surface coatings with eminent corrosion guard,mechanical resistance,antimicrobial,chemical durability,electrical insulation,and UV aging features.Due to their widely anticipation in petroleum,applications in building,conveyance,aerospace,electronics,automobiles and energy,these multi-functional coatings have a tremendous leverage in human life,all technological and scientific subjects.Numerous applications have been made for multilateral polymers like polyurethane(PU),epoxy(EP),polyaniline(PANI)conductive polymer,polypyrrole(PPy),and etc,on various metallic surfaces especially,carbon steel substrate owing to their excellent resistance properties.Practically,nanomaterials can possess potential in the all-interdisciplinary domains of materials science and engineering,chemical and physical sciences,biological and health sciences.As known,the designed polymer nanocomposite coating paradigm is fundamentally constituted from polymer or resin as a vehicle and inorganic nanofillers(nanoparticles and nanocomposites).Some commercialized and excessively employed nanocontainers in polymer nanocomposite coating formulations,like ZnO,TiO_(2),carbon nanotubes(CNTs),clay,SiO_(2),Al_(2)O_(3),graphene,GO,CeO_(2),ZrO_(2),FeTiO_(3),etc were discussed.The current review covered the chemistry and potential applications of the largest utilized multifunctional polymer nanocomposite coatings such as EP,PU and other considerable PNCCs.Lately,a titanic attention was made for epoxy nanocomposites because of their distinct physicochemical characteristics,which result from the combined qualities of the nanoparticles and polymer material unity.In addition,the author incorporated some of his scientific contributions in this area represented in construction of innovative functional polymer nanocomposites for a variety of uses with high economic,industrial impacts and future orientation.Furthermore,some newly published applications of polymer nanocomposite coatings were incorporated and discussed.展开更多
Smart micro-arc oxidation(MAO)/epoxy resin(EP) composite coatings were formed on AZ31 magnesium(Mg) alloy. Mesoporous silica nanocontainers(MSN) encapsulated with sodium benzoate(SB) corrosion inhibitors were strategi...Smart micro-arc oxidation(MAO)/epoxy resin(EP) composite coatings were formed on AZ31 magnesium(Mg) alloy. Mesoporous silica nanocontainers(MSN) encapsulated with sodium benzoate(SB) corrosion inhibitors were strategically incorporated in the MAO micropores and in the top EP layer. The influence of the strategic positioning of the nanocontainers on the corrosion protective performance of coating was investigated. The experimental results and analysis indicated that the superior corrosion resistance of the hybrid coating is ascribed to the protection mechanisms of the nanocontainers. This involves two phenomena:(1) the presence of the nanocontainers in the MAO micropores decreased the distance between MSN@SB and the substrate, demonstrating a low admittance value(^5.18 × 10^(-8)Ω^(-1)), and thus exhibiting significant corrosion inhibition and self-healing function;and(2) the addition of nanocontainers in the top EP layer densified the coating via sealing of the inherent defects, and hence the coating maintained higher resistance even after 90 days of immersion(1.13 × 10^(10)Ω cm^(2)).However, the possibility of corrosion inhibitors located away from the substrate transport to the substrate is reduced, reducing its effective utilization rate. This work demonstrates the importance of the positioning of nanocontainers in the coating for enhanced corrosion resistance,and thereby providing a novel perspective for the design of smart protective coatings through regulating the distribution of nanocontainers in the coatings.展开更多
In-situ incorporation of layered double hydroxides(LDH)nanocontainers into plasma electrolytic oxidation(PEO)coatings on AZ91 Mg alloy has been achieved in the present study.Fumarate was selected as Mg corrosion inhib...In-situ incorporation of layered double hydroxides(LDH)nanocontainers into plasma electrolytic oxidation(PEO)coatings on AZ91 Mg alloy has been achieved in the present study.Fumarate was selected as Mg corrosion inhibitor for exchange and intercalation into the nanocontainers,which were subsequently incorporated into the coating.It was found that the thickness and compactness of the coatings were increased in the presence of LDH nanocontainers.The corrosion protection performance of the blank PEO,LDH containing PEO and inhibitor loaded coatings was evaluated by means of polarization test and electrochemical impedance spectroscopy(EIS).The degradation process and corrosion resistance of PEO coating were found to be greatly affected by the loaded inhibitor and nanocontainers by means of ion-exchange when corrosion occurs,leading to enhanced and stable corrosion resistance of the substrate.展开更多
Smart coating for corrosion protection of metal materials(steel,magnesium,aluminum and their alloys)has drawn great attention because of their capacity to prevent crack propagation in the protective coating by releasi...Smart coating for corrosion protection of metal materials(steel,magnesium,aluminum and their alloys)has drawn great attention because of their capacity to prevent crack propagation in the protective coating by releasing functional molecules(healing agents or corrosion inhibitors)on demand from delivery vehicle,that is,micro/nanocontainer made up of a shell and core material or a coating layer,in a controllable manner.Herein,we summarize the recent achievements during the last 10 years in the field of the micro/nanocontainer with different types of stimuli-responsive properties,i.e.,pH,electrochemical potential,redox,aggressive corrosive ions,heat,light,magnetic field,and mechanical impact,for smart anticorrosion coating.The state-of-the-art design and fabrication of micro/nanocontainer are emphasized with detailed examples.展开更多
Metallic corrosion can lead to both economic losses and environmental pollution due to undesired chemical and biochemical reactions.Furthermore,there are a number of drawbacks associated with different corrosion preve...Metallic corrosion can lead to both economic losses and environmental pollution due to undesired chemical and biochemical reactions.Furthermore,there are a number of drawbacks associated with different corrosion prevention and mitigation techniques.In view of these challenges,corrosion inhibitor-based smart micro/nanocontainers(CISCs)with stimuli-responsive functionality emerge as an important alternative technical approach in dealing with metallic corrosion.The development of CISCs involves controlled release corrosion inhibitors and self-healing coatings.This review focuses on the trigger and response mechanisms of controlling the discharge of corrosion inhibitors from micro/nanocontainers(a core-shell or layered structure)into aqueous solution under endogenous(pH,redox,and ion-exchange).exogenous(temperature,magnetic field,and light),and multiple stimuli.When these CISCs are embedded into coating materials,the self-healing effect of the coating can manifest to protect various types of metals.In this review effort,different types of CISCs are classified for the first time into the following three categories:inorganic,organic,and organic-inorganic hybrid.We also discuss application scope,future perspectives,and research strategies for CISCs in the hopes of increasing the life of corrosion protection and providing inspiration in related fields.展开更多
A TiO_(2)@o-vanillin@TEOS-APTES nanocontainer was prepared by an experimental process in which,firstly,2-hydroxy-3-methoxybenzaldehyde(o-vanillin)was loaded in a TiO_(2) container to obtain TiO_(2)@o-vanillin.Then,TiO...A TiO_(2)@o-vanillin@TEOS-APTES nanocontainer was prepared by an experimental process in which,firstly,2-hydroxy-3-methoxybenzaldehyde(o-vanillin)was loaded in a TiO_(2) container to obtain TiO_(2)@o-vanillin.Then,TiO_(2)@o-vanillin was encapsulated by tetraethyl orthosilicate(TEOS).Finally,3-aminopropyl triethoxysilane(APTES)was used to modify the obtained sample.The morphology,structural phase and thermal stability of the TiO_(2)@o-vanillin@TEOS-APTES nanocontainer were analyzed using scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR),X-ray diffractometry(XRD)and thermal gravimetric analysis(TG).The release rate of o-vanillin was investigated using an ultraviolet-visible(UV-vis)spectrometer.The anti-corrosion performances of the epoxy,epoxy@o-vanillin and epoxy@TiO_(2)@o-vanillin@TEOS-APTES coatings on steel sheets were evaluated using an electrochemical method and scarification experiments.The results showed that the impedance value of the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating was two orders of magnitude higher than that of the blank epoxy coating,and one order of magnitude higher than that of the epoxy@o-vanillin coating.The maximum inhibition rate of the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating on the steel can reach 97.3%.The scarification experiments confirmed that the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating had the best anti-corrosion performance.展开更多
基金the financial support from the graduate research and innovation foundation of Chongqing, China (Grant No. CYB25021)National Natural Science Foundation of China (Grants No 52378217 and 52302220)+1 种基金the Fundamental Research Funds for the Central Universities (Grant No 2024CDJQYJCYJ-001)the Special Fund of Taishan Industry Leading Talents Project.
文摘Nowadays,despite advancements in anticorrosion technologies,the application of magnesium(Mg)alloys in marine environments continues to encounter significant challenges in corrosion protection against biofouling.Given the limitations of single-component materials,achieving a synergistic protective effect is a critical requirement.This study proposes a multistage slow-release system to fabricate a composite of multistage nanocontainers based on a three-dimensional(3D)bio-template.Specifically,the design integrates the coupling of multiple nanocontainers to leverage the synergistic effects of multistage retardation.The M-CeO_(2)-LDH/DE coating leverages the porous loading capability of DE,the responsive release function of LDH,and the redox activity of CeO_(2),resulting in a significant enhancement of anticorrosion performance while effectively inhibiting the adhesion of sulfate-reducing bacteria(SRB)and Chlorella vulgaris.Furthermore,the study elucidates the effects of multistage nanocontainers on the anticorrosion and antifouling properties of magnesium alloy coatings,as well as the potential mechanism for multistage slow-release protection.As a result,the coating achieved an antimicrobial efficiency of 98.85%at a corrosion inhibitor loading of 24.9 wt.%,while the corrosion current density at the scratches decreased from 25.2μA·cm^(−2)to-12.5μA·cm^(−2).The M-CeO_(2)-LDH/DE coating integrates highly effective corrosion resistance,biofouling protection,and excellent mechanical properties.DFT calculations model the varying adsorption behavior of 2-MBI and confirm the multistage release mechanism of the nanocontainer for the corrosion inhibitor.This study not only introduces innovative strategies for developing high-performance protective coatings but also establishes a robust foundation for the broader application of magnesium alloys in marine environments,underscoring their significant potential for engineering applications.
基金financially supported by the National Natu-ral Science Foundation of China(Nos.52204066 and 52474020)the Shandong Province Youth Entrepreneurship Technology Sup-port Program for Higher Education Institutions(No.2023KJ060)the Fundamental Research Funds for the Central Universities(No.23CX06018A).
文摘Responsive nanocontainers have dual functions in targeted delivery of corrosion inhibitors and emulsion development of shale oil in oil and gas fields,exhibiting potential for simultaneously achieving metal protection and efficient oil and gas development from a material perspective.Here,we propose the preparation of a pH-responsive nanocontainer,HMSNs-g-PDEAEMA(poly[2-(N,N-diethyl amino)ethyl-methacrylate](PDEAEMA)grafted onto hollow mesoporous spherical silica(HMSNs)),to integrate the delivery of 2-mercaptobenzothiazole(MBT)for targeted corrosion inhibition and the emulsification of oil as Pickering emulsifiers.Under acidic conditions(reduced pH value caused by localized corrosion or high concentration acidic gases),PDEAEMA chains are protonated and extended by electrostatic repulsion,exposing pores on HMSNs surface and allowing the controlled release of loaded MBT molecules.Once transforming into a neutral or alkaline environment,the responsive release of the MBT process is inhibited.After the fluid passes through the wellbore and enters the shale layer,the HMSNs-g-PDEAEMA nanocontainers act as Pickering emulsifiers to achieve emulsification.The emulsified oil can be extracted onto the ground more efficiently,and a following pH-responsive demulsification process can be achieved.Overall,through a pH-responsive nanocontainer material,the dual function of corrosion inhibition and emulsification in oil and gas development is possible to be simultaneously achieved.
基金Sichuan Science and Technology Program(2018JY0483)Young Elite Scientists Sponsorship Program by China Association for Science and Technology(YESS,2018QNRC001)+4 种基金Natural Science Foundation of Hunan Province(2020JJ4073)Open Project of Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province(CSPC202004)Foundation of Huaihua University Double First-rate Applied Characteristic Discipline Construction Projects of Materials Science and Engineering(19CKA002)the Fundamental Research Funds of China West Normal University(CXTD2020-1)the support from the National Science Foundation(CHE 1566283)。
文摘The preparation of pH-responsive nanocontainers by typical silane modification of the mesoporous silica nanoparticle(MSN)surface is usually high-cost,complex,and time-consuming,which remains a great challenge for effective corrosion protection of magnesium alloy.Here,a new strategy to construct pH-responsive nanocontainers(MSN-MBT@LDH)is demonstrated.The nanocontainers consist of corrosion inhibitor(2-mercaptobenzothiazole,MBT)loaded MSN core and layered double hydroxide(LDH)nanosheet shell serving as gatekeepers.The successful loading of MBT and encapsulation by LDH nanosheets were confirmed by a series of characterization such as scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy(STEM-EDS)and N2 adsorption/desorption isotherms.The pH-responsive feature of the nanocontainers was demonstrated by determination of the MBT concentration in buffer solutions with different pH values.A smart corrosion protection system on Mg alloy is obtained by incorporating the synthesized nanocontainers into a self-assembled nanophase particle(SNAP)coating.The electrochemical tests and visual observations show that the hybrid coating has the best barrier properties and robustness in corrosion protection in NaCl corrosive solutions in comparison with the control coatings.The present method simplifies the synthesis processes of nanocontainers and eliminates the potential detrimental effect of excess gatekeepers on the coating.The findings provide new insights into the preparation of scalable nanocontainers.The self-healing coatings are expected to have widespread applications for corrosion protection of Mg alloy and other metals.
文摘Polymer nanocomposite coatings(PNCCs)are unprecedented generation of coatings engineered for displaying inexpensive and brilliant functional surface coatings with eminent corrosion guard,mechanical resistance,antimicrobial,chemical durability,electrical insulation,and UV aging features.Due to their widely anticipation in petroleum,applications in building,conveyance,aerospace,electronics,automobiles and energy,these multi-functional coatings have a tremendous leverage in human life,all technological and scientific subjects.Numerous applications have been made for multilateral polymers like polyurethane(PU),epoxy(EP),polyaniline(PANI)conductive polymer,polypyrrole(PPy),and etc,on various metallic surfaces especially,carbon steel substrate owing to their excellent resistance properties.Practically,nanomaterials can possess potential in the all-interdisciplinary domains of materials science and engineering,chemical and physical sciences,biological and health sciences.As known,the designed polymer nanocomposite coating paradigm is fundamentally constituted from polymer or resin as a vehicle and inorganic nanofillers(nanoparticles and nanocomposites).Some commercialized and excessively employed nanocontainers in polymer nanocomposite coating formulations,like ZnO,TiO_(2),carbon nanotubes(CNTs),clay,SiO_(2),Al_(2)O_(3),graphene,GO,CeO_(2),ZrO_(2),FeTiO_(3),etc were discussed.The current review covered the chemistry and potential applications of the largest utilized multifunctional polymer nanocomposite coatings such as EP,PU and other considerable PNCCs.Lately,a titanic attention was made for epoxy nanocomposites because of their distinct physicochemical characteristics,which result from the combined qualities of the nanoparticles and polymer material unity.In addition,the author incorporated some of his scientific contributions in this area represented in construction of innovative functional polymer nanocomposites for a variety of uses with high economic,industrial impacts and future orientation.Furthermore,some newly published applications of polymer nanocomposite coatings were incorporated and discussed.
基金appreciate the financial support by the National Natural Science Foundation of China (52071191,52201077)the Natural Science Foundation of Shandong Province (ZR2022QE191)+1 种基金Elite Scheme of Shandong University of Science and Technology (0104060541123)Talent introduction and Research Start-up Fund of Shandong University of Science and Technology (0104060510124)。
文摘Smart micro-arc oxidation(MAO)/epoxy resin(EP) composite coatings were formed on AZ31 magnesium(Mg) alloy. Mesoporous silica nanocontainers(MSN) encapsulated with sodium benzoate(SB) corrosion inhibitors were strategically incorporated in the MAO micropores and in the top EP layer. The influence of the strategic positioning of the nanocontainers on the corrosion protective performance of coating was investigated. The experimental results and analysis indicated that the superior corrosion resistance of the hybrid coating is ascribed to the protection mechanisms of the nanocontainers. This involves two phenomena:(1) the presence of the nanocontainers in the MAO micropores decreased the distance between MSN@SB and the substrate, demonstrating a low admittance value(^5.18 × 10^(-8)Ω^(-1)), and thus exhibiting significant corrosion inhibition and self-healing function;and(2) the addition of nanocontainers in the top EP layer densified the coating via sealing of the inherent defects, and hence the coating maintained higher resistance even after 90 days of immersion(1.13 × 10^(10)Ω cm^(2)).However, the possibility of corrosion inhibitors located away from the substrate transport to the substrate is reduced, reducing its effective utilization rate. This work demonstrates the importance of the positioning of nanocontainers in the coating for enhanced corrosion resistance,and thereby providing a novel perspective for the design of smart protective coatings through regulating the distribution of nanocontainers in the coatings.
基金support from National Natural Science Foundation of China(No.52071067 and U1737102)Mobility Programme of the Sino-German Center(M-0056)+1 种基金the Fundamental Research Funds for the Central Universities(N2002009)FUNCOAT project(H2020-MSCA-RISE-2018,Grant Agreement N 823942).
文摘In-situ incorporation of layered double hydroxides(LDH)nanocontainers into plasma electrolytic oxidation(PEO)coatings on AZ91 Mg alloy has been achieved in the present study.Fumarate was selected as Mg corrosion inhibitor for exchange and intercalation into the nanocontainers,which were subsequently incorporated into the coating.It was found that the thickness and compactness of the coatings were increased in the presence of LDH nanocontainers.The corrosion protection performance of the blank PEO,LDH containing PEO and inhibitor loaded coatings was evaluated by means of polarization test and electrochemical impedance spectroscopy(EIS).The degradation process and corrosion resistance of PEO coating were found to be greatly affected by the loaded inhibitor and nanocontainers by means of ion-exchange when corrosion occurs,leading to enhanced and stable corrosion resistance of the substrate.
基金the National Natural Science Foundation of China (Nos.41576079,41922040)the Qingdao National Laboratory for Marine Science and Technology (No.QNLM20160RP0413)the AoShan Talent Program Supported by Qingdao National Laboratory for Marine Science and Technology (No.2017ASTCP-ES02)
文摘Smart coating for corrosion protection of metal materials(steel,magnesium,aluminum and their alloys)has drawn great attention because of their capacity to prevent crack propagation in the protective coating by releasing functional molecules(healing agents or corrosion inhibitors)on demand from delivery vehicle,that is,micro/nanocontainer made up of a shell and core material or a coating layer,in a controllable manner.Herein,we summarize the recent achievements during the last 10 years in the field of the micro/nanocontainer with different types of stimuli-responsive properties,i.e.,pH,electrochemical potential,redox,aggressive corrosive ions,heat,light,magnetic field,and mechanical impact,for smart anticorrosion coating.The state-of-the-art design and fabrication of micro/nanocontainer are emphasized with detailed examples.
基金Fundings from the National Key Research and Development Program of China(2019YFE0111000)the Science and Technology Development Fund,Macao S.A.R(FDCT)(FDCT/0024/2019/AMJ)the National Natural Science Foundation of China(51903257 and 21906188)。
文摘Metallic corrosion can lead to both economic losses and environmental pollution due to undesired chemical and biochemical reactions.Furthermore,there are a number of drawbacks associated with different corrosion prevention and mitigation techniques.In view of these challenges,corrosion inhibitor-based smart micro/nanocontainers(CISCs)with stimuli-responsive functionality emerge as an important alternative technical approach in dealing with metallic corrosion.The development of CISCs involves controlled release corrosion inhibitors and self-healing coatings.This review focuses on the trigger and response mechanisms of controlling the discharge of corrosion inhibitors from micro/nanocontainers(a core-shell or layered structure)into aqueous solution under endogenous(pH,redox,and ion-exchange).exogenous(temperature,magnetic field,and light),and multiple stimuli.When these CISCs are embedded into coating materials,the self-healing effect of the coating can manifest to protect various types of metals.In this review effort,different types of CISCs are classified for the first time into the following three categories:inorganic,organic,and organic-inorganic hybrid.We also discuss application scope,future perspectives,and research strategies for CISCs in the hopes of increasing the life of corrosion protection and providing inspiration in related fields.
基金supported by the National Natural Science Foundation of China(21878024)the Innovation Team Project of Colleges and Universities in Liaoning Province(2018479-14,LT2015001).
文摘A TiO_(2)@o-vanillin@TEOS-APTES nanocontainer was prepared by an experimental process in which,firstly,2-hydroxy-3-methoxybenzaldehyde(o-vanillin)was loaded in a TiO_(2) container to obtain TiO_(2)@o-vanillin.Then,TiO_(2)@o-vanillin was encapsulated by tetraethyl orthosilicate(TEOS).Finally,3-aminopropyl triethoxysilane(APTES)was used to modify the obtained sample.The morphology,structural phase and thermal stability of the TiO_(2)@o-vanillin@TEOS-APTES nanocontainer were analyzed using scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR),X-ray diffractometry(XRD)and thermal gravimetric analysis(TG).The release rate of o-vanillin was investigated using an ultraviolet-visible(UV-vis)spectrometer.The anti-corrosion performances of the epoxy,epoxy@o-vanillin and epoxy@TiO_(2)@o-vanillin@TEOS-APTES coatings on steel sheets were evaluated using an electrochemical method and scarification experiments.The results showed that the impedance value of the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating was two orders of magnitude higher than that of the blank epoxy coating,and one order of magnitude higher than that of the epoxy@o-vanillin coating.The maximum inhibition rate of the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating on the steel can reach 97.3%.The scarification experiments confirmed that the epoxy@TiO_(2)@o-vanillin@TEOS-APTES coating had the best anti-corrosion performance.
