The current distributions over carbon steel under iron red alkyd primer exposed to 3.5% sodium chloride solution were mapped using the wire beam electrode （WBE）. The electrochemical impedance spectroscopy （EIS） of...The current distributions over carbon steel under iron red alkyd primer exposed to 3.5% sodium chloride solution were mapped using the wire beam electrode （WBE）. The electrochemical impedance spectroscopy （EIS） of the WBE was carded out to analyze the performance of coating delamination and corrosion behavior of carbon steel beneath defective coating. The EIS data revealed that protective capability of coating decreased with immersion time and the degree of cathodic delamination showed a rapid rise. The current density distribution of WBE indicated that cathodic sites was located at the defect at the beginning of immersion and gradually spread into the intact coating. The cathodic regions were distinguished from the anodic area and distributed over the WBE. The changes of cathodic sites could reflect the deterioration process of defective coating. The cathodic area ratio was a more useful parameter than the cathodic delamination degree to evaluate the coating cathodic delamination. The polarity reversals of electrodes at the defect and beneath coating were observed. A simple discussion of relationship between the blister and the polarity reversal was made from a standpoint of electrochemical distribution. WBE method was able to map and record the changes of local cathodic sites beneath defective coating in real time, which could provide more detailed information about the local degradation of coating.展开更多
A novel method based on mid-frequency vibration is proposed to eliminate coating defects such as bubbles during electroless nickel plating.An automated control system for the plating,enabling precise and stable measur...A novel method based on mid-frequency vibration is proposed to eliminate coating defects such as bubbles during electroless nickel plating.An automated control system for the plating,enabling precise and stable measurements and adjustments of critical parameters such as plating solution temperature,pH,and nickel ion concentration,is also established,which significantly improves process efficiency and coating quality.Experimental results indicate that the system is capable of realizing stable operation over extended periods.A nonporous nickel-phosphorus coating with a thickness greater than 200μm is successfully obtained,with high phosphorus content,robust adhesion,and superior machinability.展开更多
NiMnO3 perovskite catalysts supported on cordierite modified by CexZr（1-x）O2 coatings were prepared using impregnation and sol-gel methods for catalytic combustion of single/double component VOCs at different concen...NiMnO3 perovskite catalysts supported on cordierite modified by CexZr（1-x）O2 coatings were prepared using impregnation and sol-gel methods for catalytic combustion of single/double component VOCs at different concentrations and GHSV of 15,000 h^（-1）, which were characterized by BET, XRD, SEM, FT-IR, H2-TPR and O2-TPD. After coating modification, the specific surface area of catalysts is improved obviously.Among the catalysts, the Ce（0.75）Zr（0.25）O2 coating modified NiMnO3 catalyst exhibits the best catalytic activity for VOCs combustion with 95.6% conversion at 275 ℃ and has stable activity when catalyst is embalmed at 800 ℃. In addition, the catalyst also presents the excellent water-resistant and conversion stability over time-on-stream condition. The reason is that Ce（0.75）Zr（0.25）O2 coating can promote more lattice distortion and defects and smaller crystal size, which improve oxygen transfer capability and dispersion of active component.展开更多
Corrosion significantly impacts the integrity of steel structures,making them more prone to damage and failure.Coating the steel surface with anti-corrosion paint is a prevalent method.Nevertheless,these coatings are ...Corrosion significantly impacts the integrity of steel structures,making them more prone to damage and failure.Coating the steel surface with anti-corrosion paint is a prevalent method.Nevertheless,these coatings are susceptible to damage,and corrosion tends to initiate at and spread from the damaged points,potentially leading to severe localized deterioration.Accurately predicting the progression of corrosion and coating deterioration at these critical points is essential for effective maintenance of steel structures.This study focused on two different paint-coatings applied to SM400 steel,onto which defects of varied sizes and shapes were artificially induced to mimic real-world paint-coating damage.These specimens underwent the accelerated corrosion test(ISO 16539 Method B)to generate data on corrosion depth at various time intervals.Subsequently,a modified generative adversarial network(GAN)model was employed to develop a highly accurate prediction model for the deterioration of steel surfaces,where the inputs to the model are four sequential corrosion depth measurements,and the output is the predicted future corrosion depth distribution.The performance of the proposed model was quantitatively evaluated using the root mean square error(RMSE).The model demonstrated outstanding predictive accuracy across all defect scenarios presented in this study.Compared with both traditional GAN variants(Conditional GAN and Information Maximizing GAN),the proposed model demonstrated a lower RMSE in predictive accuracy.This finding underscores its capability for precise corrosion prediction in steel structures,even with a relatively small data set.This predictive capability holds significant potential for predictive maintenance and failure analysis in steel infrastructure.This study not only validates the use of GAN in predictive maintenance but also provides a novel approach for the early detection and management of corrosion,crucial for extending the lifespan of critical infrastructure.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 51131005)
文摘The current distributions over carbon steel under iron red alkyd primer exposed to 3.5% sodium chloride solution were mapped using the wire beam electrode （WBE）. The electrochemical impedance spectroscopy （EIS） of the WBE was carded out to analyze the performance of coating delamination and corrosion behavior of carbon steel beneath defective coating. The EIS data revealed that protective capability of coating decreased with immersion time and the degree of cathodic delamination showed a rapid rise. The current density distribution of WBE indicated that cathodic sites was located at the defect at the beginning of immersion and gradually spread into the intact coating. The cathodic regions were distinguished from the anodic area and distributed over the WBE. The changes of cathodic sites could reflect the deterioration process of defective coating. The cathodic area ratio was a more useful parameter than the cathodic delamination degree to evaluate the coating cathodic delamination. The polarity reversals of electrodes at the defect and beneath coating were observed. A simple discussion of relationship between the blister and the polarity reversal was made from a standpoint of electrochemical distribution. WBE method was able to map and record the changes of local cathodic sites beneath defective coating in real time, which could provide more detailed information about the local degradation of coating.
基金supported by the National Key Research and Development Program of China(Grant No.2023YFB3407200)the National Natural Science Foundation of China(Grant Nos.52375462 and 52035009).
文摘A novel method based on mid-frequency vibration is proposed to eliminate coating defects such as bubbles during electroless nickel plating.An automated control system for the plating,enabling precise and stable measurements and adjustments of critical parameters such as plating solution temperature,pH,and nickel ion concentration,is also established,which significantly improves process efficiency and coating quality.Experimental results indicate that the system is capable of realizing stable operation over extended periods.A nonporous nickel-phosphorus coating with a thickness greater than 200μm is successfully obtained,with high phosphorus content,robust adhesion,and superior machinability.
基金Project supported by the Science and Technology Department of Jiangsu Province(BE2016769)the Natural Science Foundation of China(51172107)+2 种基金Natural Science Foundation of the Jiangsu Higher Education Institutions of China(14KJB430014)Open fund by Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials(KFK1503)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘NiMnO3 perovskite catalysts supported on cordierite modified by CexZr（1-x）O2 coatings were prepared using impregnation and sol-gel methods for catalytic combustion of single/double component VOCs at different concentrations and GHSV of 15,000 h^（-1）, which were characterized by BET, XRD, SEM, FT-IR, H2-TPR and O2-TPD. After coating modification, the specific surface area of catalysts is improved obviously.Among the catalysts, the Ce（0.75）Zr（0.25）O2 coating modified NiMnO3 catalyst exhibits the best catalytic activity for VOCs combustion with 95.6% conversion at 275 ℃ and has stable activity when catalyst is embalmed at 800 ℃. In addition, the catalyst also presents the excellent water-resistant and conversion stability over time-on-stream condition. The reason is that Ce（0.75）Zr（0.25）O2 coating can promote more lattice distortion and defects and smaller crystal size, which improve oxygen transfer capability and dispersion of active component.
文摘Corrosion significantly impacts the integrity of steel structures,making them more prone to damage and failure.Coating the steel surface with anti-corrosion paint is a prevalent method.Nevertheless,these coatings are susceptible to damage,and corrosion tends to initiate at and spread from the damaged points,potentially leading to severe localized deterioration.Accurately predicting the progression of corrosion and coating deterioration at these critical points is essential for effective maintenance of steel structures.This study focused on two different paint-coatings applied to SM400 steel,onto which defects of varied sizes and shapes were artificially induced to mimic real-world paint-coating damage.These specimens underwent the accelerated corrosion test(ISO 16539 Method B)to generate data on corrosion depth at various time intervals.Subsequently,a modified generative adversarial network(GAN)model was employed to develop a highly accurate prediction model for the deterioration of steel surfaces,where the inputs to the model are four sequential corrosion depth measurements,and the output is the predicted future corrosion depth distribution.The performance of the proposed model was quantitatively evaluated using the root mean square error(RMSE).The model demonstrated outstanding predictive accuracy across all defect scenarios presented in this study.Compared with both traditional GAN variants(Conditional GAN and Information Maximizing GAN),the proposed model demonstrated a lower RMSE in predictive accuracy.This finding underscores its capability for precise corrosion prediction in steel structures,even with a relatively small data set.This predictive capability holds significant potential for predictive maintenance and failure analysis in steel infrastructure.This study not only validates the use of GAN in predictive maintenance but also provides a novel approach for the early detection and management of corrosion,crucial for extending the lifespan of critical infrastructure.
