Despite significant advancements in microwave absorption materials(MAMs)for electromagnetic interference mitigation,the integration of robust microwave absorption(MA)and corrosion resistance into a unified system rema...Despite significant advancements in microwave absorption materials(MAMs)for electromagnetic interference mitigation,the integration of robust microwave absorption(MA)and corrosion resistance into a unified system remains a critical challenge,particularly for long-term durability in harsh environments.Conventional approaches relying on multiphase composites often suffer from compromised functionality due to intrinsic property conflicts between absorption and anti-corrosion components.Here,we propose an integrated design strategy of active-passive corrosion inhibition and MA to design composite volatile corrosion inhibition coatings with synergistic dielectric attenuation and multiple corrosion protection effects.Dielectric property modulation strategy-based,we achieved precise modulation of permittivity gradients and interfacial polarization for RGO/FCIP@SiO_(2),resulting in optimal impedance matching and record-breaking MA performance:a minimal reflection loss(RL_(min))of-68 dB at 12.82 GHz with a 7 GHz effective absorption bandwidth(EAB)at 2.0 mm thickness.Moreover,the two-dimensional lamellar reduced graphene oxide(RGO)has a“maze effect”and superhydrophobic architecture(162.3°contact angle)to passively defend against corrosive media.Concurrently,the multicomponent volatile corrosion inhibitor(BGC)system endows the composite with exceptional active corrosion inhibition.Through the dynamic anti-corrosion process involving vapor-phase release,surface adsorption,and protective film formation of corrosion inhibitor molecules,this system significantly enhances corrosion protection.Remarkably,it maintains 99.36%corrosion inhibition efficiency after 360-hour salt spray exposure and 25 friction cycles,without MA performance degradation.展开更多
Based on the results of slot milling experiments on the DD5 Ni-based single crystal superalloy(001) crystal plane along the [110]crystal direction, in this paper, efforts were devoted to investigate the tool wear proc...Based on the results of slot milling experiments on the DD5 Ni-based single crystal superalloy(001) crystal plane along the [110]crystal direction, in this paper, efforts were devoted to investigate the tool wear process, wear mechanism and failure modes of the physical vapor deposition(PVD)-AlTiN and TiAlN coated tools under dry milling and water-based minimum quantity lubrication(MQL) conditions. The scanning electron microscope(SEM) morphological observation and energy dispersive X-ray spectroscopy(EDX) elements analysis methods were adopted. Moreover, under the water-based MQL condition, the surface integrity such as surface roughness, dimensional and shape accuracy, microhardness and microstructure alteration were researched. The results demonstrated that the tool edge severe adhesion with the work material, induced by the high Al content in the PVD-AlTiN coating caused the catastrophic tool tip fracture. In contrast, the PVD-TiAlN tool displayed a steady and uniform minor flank wear, even though the material peeling and slight chipping also occurred in the final stage. In addition, due to the high effective cooling and lubricating actions of the water-based MQL method, the PVD-TiAlN coated tool demonstrated intact tip geometry; consequently it could be repaired and reused even if the failure criterion was attained. Moreover, as the accumulative milling length and the tool wear increased, all indicators of the surface integrity forehand were deteriorated.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52472305,52173265,52302087, 52403049)the Science and Technology Planning Project of Sichuan Province(No.2023NSFSC1952)the Fundamental Research Funds for the Central Universities(No.2682021GF004)to freely explore basic research projects.
文摘Despite significant advancements in microwave absorption materials(MAMs)for electromagnetic interference mitigation,the integration of robust microwave absorption(MA)and corrosion resistance into a unified system remains a critical challenge,particularly for long-term durability in harsh environments.Conventional approaches relying on multiphase composites often suffer from compromised functionality due to intrinsic property conflicts between absorption and anti-corrosion components.Here,we propose an integrated design strategy of active-passive corrosion inhibition and MA to design composite volatile corrosion inhibition coatings with synergistic dielectric attenuation and multiple corrosion protection effects.Dielectric property modulation strategy-based,we achieved precise modulation of permittivity gradients and interfacial polarization for RGO/FCIP@SiO_(2),resulting in optimal impedance matching and record-breaking MA performance:a minimal reflection loss(RL_(min))of-68 dB at 12.82 GHz with a 7 GHz effective absorption bandwidth(EAB)at 2.0 mm thickness.Moreover,the two-dimensional lamellar reduced graphene oxide(RGO)has a“maze effect”and superhydrophobic architecture(162.3°contact angle)to passively defend against corrosive media.Concurrently,the multicomponent volatile corrosion inhibitor(BGC)system endows the composite with exceptional active corrosion inhibition.Through the dynamic anti-corrosion process involving vapor-phase release,surface adsorption,and protective film formation of corrosion inhibitor molecules,this system significantly enhances corrosion protection.Remarkably,it maintains 99.36%corrosion inhibition efficiency after 360-hour salt spray exposure and 25 friction cycles,without MA performance degradation.
基金supported by the National Natural Science Foundation of China(Grant No.51375082)
文摘Based on the results of slot milling experiments on the DD5 Ni-based single crystal superalloy(001) crystal plane along the [110]crystal direction, in this paper, efforts were devoted to investigate the tool wear process, wear mechanism and failure modes of the physical vapor deposition(PVD)-AlTiN and TiAlN coated tools under dry milling and water-based minimum quantity lubrication(MQL) conditions. The scanning electron microscope(SEM) morphological observation and energy dispersive X-ray spectroscopy(EDX) elements analysis methods were adopted. Moreover, under the water-based MQL condition, the surface integrity such as surface roughness, dimensional and shape accuracy, microhardness and microstructure alteration were researched. The results demonstrated that the tool edge severe adhesion with the work material, induced by the high Al content in the PVD-AlTiN coating caused the catastrophic tool tip fracture. In contrast, the PVD-TiAlN tool displayed a steady and uniform minor flank wear, even though the material peeling and slight chipping also occurred in the final stage. In addition, due to the high effective cooling and lubricating actions of the water-based MQL method, the PVD-TiAlN coated tool demonstrated intact tip geometry; consequently it could be repaired and reused even if the failure criterion was attained. Moreover, as the accumulative milling length and the tool wear increased, all indicators of the surface integrity forehand were deteriorated.
