Multiphase Interfacial Regulation Based on Hierarchical Porous Molybdenum Selenide to Build Anticorrosive and Multiband Tailorable Absorbers

Electromagnetic wave(EMW)absorbing materials have an irreplaceable position in the field of military stealth as well as in the field of electromagnetic pollution control.And in order to cope with the complex electromagnetic environment,the design of multifunctional and multiband high efficiency EMW absorbers remains a tremendous challenge.In this work,we designed a three-dimensional porous structure via the salt melt synthesis strategy to optimize the impedance matching of the absorber.Also,through interfacial engineering,a molybdenum carbide transition layer was introduced between the molybdenum selenide nanoparticles and the three-dimensional porous carbon matrix to improve the absorption behavior of the absorber.The analysis indicates that the number and components of the heterogeneous interfaces have a significant impact on the EMW absorption performance of the absorber due to mechanisms such as interfacial polarization and conduction loss introduced by interfacial engineering.Wherein,the prepared MoSe_(2)/MoC/PNC composites showed excellent EMW absorption performance in C,X,and Ku bands,especially exhibiting a reflection loss of−59.09 dB and an effective absorption bandwidth of 6.96 GHz at 1.9 mm.The coordination between structure and components endows the absorber with strong absorption,broad bandwidth,thin thickness,and multi-frequency absorption characteristics.Remarkably,it can effectively reinforce the marine anticorrosion property of the epoxy resin coating on Q235 steel substrate.This study contributes to a deeper understanding of the relationship between interfacial engineering and the performance of EMW absorbers,and provides a reference for the design of multifunctional,multiband EMW absorption materials.

Optimizing Heavy-duty Anticorrosive Performances of Coating Films Formed by Acrylate-vinylidene Chloride Copolymer Latexes through Twice-painting Technique

Twice-painting technique was adopted to prepare heavy-duty anticorrosive coating films formed by aqueous latexes of copolymers of vinylidene chloride（VDC） with an acrylate, namely methyl acrylate（MA）, ethyl acrylate（EA）, butyl acrylate（BA） or 2-ethylhexyl acrylate（EHA）. Harsh salt-spray corrosion tests demonstrated that the optimized twicepainting technique was that the acidic latex solution was adjusted to p H 5-6 for the first painting, while it was utilized directly for the second painting. The test of 600 h of harsh salt-spray corrosion showed that MA-VDC85 coating could protect the steel excellently, whereas the other acrylate-VDC coatings with 75%-90% VDC content could not protect the steel so effectively. Further corrosion test showed that（1） MA-VDC85 coating protected steel from loss of metallic luster for at least 1000 h of salt-spray corrosion;（2） adhesion of MA-VDC85 coating to steel was excellent for at least 800 h of saltspray corrosion, but became very poor after 1000 h. Differential scanning calorimetry, thermogravimetric analysis, X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy were used to evaluate the corroded MA-VDC85 film.

Anticorrosive and antibacterial smart integrated strategy for biomedical magnesium

Biomedical magnesium is an ideal material for hard tissue repair and replacement.However,its rapid degradation and infection after implantation significantly hindersclinical applications.To overcome these two critical drawbacks,we describe an integrated strategybased on the changes in pH and Mg^(2+)triggered by magnesiumdegradation.This system can simultaneously offer anticorrosion and antibacterial activity.First,nanoengineered peptide-grafted hyperbranched polymers(NPGHPs)with excellent antibacterial activity were introduced to sodium alginate(SA)to construct a sensitive NPGHPs/SA hydrogel.The swelling degree,responsiveness,and antibacterial activity were then investigated,indicating that the system can perform dual stimulation of pH and Mg^(2+)with controllable antimicrobial properties.Furthermore,an intelligent platform was constructed by coating hydrogels on magnesium with polydopamine as the transition layer.The alkaline environment generated by the corrosion of magnesium reduces the swelling degree of the coatingso that the liquid is unfavorable for contacting the substrate,thus exhibiting superior corrosion resistance.Antibacterial testing shows that the material can effectively fight against bacteria,while hemolytic and cytotoxicity testing suggest that it is highly biocompatible.Thus,this work realizes the smart integration of anticorrosion and antibacterial properties of biomedical magnesium,thereby providing broader prospects for the use of magnesium.

Real-Time Co-optimization of Gear Shifting and Engine Torque for Predictive Cruise Control of Heavy-Duty Trucks

Fuel consumption is one of the main concerns for heavy-duty trucks.Predictive cruise control(PCC)provides an intriguing opportunity to reduce fuel consumption by using the upcoming road information.In this study,a real-time implementable PCC,which simultaneously optimizes engine torque and gear shifting,is proposed for heavy-duty trucks.To minimize fuel consumption,the problem of the PCC is formulated as a nonlinear model predictive control(MPC),in which the upcoming road elevation information is used.Finding the solution of the nonlinear MPC is time consuming;thus,a real-time implementable solver is developed based on Pontryagin’s maximum principle and indirect shooting method.Dynamic programming(DP)algorithm,as a global optimization algorithm,is used as a performance benchmark for the proposed solver.Simulation,hardware-in-the-loop and real-truck experiments are conducted to verify the performance of the proposed controller.The results demonstrate that the MPC-based solution performs nearly as well as the DP-based solution,with less than 1%deviation for testing roads.Moreover,the proposed co-optimization controller is implementable in a real-truck,and the proposed MPC-based PCC algorithm achieves a fuel-saving rate of 7.9%without compromising the truck’s travel time.

Analyze the Performance of Electroactive Anticorrosion Coating of Medical Magnesium Alloy Using Deep Learning

Electroactive anticorrosion coatings are specialized surface treatments that prevent or minimize corrosion. Thestudy employs strategic thermodynamic equilibriumcalculations to pioneer a novel factor in corrosion protection.A first-time proposal, the total acidity (TA) potential of the hydrogen (pH) concept significantly shapes medicalmagnesium alloys. These coatings are meticulously designed for robust corrosion resistance, blending theoreticalinsights and practical applications to enhance our grasp of corrosion prevention mechanisms and establisha systematic approach to coating design. The groundbreaking significance of this study lies in its innovativeintegration of the TA/pH concept,which encompasses the TA/pH ratio of the chemical environment. This approachsurpasses convention by acknowledging the intricate interplay between the acidity and pH levels within thecoating formulation, thereby optimizing metal-phosphate-based conversion coatings and transforming corrosionmitigation strategies. To authenticate the TA/pH concept, the study comprehensively compares its findings withexisting research, rigorously validating the theoretical framework and reinforcing the correlates among TA/pHvalues and observed corrosion resistance in the coatings. The influence of mutations that occur naturally inthe detergent solution on persistent phosphorus changes is shown by empirical confirmation, which improvescorrosion resistance. This realization advances the field ofmaterials and the field’s knowledge of coated generation,particularly anticorrosion converter layers.

Development of Siliconized Epoxy Resins and Their Application as Anticorrosive Coatings

The present work involves the development of siliconized epoxy resin to overcome the drawback of epoxy resin like poor impact strength, high rigidity and moisture absorbing nature because of which they are not applied as corrosion resistant coating. By embedding silicone into the back bone of polymeric resin the above drawback can be reduced to substantial level. For achieving this, siliconised epoxy resins were prepared by reacting amine terminated silicone resin with novolac epoxy resin and meta-phenylenediamine was used as curing agent. The applied films of coating were baked at 150oC. Cured films were evaluated for their thermal, mechanical, chemical and corrosion resistance properties to ascertain the commercial utility of these eco-friendly resin for use in anti corrosive formulations. The siliconized epoxy resins system was found to exhibit good thermal and anticorrosive properties.

Formation of a cerium conversion coating on magnesium alloy using ascorbic acid as additive.Characterisation and anticorrosive properties of the formed films

Cerium-based conversion coatings were formed on AZ91D magnesium alloy by immersion of the substrate in solutions containing Ce(NO_(3))_(3),H_(2)O_(2) and ascorbic acid(HAsc).The characterisation of the films was performed by electrochemical and surface analysis techniques such as SEM,EDS,X-ray diffraction and X-ray photoelectron spectroscopy(XPS).The degree of corrosion protection achieved was evaluated in simulated physiological solution by the open circuit potential monitoring,polarisation techniques and electrochemical impedance spectroscopy(EIS).The presence of HAsc in the conversion solution causes changes in the morphology,adherence and anticorrosive performance of the films.The improvement in the corrosion resistance is closely associated with the corrosion inhibition properties of HAsc.

Effect of Nano Al Pigment on the Anticorrosive Performance of Waterborne Epoxy Coatings

This paper presents the results regarding the effect of nano aluminum powder pigment concentration on the protective properties of waterborne epoxy films in 3.5 wt pct NaCl solution. The anticorrosive performance of the coatings with 0.5, 1, and 3 wt pct pigments and none pigment were investigated using electrochemical impedance spectroscopy （EIS）, scanning electron microscopy （SEM） and Raman spectroscopy techniques. The results show that adding appropriate amount of nano-aluminium powder pigment can enhance the barrier properties of the epoxy coating, which is attributed to the surface effect of nanoparticles and the compatibility of the pigment with the waterborne epoxy coatings.

Development of Hexachloroiridic Acid Anticorrosive Coating

A technology of preparing hexachloroiridic acid by melting oxidation chemistry is introduced, the content of Ir 4+ can reach 99% and the total impurities content is less than 0.1% in this hexachloroiridic acid anticorosive coating.

Application and Development of Anticorrosive Wood in Environmental Art

In view of development of anticorrosive wood and its application in environmental art,problems in anticorrosive wood application and countermeasures were explored to improve the application of anticorrosive wood,increase the application amount and range.

The anti-Temperature-vibration properties of viscoelastic anticorrosive tape

Viscoelastic anticorrosive tape is extensively used for repairing anticorrosive layers on compressor outlet pipelines in the oil and gas industry.However,there is no relevant research on the coupling effect of temperature and vibration on the performance of viscoelastic anticorrosive tape.In this paper,acceleration tests of temperature and vibration coupling conditions were conducted to investigate the performance of viscoelastic anticorrosive tape.After temperature and vibration treatment,the specimens showed wide variance in thickness,and the adhesion and chemical soaking resistance of the tape was reduced.However,the viscoelastic anticorrosive tape still showed high adhesion.According to theoretical calculations,the tested viscoelastic body can repair pipes with a maximum diameter of 903 mm.Therefore,this viscoelastic anticorrosive tape is suitable for the compressor outlets of buried pipelines with diameters smaller than 903 mm.The research in this paper provides a method and basis for the selection of repairing materials for the anticorrosion coatings of compressor outlet pipelines.

The Selection and Application of Anticorrosive Materials for Flue Gas Desulfurization (FGD) System in Cement Plant

This paper combined with the actual case of flue gas desulfurization (FGD) system in cement Plant, analyzes the corrosion environment in each area of the FGD system, and selects appropriate anticorrosive materials for different corrosion environment, so as to provide operating experience and reference for the safe, stable and efficient operation of the FGD system.

Anticorrosive Coatings Based on Few-Layer Graphene

In this paper the anticorrosive properties of the few-layer graphene nanostructures were investigated. On the surface ofcopper and nickel plates the few-layer graphene nanostructures were formed using the CVD （chemical vapor deposition） method.After that, these plates were exposed to the temperature in the air atmosphere. The results of elemental analysis, performed by theEDS （energy dispersive spectroscopy） method showed that the few-layer graphene coated metal plates proved to be more resistant tooxidation than bare metal plates. In addition, we presented computer models and theoretical calculations of the studied systems,performed by the DFT （density functional theory） and MD （molecular dynamics） methods. These results combined with experimentaldata show the high effectiveness of the protective action of the few-layer graphene against metal corrosion.

Optimization of Engine Control Strategies for Low Fuel Consumption in Heavy-Duty Commercial Vehicles

The reduction of fuel consumption in engines is always considered of vital importance.Along these lines,in this work,this goal was attained by optimizing the heavy-duty commercial vehicle engine control strategy.More specifically,at first,a general first principles model for heavy-duty commercial vehicles and a transient fuel consumptionmodel for heavy-duty commercial vehicles were developed and the parameters were adjusted to fit the empirical data.The accuracy of the proposed modelwas demonstrated fromthe stage and the final results.Next,the control optimization problem resulting in low fuel consumption in heavy commercial vehicles was described,with minimal fuel usage as the optimization goal and throttle opening as the control variable.Then,a time-continuous engine management approach was assessed.Next,the factors that influence low fuel consumption in heavy-duty commercial vehicles were systematically examined.To reduce the computing complexity,the control strategies related to the time constraints of the engine were parametrized using three different methods.The most effective solution was obtained by applying a global optimization strategy because the constrained optimization problem was nonlinear.Finally,the effectiveness of the low-fuel consumption engine control strategy was demonstrated by comparing the simulated and field test results.

Developing single-atom catalyst-based epoxy coating with active nanocatalytic anticorrosion performance in oxygen environment

The stimuli-responsive anticorrosion coatings have drawn great attention as a prospective corrosion protection approach due to their smart self-repairing properties.In contrast to passive protection mechanism based on post-corrosion microenvironmental changes,a unique active protection strategy based on nanocatalytic oxygen depletion is proposed in this work to inhibit the occurrence of corrosion.Porous FeeNeC catalysts with outstanding oxygen reduction reaction(ORR)activity(half-wave potential of 0.89 V)is firstly synthesized through pre-coordination with organosilane precursor to obtain homogeneously distributed active sites.When this catalyst is introduced into the coating matrix,uniformly distributed FeeNeC not only compensates the defects but plays a crucial role in adsorption and consumption of diffused oxygen in the coating.Under this dual action,the penetration of corrosive medium,especially oxygen,through coating to metal substrate is greatly suppressed,resulting in effective corrosion inhibition and a significant increase in corrosion resistance of the composite coating compared to pure epoxy coating.This work provides a new perspective and the starting point for the design of high-performance smart coating with active anticorrosion properties.

有压热闷渣微粉对环氧涂料的性能影响

以有压热闷渣为研究对象,采用超细立式粉磨机处理有压热闷渣形成微粉,利用有压热闷渣微粉替代传统防腐填料与环氧树脂、二甲苯、正丁醇及聚酰胺形成有压热闷渣/环氧复合防腐涂料.根据《色漆和清漆摆杆阻尼试验》(GB/T 1730—2007)、《漆膜划圈试验》(GB/T 1720—2020)、《色漆和清漆耐磨性的测定旋转橡胶砂轮法》(GB/T 1768—2006)、《漆膜、腻子膜柔韧性测定法》(GB/T 1731—2020)测定涂层的硬度、附着力、耐磨性、柔韧性,《色漆和清漆耐中性盐雾性能》(GB/T 1771—2007)与《漆膜吸水率测定法》(HG/T 3344—2012)测定涂层的耐盐雾性能及吸水率.采用接触角测量仪、精密阻抗测试仪和电化学工作站测定涂层的接触角、阻抗模量和腐蚀电位.采用扫描电子显微镜、X射线荧光光谱仪、X射线衍射仪和激光粒度分析仪测试微观形貌、化学成分、矿物组成和粒度分布.研究有压热闷渣微粉对环氧复合防腐涂料涂层力学性能、防腐性能的影响,及其作用机理.结果表明有压热闷渣的主要矿物成分C_(3)S、C_(2)S、Ca(OH)_(2)、C_(2)F、RO相和f-CaO等,其具有硅酸盐特性可以提高耐久性.利用超细立式粉磨机对有压热闷渣进行加工,有利于f-CaO矿化,减小颗粒粒径、增大比表面积.当有压热闷渣微粉的粒径均匀度为2.240,其添加量为5%时有压热闷渣/环氧复合防腐涂料涂层的性能最佳,即摆杆硬度测试结果为115.75 s、附着力为3级、磨损量最小、柔韧性为4 mm、阻抗模量为10^(6.1)Ω·cm^(2)、腐蚀电位E为0.143 V.有压热闷渣微粉作为一种刚性粒子,将其加入环氧涂料体系中,一方面可以改善涂层的硬度、耐摩擦、力学等性能,另一方面合理的粒径均匀度可以增强涂层的密实度,提升防腐性能.开启有压热闷渣在非建材领域高值化利用的新途径,实现钢铁行业“以废增效”、涂料行业“以废降本”的目的.

纳米复合智能防腐涂层在金属表面上的应用研究

智能防腐涂料能可有效地提高金属的使用寿命,因而具有自愈功能的智能防腐涂料越来越受到人们的重视。概述了pH响应、光刺激响应、离子响应等不同触发机制的纳米智能防腐机制研究,总结了不同金属表面纳米复合智能防腐涂层研究进展,最后提出金属表面智能自修复防腐涂层发展所面临的挑战和未来发展前景。

软模板法制备聚苯胺干凝胶及在水性防腐涂料中的应用

分别以双十八烷基二甲基氯化铵和双十二烷基二甲基氯化铵为软模板,采用化学氧化法制备聚苯胺干凝胶。通过傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)等对聚苯胺干凝胶进行结构表征;将制备的聚苯胺干凝胶应用于水性防腐涂料中,考察其对水性涂料防腐性能的影响。结果表明,制得的聚苯胺水性防腐涂料具有较好的耐水、耐酸、耐碱、耐中性盐雾性。

新型石墨烯复合材料在金属防腐蚀领域的研究进展

介绍了石墨烯复合材料的防腐蚀原理,总结了国内外石墨烯和氧化石墨烯防护膜在金属防腐蚀领域的研究现状及存在的问题。简要介绍了改性石墨烯复合涂层的制备工艺及其效果。从无机纳米氧化物/石墨烯复合材料、聚苯胺/石墨烯复合材料、聚氨酯/石墨烯复合材料和硅烷/石墨烯复合材料等四方面综述了改性石墨烯复合材料在金属防护中的应用,指出目前我国石墨烯复合材料存在的主要问题,并对石墨烯复合材料在金属防腐蚀领域的研究方向进行了展望。

稠油井内衬保温油管热损失分析及开采参数优化

针对塔河油田稠油开采过程中原油热量损失大、资源浪费的问题,开展内衬保温油管开采技术研究。基于井筒稳态热传递与地层非稳态热传递理论,建立了稠油井井筒热传递数学模型,评价了不同内衬材料油管的保温性能,揭示了含水率、日产液量及内衬保温油管下深对井筒温度的影响规律。研究表明:内衬聚酮防腐层与气凝胶保温层的保温油管保温性能最佳,日产液量和保温油管下深对井口温度影响较大,含水率对井口温度的影响较小;日产液量大于72 t/d且保温油管下深大于3 500 m时,可满足稠油开采的温度要求。该研究明确了内衬保温油管保温的可行性,可为油田保温油管内衬的选材、稠油开采工艺参数的制订提供技术依据。