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Predict the evolution of mechanical property of Al-Li alloys in a marine environment

Defence Technology（防务技术） 2024年第1期31卷 557-566页

作者： Wei Li Lin Xiang Guang Wu Hongli Si Jinyan Chen Yiming Jin Yan Su Jianquan Tao Chunyang Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100036China Chongqing Innovation Center Beijing Institute of TechnologyChongqing400044China First Research Institute of the Ministry of Public Security for PR China Beijing100036China Southwest Technology and Engineering Research Institute Chongqing400039China

The ocean is one of the essential fields of national defense in the future,and more and more attention is paid to the lightweight research of marine equipment and materials.This study it is to develop a Machine learning(ML)-based prediction method to study the evolution of the mechanical properties of Al-Li alloys in the marine environment.We obtained the mechanical properties of Al-Li alloy samples under uniaxial tensile deformation at different exposure times through marine exposure experiments.We obtained the strain evolution by digital image correlation(DIC).The strain field images are voxelized using 2D-Convolutional Neural Networks(CNN)autoencoders as input data for Long Short-Term Memory(LSTM)neural networks.Then,the output data of LSTM neural networks combined with corrosion features were input into the Back Propagation(BP)neural network to predict the mechanical properties of Al-Li alloys.The main conclusions are as follows:1.The variation law of mechanical properties of2297-T8 in the marine atmosphere is revealed.With the increase in outdoor exposure test time,the tensile elastic model of 2297-T8 changes slowly,within 10%,and the tensile yield stress changes significantly,with a maximum attenuation of 23.6%.2.The prediction model can predict the strain evolution and mechanical response simultaneously with an error of less than 5%.3.This study shows that a CNN/LSTM system based on machine learning can be built to capture the corrosion characteristics of marine exposure experiments.The results show that the relationship between corrosion characteristics and mechanical response can be predicted without considering the microstructure evolution of metal materials.

关键词： marine environment Al-Li alloy Machine learning Corrosion

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Corrosion behavior of HVOF Inconel 625 coating in the simulated marine environment

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China Welding 2024年第1期33卷 46-51页

作者：彭超钟丰平袁梦谢世杰王学斌 National Quality Inspection and Testing Center of Special Metal Structural Materials Zhejiang Academy of Special Equipment ScienceHangzhou 310020China Key Laboratory of Special Equipment Safety Testing Technology of Zhejiang Province Hangzhou 310020China Zhejiang-Ukraine Joint Laboratory for Materials and Welding Testing Technology Hangzhou 310020China

High velocity oxygen fuel(HVOF)spraying process is commonly used to produce superalloy coatings.Inconel 625 coating was prepared on Q235B low carbon steel by HVOF.A series of experiments were conducted to examine the surface and corrosion resistance properties of Inconel 625 HVOF coating.In this paper,potentiodynamic polarization tests and electrochemical impedance spectroscopy(EIS)tests were carried out to evaluate the corrosion resistance of Inconel 625 coating under simulated marine environment.The experiment-al results showed that Inconel 625 coating revealed low porosity and desired coating thickness.Shift in the corrosion potential(E_(corr))to-wards the noble direction combined with much low corrosion current density(i_(corr))indicating a significant improvement of HVOF Inconel 625 coating compared with the substrate.

关键词： high velocity oxygen fuel(HVOF) Inconel 625 coating marine environment corrosion

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Bio-inhibitive effect of an algal symbiotic bacterium on corrosion of magnesium in marine environment

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Journal of Magnesium and Alloys 2023年第12期11卷 4603-4618页

作者： Yuqiao Dong Guang-Ling Song Yuqing Xu Dajiang Zheng College of Materials Xiamen UniversityXiamen 361005China Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhenChina State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University422 S.Siming RdXiamen361005China The University of Queensland School of Mechanical and Mining EngineeringDivision of Materials EngineeringSt LuciaQld 4072 Australia Institute of Corrosion Science and Technology Guangzhou510530GuangdongChina

It is a longstanding and challenging task to develop sustainable environment-friendly and cost-effective corrosion-protection technologies for Mg alloys, especially under marine conditions in which corrosion can normally be significantly accelerated by bacterial activity. However,this paper reports on the corrosion of highly active Mg interestingly inhibited by an algal-symbiotic bacterium Bacillus altitudinis. The corrosion of Mg in the presence of the bacterium drastically reduced by one order of magnitude after 14 days of immersion. This means that the algal-symbiotic bacterium widely available in natural ocean environments may be employed as a green and sustainable inhibitor in the marine industry. Based on electrochemical measurements, surface analyses and microbe experiments, a combined inhibition mechanism is proposed in the paper to interpret the interesting corrosion behavior of Mg.

关键词： Magnesium Corrosion inhibition marine environment Biofilm Bacterium

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Effect of Retained Austenite on Corrosion Behavior of Ultrafine Bainitic Steel in marine environment

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Acta Metallurgica Sinica(English Letters) 2023年第5期36卷 717-731页

作者： Xian Zhang Li Gong Yanpeng Feng Zhihui Wang Miao Yang Lin Cheng Jing Liu Kaiming Wu Hubei Province Key Laboratory of Systems Science in Metallurgical Process The State Key Laboratory of Refractories and MetallurgyCollaborative Innovation Center for Advanced SteelsWuhan University of Science and TechnologyWuhan430081China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China

In this study,the impact of retained austenite on corrosion initiation,propagation,and resistance of ultrafine bainitic steels in marine environments based on the one-step and two-step bainitic isothermal transformation was investigated using a combination of theoretical calculations and experimental methods.According to the results,the microstructure of ultrafine bainitic steels was composed of parallel arranged bainite ferrite(BF)and retained austenite(RA).The fraction of the block RA was significantly reduced,whereas the amount of the film RA increased through the two-step bainitic transformation.In the initial stage of corrosion,micro-galvanic effects occurred between the multiphases due to the difference in nobility,leading to the selective dissolution of BF sheaves,which is adjacent to the block RA in the one-step bainitic steel.However,uniformly distributed film RA in the two-step bainitic steel acted as a barrier against corrosion propagation.The electrochemical measurements and neutral salt spray tests revealed a relatively lower corrosion rate for the two-step bainitic steel,indicating a higher corrosion resistance than the one-step bainitic steel.The corrosion products layer mainly consisted ofα-FeOOH,γ-FeOOH,and Fe_(3)O_(4),which were stable and favorable for the formation of a protective rust layer.

关键词： Ultrafine bainitic steel Retained austenite marine environment Corrosion behavior First principle modeling

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Sensitivity analysis of the deterioration of concrete strength in marine environment to multiple corrosive ions

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Frontiers of Structural and Civil Engineering 2022年第2期16卷 175-190页

作者： Jinwei YAO Jiankang CHEN Zhejiang Business Technology Institute Ningbo315012China Key Laboratory of Impact and Safety Engineering Ministry of EducationSchool of Mechanical Engineering and MechanicsNingbo UniversityNingbo315211China

The corrosion degradation behavior of concrete materials plays a crucial role in the change of its mechanical properties under multi-ion interaction in the marine environment.In this study,the variation in the macrophysical and mechanical properties of concrete with corrosion time is investigated,and the source of micro-corrosion products under different salt solutions in seawater are analyzed.Regardless of the continuous hydration effect of concrete,the damage effects of various corrosive ions(Cl^(−),SO_(4)^(2−),and Mg^(2+),etc.)on the tensile and compressive strength of concrete are discussed based on measurement in different salt solutions.The sensitivity analysis method for concrete strength is used to quantitatively analyze the sensitivity of concrete strength to the effects of each ion in a multi-salt solution without considering the influence of continued hydration.The quantitative results indicate that the addition of Cl−can weaken the corrosion effect of SO_(4)^(2−) by about 20%,while the addition of Mg^(2+)or Mg^(2+)and Cl^(−)can strengthen it by 10%–20%during a 600-d corrosion process.

关键词： sensitivity analysis concrete strength corrosion deterioration multi-ion interaction marine environment

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Degradation and Mechanism of the Mechanics and Durability of Reinforced Concrete Slab in A marine environment

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China Ocean Engineering 2016年第2期30卷 257-270页

作者：吴胜兴刘冠国卞汉兵吕维波蒋建华 College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China Jiangsu Engineering Research Center for Cracking Control of Building Hohai UniversityNanjing 210098China Jiangsu Transportation Research Institute Co.Ltd. Nanjing 211112China Laboratoire LEM3(UMR CNRS 7239) Universite de LorraineIle du Saulcy57045 Metz Cedex 01France Nanjing City-Town Architecture Design&Consultants Co.Ltd. Nanjing 210009China

An experimental research was conducted to determine the corrosion and bearing capacity of a reinforced concrete（RC） slab at different ages in a marine environment.Results show that the development of corrosion-induced cracks on a slab in a marine environment can be divided into three stages according to crack morphology at the bottom of the slab.In the first stage,cracks appear.In the second stage,cracks develop from the edges to the middle of the slab.In the third stage,longitudinal and transverse corrosion-induced cracks coexist.The corrosion ratio of reinforcements nonlinearly increases with the age,and the relationship between the corrosion ratio of the reinforcements and the corrosion-induced crack width of the concrete is established.The flexural capacity of the corroded RC slab nonlinearly decreases with the age,and the model for the bearing capacity factor of the corroded RC slab is established.The mid-span deflection of the corroded RC slab that corresponds to the yield of the reinforcements linearly increases with the increase in corrosion ratio.Finally,the mechanisms of corrosion morphology and the degradation of the mechanical properties of an RC slab in a marine environment are discussed on the basis of the basic theories of steel corrosion in concrete and concrete structure design.

关键词： marine environment RC slab corrosion bearing capacity deflection

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Atmospheric corrosion behavior of low-alloy steels in a tropical marine environment

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Journal of Iron and Steel Research(International) 2019年第12期26卷 1315-1328页

作者： Zhao-liang Li Kui Xiao Chao-fang Dong Xue-qun Cheng Wei Xue Wei Yu Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Engineering Research Institute University of Science and Technology BeijingBeijing 100083China

The corrosion behavior of carbon steels and weathering steels was investigated in a tropical marine environment.And both exhibited similar corrosion weight-loss behavior in tropical marine environments.Corrosion weight loss(W)as a function of exposure time(t)can be calculated using the power function,W=A^tn.The values of the initial corrosion rate,A,and corrosion tendency,n,can be easily obtained by taking the logarithm of the power equation.However,the corrosion rust-layer structure of the two materials was quite different.The rust layer of carbon steel presents a single-layer structure.Meanwhile,the rust layer of weathering steel exhibits a single-layer structure after exposure for about 24 months and then gradually evolves into a double-layer structure.The main corrosion products of the steels areβ-FeOOH,γ-FeOOH,and Fe3O4 in the initial stage of exposure.In the rust layers,α-FeOOH appeared after 12 months of exposure.

关键词： marine environment Atmospheric corrosion Carbon steel Weathering steel Rust

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Initiation and propagation of localized corrosion induced by(Zr,Ti,Al)-O_(x) inclusions in low-alloy steels in marine environment

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Journal of Iron and Steel Research(International) 2021年第4期28卷 453-463页

作者： Wen-zhui Wei Kai-ming Wu Jing Liu Lin Cheng Xian Zhang The State Key Laboratory of Refractories and Metallurgy Hubei Province Key Laboratory of Systems Science in Metallurgical ProcessCollaborative Innovation Center for Advanced SteelsWuhan University of Science and TechnologyWuhan 430081HubeiChina

The effects of inclusions on localized corrosion of Zr–Ti deoxidized low-alloy steels in marine environment were investigated by various analytical techniques including scanning electron microscopy with X-ray microanalysis(SEM/EDS),confocal Raman microscopy(CRM),and in situ scanning vibrating electrode technique(SVET).It was found that complex(Zr,Ti,Al)-O_(x)inclusions were responsible for the initiation of localized corrosion.Localized corrosion pref-erentially occurred at Fe matrix adjacent to these inclusions and formed micro-gaps.In the early stage of corrosion,catalytic-occluded cells and the diffusion of chloride ions played a major role in the propagation of corrosion,further accelerating the dissolution of Fe matrix and(Zr,Ti,Al)-O_(x)inclusions.Combining SVET and CRM results,it revealed that the maximum anodic current density in local area gradually decreased with prolonged exposure time,indicating that corrosion products covered the steel surface and lowered the propagation rate of corrosion.In the later stage of corrosion,the barrier effect of corrosion products played an important role in inhibiting localized corrosion.

关键词： (Zr,Ti,Al)-O_(x)inclusion Localized corrosion Low-alloy steel marine environment Scanning vibrating electrode technique

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Modeling Boundary and Edge Effect of Chloride Diffusion for Durability Design of Concrete Structures Exposed in marine environment

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Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1112-1117页

作者： ZHOU Xingang LI Kefei CHEN Zhaoyuan Department of Civil Engineering Tsinghua University School of Civil Engineering Yantai University

According to the Fick＇s second law of diffusion, six analytical solutions of chloride profile in concrete were studied and discussed with regard to different boundary and initial conditions. In those analytical solutions, the most prevailing error-function solution which is based on semi-infinite assumption is the simple one, but may under-estimate the chloride content in concrete and over-rate the life time prediction of concrete structures. The experimental results show that compared with other solutions, the chloride content in concrete predicted by error-function model is the minimum, and the calculation difference produced by different analytical models should not be ignored. The influence of models on chloride content prediction is more than other environment and material coefficients in some time. In order to get a more realistic prediction model, modification to error-function model is suggested based on analysis and calculation examples concerning the boundary and edge effect.

关键词： durability of concrete marine environment durability design and life prediction error-function model model modification

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Microplastics in marine environment: Occurrence, Distribution, and Extraction Methods in marine Organisms

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Open Journal of Ecology 2023年第12期13卷 931-955页

作者： Boluwatife S. Olubusoye Peter Oni Faustina Owusu Oluwatoyin Adekoya Acaye Ongwech Daniel A. Odogwu Oluwafemi Awolesi Ayobami Oje Beatrice Arwenyo Department of Chemistry and Biochemistry University of Mississippi Oxford USA Department of Chemistry and Biochemistry Worcester Polytechnic Institute Worcester USA Department of environmental Science Louisiana State University Baton Rouge USA Department of Water Resource Policy Grand Valley State University Grand Rapids USA Department of Chemistry Gulu University Gulu Uganda Department of Chemistry and Biochemistry Brigham Young University Provo USA Research and Development Unit Ecoxygiene Services Limited Lagos Nigeria Department of Agricultural Engineering Federal University of Technology Akure Akure Nigeria

The pervasive presence of microplastics in marine environments has raised significant concerns. This review addresses the pressing issue of microplastic pollution in marine ecosystems and its potential implications for both the environment and human health. It outlines the current state of microplastic occurrence, distribution, and extraction methods within marine organisms. Microplastics have emerged as a significant environmental concern due to their harmful effects on ecosystems and their potential human health risks. These particles infiltrate marine environments through runoff and atmospheric deposition, ultimately contaminating beaches and posing threats to marine life. Despite the gravity of this issue, there has been limited research on the presence and distribution of microplastics in marine organisms. This review aims to bridge this knowledge gap by comprehensively examining the occurrence, distribution, and various extraction methods used to detect microplastics in marine organisms. It emphasizes the urgent need for targeted measures to manage microplastic pollution, highlights the significant role of human activities in contributing to this problem, and underscores the importance of reducing human-induced pollution to safeguard marine ecosystems. While this paper contributes to the understanding of microplastic pollution in marine environments and underscores the critical importance of taking action to protect marine organisms and preserve our oceans for future generations, it also emphasizes that, in effectively tackling the microplastic problem, a well-coordinated approach is essential, involving research initiatives, policy adjustments, public involvement, and innovative technologies. Crucially, prompt and resolute responses must exist to counteract the escalating peril posed by microplastics to the oceans and the global environment.

关键词： Microplastics marine environment marine Organisms Extraction Methods Ecological Impact Ocean Pollution

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