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atmospheric corrosion of Q235 Carbon Steel and Q450 Weathering Steel in Turpan,China

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Journal of Iron and Steel Research International 2016年第10期23卷 1061-1070页

作者： Qiang YU Chao-fang DONG Yue-hua FANG Kui XIAO Chun-yun GUO Gang HE Xiao-gang LI corrosion and Protection Center Key Laboratory for Corrosion and Protection University of Science and Technology Beijing Beijing 100083 China Xinjiang Turpan Natural Environmental Test Research Center Turpan 838200 Xinjiang China

Q235carbon steel and Q450 weathering steel were exposed to the hot and dry environment of Turpan,China for three *** corrosion rates of both steels were calculated and *** morphologies of the rust layer products were observed by optical microscopy and scanning electron *** of the rust layers were performed by X-ray photoelectron spectroscopy,X-ray powder diffraction,and Raman spectroscopy,and analysis results indicate that the compositions of rust are main iron rich oxide such as FeOOH,Fe_3O_4,and Fe_2O_*** iron oxide layer content proportion was calculated through a semi-quantitative *** resistance elements（Cr,Ni,and Cu）enhanced the resistance properties of the Q450 weathering steel ***,the resistance elements increased the proportion of goethite crystals in the corroded rust layer.

关键词： atmospheric corrosion Q235 carbon steel Q450 weathering steel rust layer

atmospheric corrosion behavior of Nb-and Sb-added weathering steels exposed to the South China Sea

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International Journal of Minerals,Metallurgy and Materials 2022年第11期29卷 2041-2052页

作者： Wei Wu Lili Zhu Peilin Chai Niyun Liu Longfei Song Zhiyong Liu Xiaogang Li Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Institute of Historical Metallurgy and Materials University of Science and Technology BeijingBeijing 100083China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China

The atmospheric corrosion behavior of new-type weathering steels(WSs)was comparatively studied,and the effects of Nb and Sb during corrosion were clarified in detail through field exposure and *** results showed that the addition of Nb and Sb played positive roles in corrosion resistance,but there was a clear difference between these two *** addition slightly improved the rust property of conventional WS but could not inhibit the electrochemical *** contrast,Sb addition significantly improved the corrosion resistance from the aspects of electrochemistry and rust *** with only 0.06wt%Nb,the combination of 0.05wt%Sb and 0.06wt%Nb could better optimize the rust structure,accelerate the formation of a high proportion of dense and protectiveα-FeOOH,repel the invasion of Cl^(−),and retard the localized acidification at the bottom of the pit.

关键词： low alloy steel Sb addition atmospheric corrosion corrosion products marine local acidification

atmospheric corrosion of Steel A3 Deposited with Ammonium Sulfate and in the Presence of Sulfur Dioxide

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Journal of Materials Science & Technology 2003年第5期19卷 453-455页

作者： YeWAN ChuanweiYAN ChunanCAO JunTAN StateKeyLaboratoryforcorrosionandProtection InstituteofMetalResearchChineseAcademyofSciencesShenyang110016China ShenyangNationalLaboratoryforMaterialsScience InstituteofMetalResearchChineseAcademyofSciencesShenyang110016China

A laboratory study of the atmospheric corrosion of carbon steel deposited with (NH4)2SO4 in the presence of SO2 is reported. The different levels of (NH4)2SO4 (0, 15, 30, 45, 60 μg·cm-2) were added on the surface of the samples before the exposure. The corrosion was investigated by a combination of gravimetry, Fourier transform infrared spectroscope and scanning electron microscopy. A detailed knowledge about the corrosion products was acquired, both quantitatively and qualitatively. The results show that the metal loss increased and the increasing tendency of corrosion rates slowed down with the increasing exposure time. The phase constituents of the corrosion products are mainly α-FeO(OH), γ-FeO(OH), and δ-FeO(OH).

关键词： Steel A3 atmospheric corrosion Deposition Ammonium sulfate Sulfur dioxide

atmospheric corrosion Monitoring of Field-exposed Q235B and T91 Steels in Zhoushan Offshore Environment Using Electrochemical Probes

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Journal of Wuhan University of Technology(Materials Science) 2017年第6期32卷 1433-1440页

作者：夏大海 SONG Shizhe JIN Weixian LI Jian 高志明 WANG Jihui HU Wenbin School of Materials Science and Engineering Tianjin University Tianjin 300354 China CAS Key Laboratory of Nuclear Materialsand Safety Assessment Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Zhoushan Marine corrosionInstitute of Central Research Institute of Iron and Steel Zhoushan 316000 China State Key Laboratory of Precision Measurement Technology and lnstrument Tianjin University Tianjin 300072 China

This work aimed to in-situ monitor the atmospheric corrosion of steels exposed to Zhoushan offshore environment by using electrochemical noise（EN） technique. A portable EN monitoring system was established and two electrochemical probes（named as Q235 B and T91） were designed. Experimental results indicated that the noise resistance of T91 steel was higher than that of Q235 B steel, revealing that the corrosion resistance of T91 was higher than that of Q235 B. A 60-day monitoring result indicated that the noise resistance was well correlated with the weight loss data. Wavelet analyses results of EN data indicated that Q235 B underwent uniform corrosion and T91 suffered from localized corrosion, which was further confirmed by the surface observation. It is concluded that EN can be used as a new method to identify the corrosion form and corrosion resistance in atmospheric conditions.

关键词： atmospheric corrosion electrochemical noise corrosion monitoring offshore in field

Role of CO_2 in the initial stage of atmospheric corrosion of AZ91 magne-sium alloy in the presence of NaCl

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Rare Metals 2006年第2期25卷 190-196页

作者： LIN Cui LI Xiaogang Department of Material Science and Technology Nanchang Institute of Aeronautical Technology Nanchang 330034 China corrosion and Protection Center University of Science and Technology Beijing Beijing 100083 China State Key Laboratory for corrosion and Protection Institute of Metal Research The Chinese Academy of Sciences Shenyang 110016 China

The effect of CO2 and NaCl on the initial stage of atmospheric corrosion of AZ91 magnesium alloy was studied. The observation of surface morphology by optical microscopy （OM）, scanning electron microscopy （SEM） and the analysis of corrosion products by X-ray diffraction （XRD） were integrated to investigate corrosion evolution. The results showed that NaCl stimulated the corrosion by promoting the formation of thin electrolyte film, increasing the conductivity and breaking the protective film in the absence of CO2. The morphology of the corroded samples with deposited NaCl was more homogenous in the presence of CO2. It was suggested that NaCl-induced corrosion was inhibited in the presence of CO2 by the formation of slightly soluble corrosion products containing hydroxy carbonates and hydroxy chlorides that provided a partly protective layer on the surface of the magnesium alloy.

关键词： materials science atmospheric corrosion initial stage AZ91 magnesium alloy inhibition

atmospheric corrosion of carbon steel in acid rain by accelerated weathering test

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Journal of Environmental Sciences 1991年第2期3卷 37-43页

作者： Zhang Fengqiu, Zhen Yiping and Wang ZhenyaoInstitute of corrosion and Protection of Metals,Academia Sinica,Shenyang 110015,China

In this work, the accelerated weathering test of immersion-wet-dry combined cycles was carried ont. The artificial acid rain of NaHSO3-(NH4)2SO4-H2SO4 solution system was selected as immersion solution. Acidity of artificial acid rain affected corrossion weight loss of carbon steel, and pH 4.1 was found to be a critical point. Anodic reaction resistance of the samples during accelerated weathering test increased with exposed time by electrochemical measurement.

关键词： acid rain atmospheric corrosion carbon steel weathering test.

Understanding environmental impacts on initial atmospheric corrosion based on corrosion monitoring sensors

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Journal of Materials Science & Technology 2021年第5期64卷 214-221页

作者： Zibo Pei Xuequn Cheng Xiaojia Yang Qing Li Chenhan Xia Dawei Zhang Xiaogang Li Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Corrosion and Protection(MOE)Institute for AdvancedMaterials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China School of Material Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

atmospheric corrosion monitoring(ACM)sensors were employed to study the initial atmospheric corrosion of carbon steels over a one-month period in six outdoor dynamic atmospheric environments in *** on the~250,000 corrosion data sets collected,the environmental impacts of relative humidity,temperature and rainfall on the initial corrosion behavior of carbon steels were *** results showed that rainfall was the strongest environmental factor influencing the initial atmospheric corrosion *** humidity significantly influenced the corrosion of carbon steels in low-precipitation environments and non-rainfall period.

关键词： atmospheric corrosion corrosion monitoring Sensors Carbon steels

Numerical Approach for atmospheric corrosion Monitoring Based on EIS of a Weathering Steel

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Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 261-271页

作者： Ch.Thee Long Hao Jun-Hua Dong Xin Mu Wei Ke State Key Laboratory for corrosion and Protection Institute of Metal Research Chinese Academy of Sciences

Electrochemical impedance spectroscopy （EIS） and film thickness measurement have been employed to study the atmospheric corrosion of a weathering steel covered with a thin electrolyte layer in a simulated coastal-industrial atmosphere. The results indicate that the corrosion rate is a function of the covered electrolyte thickness and the wet/dry cycle. Within each wet/dry cycle, the increased corrosion rate is related to the increased Cl^- and SO4^2- concentration and an enhancement of oxygen diffusion rate with the evaporation of the electrolyte. In addition, the corrosion rate increases during the initial corrosion stage and then decreases as the wet/dry cycle proceeds. Moreover, one mathematical approach based on the numerical integration method to obtain corrosion mass loss of steel from the measurements of EIS has been developed, and this would be useful for the development of indoor simulated atmospheric corrosion tests.

关键词： Weathering steel atmospheric corrosion Electrochemical impedance spectroscopy Steel rust Coastal-industrial atmosphere

Review on modelling of corrosion under droplet electrolyte for predicting atmospheric corrosion rate

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Journal of Materials Science & Technology 2021年第3期62卷 254-267页

作者： Bangalore Gangadharacharya Koushik Nils Van den Steen Mesﬁn Haile Mamme Yves Van Ingelgem Herman Terryn Vrije Universiteit Brussel Research Group Electrochemical and Surface Engineering(SURF)Pleinlaan 21050 BrusselsBelgium Vrije Universiteit Brussel Eenheid Algemene Chemie(ALGC)Pleinlaan 21050 BrusselsBelgium

atmospheric corrosion of metals is the most common type of corrosion which has a significant impact on the environment and operational safety in various situations of everyday *** of the common examples can be observed in land,water and air transportation systems,electronic circuit boards,urban and offshore *** dew drops formed on metal surface due to condensation of atmospheric moisture facilitates corrosion as an *** corrosion mechanisms under these droplets are different from classically known bulk electrolyte *** to thin and non-uniform geometric thickness of the droplet electrolyte,the atmospheric oxygen requires a shorter diffusion path to reach the metal *** corrosion under a droplet is driven by the depletion of oxygen in the center of the droplet compared to the edge,known as differential *** case of a larger droplet,differential aeration leads to preferential cathodic activity at the edge and is controlled by the droplet ***,for a smaller droplet,the oxygen concentration remains uniform and hence cathodic activity is not controlled by droplet *** geometry of condensed droplets varies dynamically with changing environmental parameters,influencing corrosion mechanisms as the droplets evolve in *** this review,various modelling approaches used to simulate the corrosion under droplet electrolytes are *** the efforts of developing a comprehensive model to estimate corrosion rates,it has been noted from this review that the influence of geometric evolution of the droplet due to condensation/evaporation processes on corrosion mechanisms are yet to be *** varying external factors like environmental temperature,relative humidity,presence of hygroscopic salts and pollutants influence the evolution of droplet electrolyte,making it a complex phenomenon to ***,an overview of available dropwise condensation and evaporation models which descri

关键词： atmospheric corrosion Water droplets Mathematical modelling Condensation Evaporation