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

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

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Towards Cr（VI）-free anodization of aluminum alloys for aerospace adhesive bonding applications： A review

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Frontiers of Chemical Science and Engineering 2017年第3期11卷 465-482页

作者： Shoshan T. Abrahami John M.M. de Kok herman terryn Johannes M.C. Mol Materials innovation institute (M2i) 2628 XG Delft The Netherlands Delft University of Technology Department of Materials Science and Engineering 2628 CD Delft The Netherlands Fokker Aerostructures BV 3351 LB Papendrecht The Netherlands Department of Materials and Chemistry Research Group Electrochemical and Surface Engineering (SURF) Vrije Universiteit Brussel 1050 Brussels Belgium

For more than six decades, chromic acid anodizing （CAA） has been the central process in the surface pre-treatment of aluminum for adhesively bonded aircraft structures. Unfortunately, this electrolyte contains hexavalent chromium （Cr（VI））, a compound known for its toxicity and carcinogenic properties. To comply with the new strict international regulations, the Cr（VI）-era will soon have to come to an end. Anodizing aluminum in acid electrolytes produces a self-ordered porous oxide layer. Although different acids can be used to create this type of structure, the excellent adhesion and corrosion resistance that is currently achieved by the complete Cr（VI）-based process is not easily matched. This paper provides a critical overview and appraisal of proposed alternatives to CAA, including combinations of multiple anodizing steps, pre- and post anodizing treatments. The work is presented in terms of the modifications to the oxide properties, such as morphological features （e.g., pore size, barrier layer thickness） and surface chemistry, in order to evaluate the link between fundamental principles of adhesion and bond performance.

关键词： aluminum Cr(VI)-free surface pre-treat- merits anodizing adhesive bonding

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New insights into the mechanism of localised corrosion induced by TiN-containing inclusions in high strength low alloy steel

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Journal of Materials Science & Technology 2022年第29期124卷 141-149页

作者： Chao Liu Reynier I.Revilla Xuan Li Zaihao Jiang Shufeng Yang Zhongyu Cui Dawei Zhang herman terryn Xiaogang Li Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Department of Materials and Chemistry Research Group Electrochemical and Surface EngineeringVrije Universiteit BrusselBrusselsBelgium School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Department of Material Science and Engineering Ocean University of ChinaQingdao 266100China

This work investigated the chemical and electrochemical mechanisms of localised corrosion triggered by CaS·xMgO·y Al_(2)O_(3)·TiN complex inclusions in high strength low alloy steel(HSLAS)under a simulated marine *** focus was given to the role of the TiN portion of the inclusion on the initiation and growth of the corrosion *** thermodynamic process of pitting initiation was investigated by Gibbs free energy,Pourbaix diagram and first principle *** corrosion is mainly induced by inclusions and triggered by dissolution of adjacent distorted *** dissolution of CaS portion in CaS·xMgO·y Al_(2)O_(3)·TiN complex inclusion creates an acidic aggressive environment that accelerates the further dissolution of inclusion and *** coupling effect between TiN inclusion and matrix is directly *** covered with a TiOfilm acts as the cathodic phase in galvanic corrosion,although it has a lower Volta potential than the *** is an unusual correlation with the scanning Kelvin probe force microscopy result,which has been explained for this special system.

关键词： High strength low alloy steel TiN-containing inclusion Localised corrosion Pourbaix diagram First principle calculation

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Long-term deterioration of lubricant-infused nanoporous anodic aluminium oxide surface immersed in NaCl solution

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Journal of Materials Science & Technology 2021年第5期64卷 57-65页

作者： Dequan Wu Lingwei Ma Bei Liu Dawei Zhang Badar Minhas Hongchang Qian herman A.terryn Johannes M.C.Mol Beijing Advanced Innovation Centre for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Department of Materials and Chemistry Research Group Electrochemical and Surface EngineeringVrije Universiteit BrusselBrusselsBelgium Department of Materials Science and Engineering Delft University of TechnologyDelftthe Netherlands

This study investigated the deterioration of a lubricant-infused anodic aluminium oxide surface in a 1M NaCl solution for~200 *** observation by cryo-SEM and quantitative analyses by UV spectroscopy and EIS revealed that the long-term deterioration of the lubricant-infused surface was divided into two stages:the surface-adhered lubricant layer gradually dissolved at a constant rate until the substrate was exposed;afterwards the lubricant infused in the nanochannels began to diffuse and was depleted after~200 *** EIS results also revealed that the defects reduced the corrosion resistance of the lubricant-infused surface considerably.

关键词： Lubricant-infused surface Anodic aluminium oxide Deterioration EIS

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Australasian microtektites across the Antarctic continent: Evidence from the Sør Rondane Mountain range (East Antarctica)

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Geoscience Frontiers 2021年第4期12卷 202-214页

作者： Bastien Soens Matthias van Ginneken Stepan Chernonozhkin Nicolas Slotte Vinciane Debaille Frank Vanhaecke herman terryn Philippe Claeys Steven Goderis Analytical Environmentaland Geo-ChemistryVrije Universiteit BrusselPleinlaan 2BE-1050 BrusselsBelgium Laboratoire G-Time UniversitéLibre de Bruxelles 50Av.F.D.Roosevelt CP 160/02BE-1050 BrusselsBelgium Centre for Astrophysics and Planetary Science University of KentCT27NZCanterburyKentUnited Kingdom Atomic&Mass Spectrometry–A&MS Research Unit Department of ChemistryGhent UniversityCampus SterreKrijgslaan 281–S12BE-9000 GhentBelgium Electrochemical and Surface Engineering Vrije Universiteit BrusselPleinlaan 2BE-1050 BrusselsBelgium

The~790 ka Australasian(micro)tektite strewn field is one of the most recent and best-known examples of impact ejecta emplacement as the result of a large-scale cratering event across a considerable part of Earth's surface(>10%in area).The Australasian strewn field is characterized by a tri-lobe pattern consisting of a large central distribution lobe,and two smaller side lobes extending to the west and ***,we report on the discovery of microtektite-like particles in sedimentary traps,containing abundant micrometeorite material,in the Sør Rondane Mountain(SRM)range of East *** thirty-three glassy particles display a characteristic pale yellowcolor and are predominantly spherical in shape,except for a single dumbbell-shaped *** vitreous spherules range in size from220 to 570μm,with an average diameter of~370μ*** compares relatively well with the size distribution(75–778μm)of Australasian microtektites previously recovered from the TransantarcticMountains(TAM)and located ca.2500–3000 km fromthe *** addition,the chemical composition of the SRM particles exhibits limited variation and is nearly identical to the‘normal-type’(i.e.,<6%MgO)TAM *** Sr and Nd isotope systematics for a single batch of SRM particles(n=26)strongly support their affiliation with TAMmicrotektites and the Australasian tektite strewn field in ***,Sr isotope ratios and Nd model ages suggest that the target material of the SRM particles was composed of a plagioclase-or carbonate-rich lithology derived from a Paleo-or Mesoproterozoic crustal *** affiliation to the Australasian strewn field requires long-range transportation,with estimated great circle distances of ca.11,600 km from the hypothetical source crater,provided transportation occurred along the central distribution *** is in agreement with the observations made for the Australasian microtektites recovered from Victoria Land(ca.11,000 km)and Larkman Nunatak(ca.12,000 km),w

关键词： Impact cratering Impact ejecta Target stratigraphy Volatilization Antarctica Microtektites

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