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Zahid Mohammad Mir,Daniel Hoche,Celestino Gomes,Rui Sampaio,Alexandre C. Bastos,Philippe Maincon,M. G. S. Ferreira,Mikhail L. Zheludkevich 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.1
A numerical model for enhanced service life prediction of concrete infrastructure is presented which includes transient analysis of processes during corrosion initiation as well as propagation stage. The temporal and spatial transition of Steel–Concrete Interface during depassivation events is described by a randomly varying chloride threshold function. As such random activation events can be accounted for, rather than having to pre-describe the anode size and location as in many existing models. The aim of the study is to investigate random spatial activation events in concrete structures in submerged zones based on dynamically changing boundary conditions on the rebar surface to control transition from passive to active state. Investigations are carried out to realize the sustainability of corrosion processes in limiting oxygen concentrations in dissolved seawater. The model showcases the numerical architecture, the associated concept of randomly varying chloride threshold and predicts that among other factors, the rate of oxygen strongly influences corrosion rate in submerged locations.
Changing PEO coating formation on Mg alloys by particle additions to the treatment electrolyte
Carsten Blawert,Bala Srinivasan,Jun Liang,Yuanding Huang,Daniel Hoche,Nico Scharnagl,Volker Heitmann,Ulrich Burmester 한국표면공학회 2012 한국표면공학회 학술발표회 초록집 Vol.2012 No.11
Plasma electrolytic oxidation of magnesium alloys is a well known technique to produce corrosion and wear resistant coatings. The addition of particles to the electrolyte provides a possibility to produce coatings with an increasing range of composition by in-situ incorporation of those particles into the coating. An extensive literature review has revealed that the mode of incorporation depends mainly on the melting point of the used particles and the energy provided by the discharges of the PEO process. The spectrum ranges from inert to partly reactive incorporation, but a complete reactive incorporation and a formation of a new single phase coating was not observed so far. Thus a new approach in PEO processing is introduced using specific particles as a kind of sintering additive, changing not only the composition but lowering the melting temperature and increase the liquid phase fraction during the discharges, resulting in a new amorphous coating.