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Application of Electrochemical Frequency Modulation (EFM) to Monitor Localized Corrosion and Efficiency of Green Inhibitors (Toepassing van de elektrochemische frequentie modulatie (EFM) techniek voor het monitoren van lokale corrosie en de efficientie va KU Leuven

Amongst existing electrochemical measuring techniques for uniform corrosion, (e.g. LPR, EIS, etc), EFM (Electrochemical Frequency Modulation) has emerged as a promising technique with enormous untapped potential. Besides its use for determining the corrosion rate without a prior knowledge of the so-called Tafel constants, EFM offers the measurement of the corrosion rate, Tafel parameters and causality factors (CFs) in a single set of data. The ...

Modeling localized aluminum alloy corrosion in chloride solutions under non-equilibrium conditions: Steps toward understanding pitting initiation Vrije Universiteit Brussel

Levente-Csaba Abodi, James Derose, Steven Van Damme, Andrei stefan Demeter, Johan Deconinck
A multi ion transport and reaction model has been developed with the intent to improve via simulation the understanding of the first steps of localized corrosion (pitting) of aluminum alloys at the microscale. However, the onset of pitting could not be predicted, but the simulation of all parts of a micropolarization curve, excluding the pitting regime, was possible. Unlike previous models, the model does not use the assumption that the system ...

Role of Al2O3 inclusions on the localized corrosion of Q460NH weathering steel in marine environment Vrije Universiteit Brussel

Chao Liu, Reynier I. Revilla, Dawei Zhang, Zhiyong Liu, Alexander Lutz, Fan Zhang, Xiaogang Li, Herman Terryn

The influence of Al 2O 3 inclusions on the localized corrosion behaviour of Q460NH steel was investigated in a simulated marine environment. According to the current sensing atomic force microscopy (CS-AFM) result, there was no galvanic couple between Al 2O 3 inclusions and the adjacent steel. Therefore, a different mechanism from that traditionally used (considering the galvanic coupling between inclusions and matrix) to explain the ...

Effect of inclusions modified by rare earth elements (Ce, La) on localized marine corrosion in Q460NH weathering steel Vrije Universiteit Brussel

Chao Liu, Reynier I. Revilla, Zhiyong Liu, Dawei Zhang, Xiaogang Li, Herman Terryn

In this work the initial stages of the pitting corrosion in Q460NH weathering steel in a marine environment was studied. To elucidate the effects of inclusions modified by rare earth (RE) elements on pitting corrosion, field emission-scanning electron microscopy-energy dispersive spectrometry (FE-SEM-EDS) analyses, scanning Kelvin probe force microscopy (SKPFM) tests, and a series of immersion tests were conducted. Two main types of ...

Novel use of a micro-optode in overcoming the negative influence of the amperometric micro-probe on localized corrosion measurements Vrije Universiteit Brussel

M. G. Taryba, Krista Van den Bergh, J. De Strycker, Olga Dolgikh, Johan Deconinck, S. V. Lamaka
The local concentration of dissolved oxygen over a metal-coated steel sample of cut-edge geometry was recorded by using either an amperometric probe or an optode (fibre-optic oxygen micro-sensor). Hydroxide ions, being the product of the current determining reaction on the amperometric micro-probe, were found to change the chemical composition of corrosion products. Application of an O2 selective micro-optode for local measurements allows ...

Localized dealloying corrosion mediated by self-assembled monolayers used as an inhibitor system Hasselt University

B. R. Shrestha, Asif Bashir, Genesis Ngwa Ankah, M. Valtiner, Frank RENNER
The structure and chemistry of thiol or selenol self-assembled organic monolayers have been frequently addressed due to the unique opportunities in functionalization of materials. Such organic films can also act as effective inhibition layers to mitigate oxidation or corrosion. Cu-Au alloy substrates covered by self-assembled monolayers show a different dealloying mechanism compared to bare surfaces. The organic surface layer inhibits dealloying ...

Localized study of organic monolayers used as model corrosion inhibitors Hasselt University

Andrea VALENCIA RAMIREZ
Dit proefschrift bevat een overzicht, interpretatie en bespreking van de verkregen resultaten tijdens een doctoraatsproject gesitueerd in het domein van de materiaalfysica. Het hoofddoel van dit project is het bestuderen van het zelfassemblagegedrag evenals de nanomechanische eigenschappen en corrosieinhibitieprestaties van organische moleculen die in aanmerking komen voor toepassing als corrosie-inhibitoren op metalen. Talrijke industrieel ...