Emiel Wettinck
Ghent University
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Featured researches published by Emiel Wettinck.
Progress in Organic Coatings | 2000
Veronique Lavaert; M. De Cock; M Moors; Emiel Wettinck
Silicon polyester coated steel plate is frequently used because of its good corrosion resistance under various conditions. However, if the application of the coating and/or the curing process is carried out too fast, evaporating solvent is enclosed in the coating, forming pores. The aim of this study is to investigate the influence of different types of pores on the corrosion resistance of the above-mentioned coating system by means of electrochemical impedance spectroscopy (EIS). Three different phases in the degradation process could be observed. An almost intact coating area is investigated as reference coating. By simultaneous interpretation of the measured corrosion potential, the evolution of the coating capacitance and its resistance, it can be concluded that this system provides a very good corrosion resistance in a saline environment. A coating containing only small macro-pores (2 μm 100 μm) can even reach the underlying zinc surface. They will strongly decrease the corrosion protection behaviour of the coating.
Journal of Applied Electrochemistry | 2002
Veronique Lavaert; M Moors; Emiel Wettinck
Three different coating conditions influencing the quality of a silicon polyester galvanized steel system were investigated by means of EIS. The first aim was to investigate the influence of different types of pores or discontinuities on the corrosion resistance of the above-mentioned coating system. A second aim was to study the influence of mechanical deformation and damage of the coating on the corrosion behaviour of the coating system. Finally, degradation due to ultraviolet exposure was investigated. In each of these investigations it was possible to distinguish different time constants for different electrochemical events in the Bode phase diagram. Since the difference in magnitude of the values of the resistances was large, they could not be distinguished in the Nyquist plots. Therefore, this type of plot was not used in this work. From the build-up of the coating system and the number of time constants deduced from the EIS measurements, it was possible to model the system. From the model, the physical and electrochemical phenomena occurring during the service life of an imperfect organic coating system was explained.
Progress in Organic Coatings | 2000
Veronique Lavaert; P Praet; M Moors; Emiel Wettinck; B Verhegghe
Abstract In this paper the influence of a mechanical deformation on the corrosion behaviour of a silicon polyester coated galvanised steel is investigated. The electrochemical behaviour of samples subjected to several degrees of uniaxial elongation (1–10% of total strain) is compared with the one of the samples bent over different mandrel diameters. First, the coating aspect of the different types of samples was investigated, by optical microscopy and with scanning electron microscopy (SEM). Strain effects causes damage up to the formation of cracks in the coating. Further, a relationship between the strain introduced by uniaxial deformation and the strain caused by bending of the sample could be formulated. Finally, the influence on the corrosion resistance after uniaxial deformation is compared with that caused by bending deformation. To conclude, it was possible to confirm the theoretically formulated relationship between uniaxial and bending deformation by means of microscopy and by electrochemical techniques.
International Journal of Cast Metals Research | 2003
F Mampaey; Py Li; Emiel Wettinck
The tensile strength of a series of test bars has been determined in the whole section including the casting skin and after gradually reducing the diameter. The tensile test results revealed two different phenomena: a strong effect in the peripheral layer and a slight variation in the central part of the section. Both phenomena have been noted when using various types of non-standardized test bars and different graphite and matrix structures. When the peripheral layer of cylindrical test specimen is removed, the tensile strength increases strongly except for low strength irons. The effect takes place in the outer layer of about 1 mm. When the size of the test bar corresponding to the maximal tensile strength, is further reduced, the tensile strength fluctuates around a constant value.
Isij International | 2006
Liesbeth Barbé; Kim Verbeken; Emiel Wettinck
Proceedings. 4th International Symp. on Waste Processing and Recycling in Mineral and Metallurgical Industries IV. Aug 26-29, 2001, Toronto (Ont) Canada, Ed. Canadian Institute of Mining, Metallurgy and Petroleum | 2001
Marc Verhaege; Emiel Wettinck
Proceedings TMS Fall Extraction & Process Metallurgy Meeting. Symposium : Lead-Zinc 2000, Pittsburgh, Oct 22-25, 2000 | 2013
Kim Verbeken; Marc Verhaege; Emiel Wettinck
Ingeniería Mecánica | 2003
Veronique Lavaert; M Moors; Emiel Wettinck; R. Castañeda; Leonardo Goyos
132nd Annual meeting of the Minerals, Metals and Materials Society (TMS) | 2003
Geert Lissens; Marc Verhaege; Emiel Wettinck; Willy Verstraete
Ingeniería Mecánica | 2002
Veronique Lavaert; M Moors; Emiel Wettinck; R. Castañeda; Leonardo Goyos