The European Technical Coatings Congress (ETCC) 2018 was organized in the Beurs van Berlage in Amsterdam June 26-29, 2018. The meeting was for one time combined with the annual CoSi meeting, which is normally held in Noordwijk. The theme of this congress was “Towards a Bright Future, New Coatings Technologies”. Several Dutch companies and Universities contributed to this congress. In total 110 lectures and a big number of posters have been presented.
Because only a limited number of NVVT members were able to attend this congress in Amsterdam the NVVT would like to offer a number of these companies and universities the possibility to present their (updated?) contributions for a broader (NVVT) audience. We hope and expect that also the award winning presentations will be part of the program.
Monitoring corrosion and corrosion protection in bare and coated aluminium by optical-electrochemical hyphenated toolsnull
Electrochemical Impedance Spectroscopy (EIS) is a well-established technique broadly used to monitor corrosion processes and monitor coating properties. Despite the ever increasing literature, effective interpretation of EIS data is not always evident for complicated systems that require mathematical skills and good understanding of the involved physical processes.
In this presentation we propose a simple and inexpensive method to obtain real-time electrochemical and optical information of the corrosion process of metals and coatings immersed in electrolyte. Optical images of the exposed surface are obtained during electrochemical impedance measurements using a home-made 3D printed electrochemical cell. The optically detected surface degradation during immersion in 0.5M and 0.05M sodium chloride gives a better view on the macroscopic corrosion processes compared to impedance measurements. Micrographs constructed from the in-situ optical data enabled the identification of corrosion-features related to intermetallic corrosion (e.g. trenching and meta-stable pitting) and cooperative corrosion (e.g. corrosion-rings, domes and surface-oxides) on a spatiotemporal scale, generally only observed through the use of ex-situ methods. In addition, the corrosion protection potential of different inhibitors at concentrations was studied and the setup was used to evaluate newly developed anticorrosive coatings using nanonetworks and algae exoskeleton carriers. The hyphenation with in-situ optical analysis resulted in a better understanding of the corrosion inhibition and degradation processes revealing, in some cases, new information that could not be obtained by electrochemistry alone.