Bordzilowski J.,Road and Bridges Research Institute |
Krolikowska A.,Road and Bridges Research Institute |
Bonora P.L.,University of Trento |
Maconi I.,University of Trento |
Sollich A.,Atlas Sollich Electronic Systems Ltd.
Progress in Organic Coatings | Year: 2010
The "on site" EIS evaluation of coatings on steel constructions immersed in water or splashed by water is much more difficult than in atmospheric conditions. There are many technical problems with insulation of electrical connections, the mounting and leak tightness of measurement cell and the exclusion of measurement of electric capacitance between the counter electrode and surrounding constructions. These problems were successfully solved by the team of scientists from Road and Bridge Institute, Atlas Sollich Electronic Systems Ltd. and Trento University. The construction of the measurement cell, the investigation method as well as some of the results from "on site" coating investigation were presented. © 2009 Elsevier B.V. All rights reserved.
Bonora P.L.,University of Udine |
Krolikowska A.,Road and Bridges Research Institute
Journal of Corrosion Science and Engineering | Year: 2012
Electrochemistry is not a primary science, since electricity is a corollary of both chemistry and physics, through thermodynamics and kinetics. Its impact in technology, and in chemical engineering too, is limited to special restricted areas, like electrodeposition, energy storage (with the well known and critical limitations), chlor-soda industry and some electrometallurgy (copper, aluminium...), while there is a wide use of electrochemical devices. Provided that corrosion engineering be, outside US, a real profession, corrosion scientists are actually the main copy-writers of electrochemical methods in corrosion research in the laboratory (see, e.g. the proceedings of AETOC workshops) while anticorrosion technologists tend to trust physical and/or mechanical methods both for testing and for monitoring, as well as for forecasting reliability and expectancy of useful service life of structures. Moreover, also in failure analysis often physical, chemical, mechanical test methods are used (SEM, TEM, EDAX,...) instead of electrochemical ones. International Standards concerning electrochemical testing and monitoring methods are rare, and some of them since long time remained in form of Draft (ISO 16773 1 -4 - 2007-2009). In this paper we review the evolution of electrochemical methods in corrosion research and we describe some examples of the few instances when electrochemistry is usefully employed in corrosion control on site: corrosion control of steel pipelines through Rp monitoring, radio-monitored electrochemical noise on US Navy ships, EIS monitoring on steel bridges, EIS monitoring of structures underwater, Rebar corrosion monitoring on concrete viaducts. © 2012 University of Manchester and the authors.
Lekka M.,University of Trento |
Zanella C.,University of Trento |
Klorikowska A.,Road and Bridges Research Institute |
Bonora P.L.,University of Trento
Electrochimica Acta | Year: 2010
The codeposition of hard nanoparticles into metal matrix electrodeposits usually leads to the increase of the coating hardness and abrasion resistance and causes a change to the microstructure of the deposits leading to more compact, nanostructured coatings with an increased corrosion resistance. Very often the laboratory scale results are not easily transferable to an industrial scale due to the introduction of new process variables such as the geometry and the dimensions of the component to coat. The aim of the present work was the study, in laboratory scale, of nano-composite nickel matrix coatings containing SiC nanoparticles and the transfer of this technology in industrial scale. The deposits have been produced using a Watts type bath containing 20 g/l of nanoparticles, under galvanostatic conditions using a current density of 2 A/dm2. The deposits have been studied regarding their microstructure, abrasion and corrosion resistance. Based on the satisfactory results of the laboratory tests, the second part of this work contains the scaling-up and the industrialization of the process and the electrodeposition of the composite coating on ship propeller models and profiles as well as on train axles. The prototype parts were tested under actual working conditions. © 2010 Elsevier Ltd. All rights reserved.