In this paper, the use of digital simulation as a tool to understand electrochemical data is discussed. The various approaches to digital simulation of electrochemical processes will be reviewed, and some applications of these methods to the interpretation of experimental results are presented.
The Ibero-American Map of Atmospheric Corrosiveness (MICAT) project was set up in 1988 sponsored by the International Ibero-American Programme "Science and Technology for Development (CYTED)". Fourteen countries have been involved in the project: Argentina, Brazil, Chile, Colombia, Costa Rica, Cuba, Ecuador, Mexico, Panama, Peru, Portugal, Spain, Uruguay and Venezuela. Research has been conducted both at laboratories and in a network of 72 atmospheric exposure test sites throughout the Ibero-American region, thus considering a broad spectrum of climatological and pollution conditions. This paper presents a summary of some of the results obtained in one-year atmospheric exposure testing of carbon steel, zinc, copper and aluminium: corrosion rate, morphology of attack of the base metal and of the corrosion products formed, their nature and electrochemical properties. The Thematic Network "Anti-Corrosion Protection of Metals in the Atmosphere" (PATINA) was constituted in Lisbon in December 1994, upon the finalization of the MICAT project. The network is participated by the fourteen countries mentioned above plus Bolivia. One of the main tasks of this network is to evaluate the corrosion protection behaviour of a wide range of conventional and advanced coatings in typical atmospheres of the Ibero-American region. This paper presents an overview of the organizational structure of the network and of the coating materials being studied.
The addition of tefra-alkylammonium salts, namely fefra-methylammonium, tefra-ethylammonium, tefra-butylammonium and tefra-hexylammonium salts, to the supporting electrolyte, in the presence of different metal ions, does not change the observed cathodic current for shorter carbon chains. However, an important effect is observed when n > 4 (number of carbon atoms of each chain). This is shown through the polarograms which were recorded for different solutions of cadmium, zinc and manganese ions, in the presence and absence of those ions. The interpretation based on electrocapillary curves has shown that electron transfer through the double-layer becomes more difficult as the length of the carbon chain increases. Polarographic and electrocapillary experiments were followed all over.
