Selección óptima del tipo de recubrimiento metálico de los sistemas de canalización eléctrica basada en su resistencia a la corrosión

Abstract

The selection in an industrial project of the most suitable type of coating of the electrical trunking systems to guarantee its resistance to atmospheric corrosion, as well as the required cost, is currently based on heuristic calculation procedures, not taking into account the influence of atmospheric conditions. The corrosion-time function is logarithmic and depends on the corrosion of the first year of exposure and on environmental parameters. This investigation is divided into two parts; the first one is focused on the traditional zinc-based coatings, for which ten mathematical models have been selected for the prediction of corrosion in the first year and which have been compared with field tests, in order to select the one that best fits and subsequently, calculate the long-term corrosion function. The second part is focused on the new alloys based on zinc-aluminum-magnesium (ZM), for which field and accelerated corrosion tests have been analyzed, obtaining very clear conclusions, and allowing to make a first approximation of the corrosion-time function. These results show the logarithmic behavior of the corrosion function and the need to take it into account to minimize the impact on the cost of the project.