Optimum selection of zinc-coated cable trunking systems for electrical installations based on atmospheric corrosion prediction

  • Ernesto Chenoll-Mora Universitat Politècnica de València, España
  • Vicente Agustin Cloquell-Ballester Universitat Politècnica de València, España
  • María Cristina Santamarina-Siurana Universitat Politècnica de València
Palabras clave: Atmospheric corrosion, coatings, trunking, design, project

Resumen

The study presents a methodology for the optimum selection of the most suitable zinc-based coatings in metallic trunking systems to fulfill the requirements related to atmospheric corrosion resistance. The current methodologies are based on heuristic procedures that do not consider the influence of the in situ atmospheric conditions, which are the main cause of most of the corrosion problems. The effect of corrosion over time is generally estimated using a logarithmic function, which depends on corrosion during the first year of exposure, as well as on environmental parameters (e.g. temperature, humidity, pollutants, etc.). Different mathematical models for the prediction of corrosion during the first year of exposure were analyzed. Ten of these models were selected and compared with actual tests determining the model that best fitted the actual values. From this first-year corrosion value, the long-term corrosion function was calculated for each relevant commercial coating. Finally, a case study was analyzed by means of the proposed methodology. The results show the importance of the corrosion function and its influence in the selection of the coating to minimize costs.

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Citas

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Publicado
2018-12-12
Sección
Artículos