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Comparative Study of the Copper Electrical Earthing Corrosion in Three Mediums in Senegal

A electrical earthing is a low-resistance metallic electrode in close contact with the earth, which is able to conduct default and leaking electric current to the earth. A good electrical earthing allows current circulation trought the earth and protects equipements and persons from electrical risks. In Senegal a foundation earthing with a loop system onto the bottom of building excavation is used on a high majority of new buildings in construction. The same copper is use in all sites for all kinds of buildings (office, school, commercial or medical use). The corrosion resistance of the copper grounding in the soil is very important for the safety and power operation. A quick consumption of copper by corrosion with the presence of electrolyte (natural water exposure) can occurs a matter of safety. We purpose to study the corrosion rates in different water exposures. This work is about a comparative corrosion rates of a copper electrical earthing in diffferent mediums. Those mediums of study are the exposure of three aqueous environments: city water, rainwater and seawater. The purpose of the work is to assess and compare this earthing corrosion rates in those various environments and found the more aggressiveness solution or medium. The physico-chemical datas of aqueous solutions were analyzed and summurised before electrochemicals measurements. The open circuit potential (OCP) is accsess by chronopotentiometry after 2 hours of potential monitoring. The linear polarization with Evans digramm and Tafel extrapolation methods were performed. Those methods show the kinetics of corrosion of copper earthing in city water, seawater and rainwater. The results showed a higher corrosion rate in seawater (32 ?m/year) and low corrosion rates in city water and rainwater (ranging about 2 and 3 ?m/year). For more security of persons and equipments copper earthing require in sea areas more thickness or more control or replacements. This study contributes to increase the safety of electrical power in buildings.

Auteur(s) : El Hadji Alioune Diop, Mouhamadou Fadel Niang, Diadioly Gassama, Ndèye Penda Dione, Modou Fall
Pages : 16-20
Année de publication : 2017
Revue : American Journal of Chemistry
N° de volume : 7
Type : Article
Statut Editorial : open access
Mise en ligne par : FALL Modou