Atmospheric Corrosion Of Metallic Roofing Sheet In Building Construction In The Niger Delta Region Of Nigeria
Keywords:
Climate factors, corrosion, galvanization, Niger Delta, synergismAbstract
The unique humid equatorial climate of the coastal Niger Delta region of Nigeria has often been suspected to be a major player in the degradation of metallic building and engineering materials in the region. This study examined the role of dominant climatic factors as well as pollutants' concentrations in the corrosion of galvanized iron roofing sheets in the region. Twelve experimental racks composed of cut pieces of galvanized iron were planted across three sites in the region for one year. Monthly readings of four climatic factors (temperature, relative humidity, rainfall, and wind velocity) and concentrations of aerosol and sulphur dioxide (SO2) were taken at each rack station during the period. The mass loss of each of the specimens was determined at the end of the experiment. The obtained data, both of mass loss and atmospheric factors were subjected to multiple regression analysis and correlation analysis to determine their relative influences in the corrosion plague. It was revealed that there is synergism amongst the factors in their contribution to corrosion impact. Of special note is the fact that the sulphur dioxide was observed not to suit our purpose. To ameliorate the situation, alternative roofing materials that are cheap and durable but less susceptible to corrosion attack as galvanized iron should be explored.
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