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Discoloration of Aluminum Roofing Sheets in Uyo, Nigeria: the Physicochemical Factors

Journal Name:

  • International Journal of Science and Engineering Investigations

Publication Year:

  • 2017

Key Words:

Author NameUniversity of Author
Abstract (2. Language): 
Apart from protecting the inside of a building from wind, weather and other potential hazards, the roof, particularly when designed properly, adds to the overall aesthetics of a building. However, in Uyo, Nigeria, aluminium roofing sheets that should otherwise be largely free from corrosion have been observed to, overtime, develop dark patches and permanent stains that is as unsightly as it is stubborn. To characterise these dark patches, nine parameters were studied in a physicochemical analysis including, total dissolved solids, total suspended solids, sulphates, phosphates, nitrates, biochemical oxygen demand, chemical oxygen demand, salinity and dissolved oxygen. The results point to the fact that organic and inorganic material settle on the roofs and breed algae. About 5.12 – 5.42 mg/kg of phosphates and 2.48 – 2.62 mg/kg nitrates recorded present sufficient nutrient base for simple green plants and algae to thrive on. Further, the measured chloride ion content of the sample from the roofs reveal a salinity level of up to 17.55 mg/l. This level of salinity is sufficient to induce a gradual deterioration of the roof surfaces preventing efficient run-off of rain thereby allowing water to clog in some areas and further attracting organic and inorganic matter.
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REFERENCES

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