Research Paper
Year: 2018 | Month: December | Volume: 5 | Issue: 12 | Pages: 135-142
Corrosion Susceptibility of Aluminium Step Tile Roofing Sheet
B. C. Chukwudi, T. Agbobonye, M. B. Ogunedo
Mechanical Engineering Department, Imo State University, Owerri.
Corresponding Author: B. C. Chukwudi
ABSTRACT
Step tile aluminium roofing sheets are exposed to the three conditions that necessitate the occurrence of SCC. These conditions are: The tensile stresses as a result of residual stresses from the manufacturing process; a susceptible alloy and a humid or water environment. In view of this, the study aimed at investigating the corrosion susceptibility of Aluminium step tile roofing sheets. The linear polarization resistance method was used in this study to determine the corrosion rate/susceptibility of aluminium roofing sheet. This is because it has an edge over the other non-destructive test methods because it is suitable for both laboratory and in-service conditions. Results show that Aluminium has a high resistance to oxidation when subjected to an external potential as a result of corrosive environment. However, with a corrosion density value of 7.44µA/cm2, the study concludes that Aluminium step tile roofing sheets are susceptible to high degrees of corrosion. Also, with a corrosion penetration speed of 0.081 mm/yr, it would take a minimum of 12 years for a 1mm thick Aluminium roofing sheet to corrode along the depressed regions.
Key words: Corrosion, Susceptibility, Polarization, Resistance, Potential.
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