The Influence of Gas Flare Particulates and Rainfall on the Corrosion of Galvanized Steel Roofs in the Niger Delta, Nigeria
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Abstract
An experiment was conducted to determine the influence of air-borne particulates exuded from gas flare chambers and rainfall/rain water pH in the rusting of metallic building materials, particularly the galvanized iron roofing sheets, in the Niger Delta Region of Nigeria. Gas flaring and rain fall in this region are rated to be amongst the highest in the world. In this experiment, specimens of the metal (galvanized iron) were exposed in the atmosphere for one year, across four sites within the region. The monthly readings of concentrations of particulate matter (aerosol) and rainfall at the sites were recorded. Equally, the average pH values of the collected rainwater were determined and recorded correspondingly. Multiple linear regression, analysis of variance (ANOVA) and Pearson Product Moment Correlation statistical analyses were performed on the obtained data and the outcome indicated that, with an R<sup>2</sup> = 0.678, there was significant influence of industrial aerosol concentration, precipitation and pH on the degradation of galvanized iron roofing material in the region. It was also established that their individual influences were less than their joint impact, suggesting synergism. The ANOVA test further indicated that corrosion was severe in the industrial sites of Ibeno and Ebocha while Ekuri (the control station) recorded the least impact. This study recommends a discontinuation of gas flaring in the region while research on environmentally resilient, relatively cheap and sustainable alternative materials should be encouraged.
- A. K. Kuruvillo, “Life Prediction and Performance Assurance of Structural Materials in Corrosive Environments—A State-of-the-Art Report,” Advanced Materials and Processes Technology Information Analysis Center, Falls Church, 1999.
- J. Guthrie, B. Battat and C. Grethlein, “Accelerated Corrosion Testing,” AMPTIAC Quarterly, Vol. 6, No. 3, 2002, pp. 11-15.
- M. Natesan, S. Selvaraj, T. Manickam and Venkatachari, “Corrosion Behaviour of Metals and Alloys in Marine– Industrial Environment,” Science and Technology of Advanced Materials, Vol. 9, No. 4, 2008, Article ID 045002. doi:10.1088/1468-6996/9/4/045002
- T. E. Graedel, “Effects of Emissions to the Atmosphere on Materials and Cultural Artifacts,” In: V. Galvert, Ed., The Chemistry of the Atmosphere; Its Impact on Global Change, Blackwell, Oxford, 1994, pp. 42-65.
- E. Johansson and M. Linder, “The Influence of Environmental Acidification in the Atmospheric Corrosion of zinc,” Proceedings of 12th International Corrosion Congress, Vol. 2, 1993, pp. 549-560.
- J. Tidblad, A. A. Mikhilov and V. Kucera, “Acid Deposition Effect on Metals in Sub-Tropical Countries: Data Compilation and Temperate Climate Comparison,” SCI Report 2000:8E, Swedish Corrosion Institute, Stockholm, 2000.
- T. E. Graedel and E. Legraf, “Scenarios for Atmospheric Corrosion in the 21st Century,” Electrochemical Society, 2001, pp. 24-30.
- S. Syed, “Atmospheric Corrosion of Materials,” Emirate Journal of Engineering Research, Vol. 11, No. 1, 2006, pp. 1-24.
- J. Tidblad, V. Kucera, F. Samie, S. N. Das, C. Bhamornsut, L. C. Peng, K. L. So, Z. Dawei, L. T. H. Lien, H. Schollenberger, C. V. Lungu and D. Simbi, “Exposure Programme on Atmospheric Corrosion Effects of Acidifying Pollutants in Tropical and Subtropical Climates,” Water, Air and Soil Pollution Focus, Vol. 7, No. 1-3, 2007, pp. 241-247. doi:10.1007/s11267-006-9078-6
- A. E. Obia, “Environmental Impact of Atmospheric Pollutants on Galvanized Iron Sheets in the Niger Delta Region of Nigeria,” Ph. D. Thesis, University of Calabar, Calabar, 2008.
- World Bank, “Defining an Environmental Strategy for Niger Delta (1),” World Bank Confidential Report, Washington DC, 1995.
- E. Uyigue and M. Agho, “Coping with Climate Change and Environmental Degradation in the Niger Delta of Southern Nigeria,” Community Research and Development Centre, Benin City, 2007.