The Influence of Gas Flare Particulates and Rainfall on the Corrosion of Galvanized Steel Roofs in the Niger Delta, Nigeria

Ajah Ekpeni Obia, Hanson Effiong Okon, Samuel Aji Ekum, Eyo Effiom Eyo-Ita, Ekpang Ajah Ekpeni

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DOI: 10.4236/jep.2011.210154                

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 R² = 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.

Keywords

Galvanized Iron, Gas Flares, Mass Loss, Pollutants, Rainfall

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	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.
[2]	J. Guthrie, B. Battat and C. Grethlein, “Accelerated Corrosion Testing,” AMPTIAC Quarterly, Vol. 6, No. 3, 2002, pp. 11-15.
[3]	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
[4]	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.
[5]	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.
[6]	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.
[7]	T. E. Graedel and E. Legraf, “Scenarios for Atmospheric Corrosion in the 21st Century,” Electrochemical Society, 2001, pp. 24-30.
[8]	S. Syed, “Atmospheric Corrosion of Materials,” Emirate Journal of Engineering Research, Vol. 11, No. 1, 2006, pp. 1-24.
[9]	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
[10]	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.
[11]	World Bank, “Defining an Environmental Strategy for Niger Delta (1),” World Bank Confidential Report, Washington DC, 1995.
[12]	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.
[13]	I. J Ekpoh, and A. E. Obia, “The Role of Gas Flaring in the Rapid Corrosion of Zinc Roofs in the Niger Delta Region of Nigeria,” Environmentalist, Vol. 30, No. 4, 2010, pp. 347-352. doi.:10.1007/s10669-010-9292-7.
[14]	R. O. Idris, ”Impacts of Oil Spillage and Gas Flaring on the Population and Distribution of Birds in the Niger Delta region of Nigeria: A brief Interim Report Prepared for ABC Conservation Fund, United Kingdom,” 2010. www.africanbirdclub.org.
[15]	Wikipedia, “Environmental Issues in the Niger Delta,” 2010. http://en.wikipedia.org/wiki/sustainability/.
[16]	D. O. Egbuna, “The Environmental Hazard of Nigerian Natural Gas,” Proceedings of an International Seminar on the Petroleum Industry and the Nigerian Environment, Lagos, September 1987, pp. 346-351.
[17]	M. Moniruzzaman and A. S. M. A. Haseeb, “Investigation into the Causes of Premature Corrosion of Pre-Fabri- cated Steel Factory Building,” Journal of Mechanical En- gineering, Vol. ME40, No. 2, 2009, pp. 90-94.
[18]	L. Chotimongkol, C. Barmornsut,, R. Nkuntool, N. Kaev- monkol, S. Sulphonlai, E. Vitiat, I. Cole and A. Neufeld, “Corrosion Monitoring of Metallic Building and Infrastructural Metals in Thailand,” Proceeding of Asian-Pacific Corrosion Control Conference, Ho Chi Minh City, Vol. 2, 1999, pp. 555-570.
[19]	L. T. H. Lien, P. T. San and H. L Hong, “Results of Studying Atmospheric Corrosion in Vietnam 1995-2005,” Science and Technology of Advanced Materials, Vol. 8, No. 7-8, 2007, pp. 552-558. doi:10.1016/j.stam.2007.08.011.
[20]	E. B. Eze, “Statistics in Environmental Management,” Dia- geg Nigeria Enterprises, Calabar, 2005.
[21]	C. T. I. Odu, “Gas Flare Emissions and Their Effects on the Acidity of Rain Water in the Ebocha Area,” University of Ibadan, Ibadan, 1994.