A Field Study of Outdoor Atmospheric Corrosion Rates of Mild Steel around Kaduna Metropolis

International Journal of Mechanical Engineering

© 2018 by SSRG - IJME Journal

Volume 5 Issue 11

Year of Publication : 2018

Authors : T.N.Guma, James A.Abu

10.14445/23488360/IJME-V5I11P102

How to Cite?

T.N.Guma, James A.Abu, "A Field Study of Outdoor Atmospheric Corrosion Rates of Mild Steel around Kaduna Metropolis," SSRG International Journal of Mechanical Engineering, vol. 5,  no. 11, pp. 7-21, 2018. Crossref, https://doi.org/10.14445/23488360/IJME-V5I11P102

Abstract:

Corrosion management and control skills are based on a clear understanding of specific material-environment corrosion rates. Atmospheric corrosion accounts for the greatest material losses on a tonnage basis with amounts that increase with its various location rates. Public information on practicable corrosion ratesof carbon steel as the commonly employed metallic material in open-air structures was found lacking for Kaduna metropolis--a top industrial, commercial, and populous center in Nigeria. Ascertained mild steel sheet was used to produce 620 similar panel coupons for the test in principle to ISO 9226 2013. The coupons were exposed in pairs for 36 months at 310 different atmospheric locations of the metropolis. Many residents, frequent traffic, industrial or commercial processes, open spaces, vegetation, and waste dumps, including possible effects of such variables on the study results. Thecoupons' location corrosion rates were systematically determined at the end of the duration through their respective average pair weight losses. Statistical analyses of variance at F0.01 level of significance and dispersion of the overall obtained rate data was conducted. The analyses indicated thatthe location variables had effects on corrosion rates of the steel. Still, allthe rates ranged from low to medium levels and varied randomlyfrom 0.007 to 0.092mm/yr with a range of 0.085mm/yr, overall mean of 0.0341mm/yr, the standard deviation of 0.015mm/yr, and coefficient of variation 44%. The paper aims to provide some applicable predictive supplementary information for corrosion management and control of steel components in assetsthat should be in appreciable service duration in the metropolitan atmosphere.

Keywords:

Atmospheric conditions, relative humidity, pollutants, Corrosivity, variations,steel structures, durability, design and maintenance, Kaduna metropolitan area, practicable control data.

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