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Corrosion management and control skills are based on clear understanding of specific materialenvironment corrosion rates. Atmospheric corrosion is known to account for the greatest material losses on a tonnage basis with amounts that increase with its various location rates. Public information on practicable corrosion rates of 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 procedure. The coupons were exposed in pairs for 36 months at 310 different atmospheric locations of the metropolis where there were many residents, frequent traffic, industrial or commercial processes, open spaces, vegetation, and waste dumps to include possible effects of such variables on the study results. The location corrosion rates of the coupons 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 that the location variables had effects on corrosion rates of the steel but all the rates ranged from low to medium levels and varied randomly from 0.007 to 0.092mm/yr with range 0.085mm/yr, overall mean of 0.0341mm/yr, standard deviation of 0.015mm/yr, and coefficient of variation 44%. The aim of the paper is to provide some applicable predictive supplementary information for corrosion management and control of steel components in assets that should be in appreciable service duration in the metropolitan atmosphere.

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