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The estimation of zinc protective layer thickness (or corrosion life) on steel substrate provides a key part for the optimum selection of zinc coating thickness that is tailored to the specific outdoo...r environmental conditions at the location for the requisite design life of steel structures. In this study, the estimation of first-year corrosion rate and/or corrosion thickness loss of zinc protective layer on steel substrate has been done using the methodology outlined in ISO 9223 and 9224 based on dose-response function for sixteen sites representing diverse outdoor atmospheric conditions. The results apparently revealed that the estimated first-year corrosion rate of zinc was lowest in the rural atmosphere followed by the urban-industrial, mixed, and marine atmosphere; however, it is not so for every site and in every case due to the stochastic character of corrosion as it depends on various environmental factors. The comparative analysis of estimated and observed first-year corrosion rate of zinc layer revealed that the variation was within ±13% (-0.36 to +0.17 μm) at 26.67% sites, ±45% (-0.22 to +0.46 μm) at 33.33% sites and ±87% (-0.23 to +1.98 μm) at 20% sites; and very high observed corrosion rate up to 213% (-5.84 to -1.01 μm) at 13.33% sites and up to 750% (-2.90 μm) at 6.67% sites. Thus, about 60% of the sites have an uncertainty level of zinc within expected and acceptable limits as per ISO 9223. Further, based on the estimated first-year corrosion rate of the zinc layer, atmospheric corrosivity categories have been assigned to the sites as per ISO denomination. Thereafter, the corrosion thickness of the zinc layer required for steel structures has been estimated on a short- and long-term (>20 years) basis for the sites.続きを見る
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Mendeley出力
p1753-1762