<i>This paper presents an experimental and theoretical investigation into water condensation and corrosion under non-corrosion product forming conditions at the top of line in a static, CO<sub>2 </sub>environment. An experimental test cell is developed to measure droplet lifetimes, condensation rates, as well as in situ and integrated corrosion rates (using miniature electrodes and mass loss specimens, respectively), as a function of the surface and gas temperatures, when the gas flow is dominated by natural convection. Experimental results show clearly that that water condensation rate (WCR) is not very influential on corrosion rate at low surface temperatures (T<sub>s</sub>) (particularly below 25<sup>o</sup>C) but becomes much more important at higher surface temperatures (>40<sup>o</sup>C). These findings are summarised in a new empirical correlation for TLC rate as a function of the condensation rate and surface temperature. A model for condensation at the top of the line for static, buoyancy-driven conditions is also presented and is shown to predict dropwise condensation rates accurately for a range of experimental conditions. The developed miniature electrodes for in situ electrochemical measurement are shown to provide an accurate interpretation of the transient response in general corrosion behaviour by giving real-time corrosion rates to complement the mass loss measurement.</i>

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