Field study investigations of the impact of shape, size and orientation on dry deposition induced corrosion of galvanized steel

The Influence of Test-Panel Orientation and Exposure Angle on the Corrosion Rate of Carbon Steel. Mathematical Modelling

“…It can be concluded that the models including the qualitative variables showed very good fit qualities, being difficult to make a clear distinction among them based on their performance (that is, R 2 > 0.91 in all the cases). Anyway, those models including the environmental variables (i.e., models (11), (13), (15) and (17)) exhibited the best fits (with R 2 > 0.94) in comparison with models (7) and (9).…”

“…However, none of these models considered the effects of either the exposure angle (with respect to the horizontal) or the orientation of the tested panel samples. It has been reported in the literature that the orientation of the metal surface and its exposure angle influence the corrosion process thus introducing a further complexity for the development of forecast models [8][9][10][11][12]. Indeed, changes in the time of sun exposure, time of wetness (TOW), dust accumulation, cleaning action of rainfall, etc., occur in these cases.…”

“…Metals are consumed by electrochemical reactions which rates depend on the exposure time (TEXP) but the phenomenon itself is very complex since is also highly dependent on numerous damage factors [4][5][6][7], each of which are extremely variable. These factors include natural air pollutants and anthropogenic sources [4,5], mainly sulfur dioxide (SO 2 ), salinity (chlorides, CL) and other pollutants, such as 'particulate matter' or 'PM', as well as climatic factors such as relative humidity, time of wetness (TOW), temperature, rainfall and wind speed, but also physical characteristics such as shape and type of metal (ferrous or non-ferrous) [4,8], exposure angle [9,10], orientation [8][9][10][11][12] and geographic location [4].…”