Corrositivity category maps of a humid tropical atmosphere: the Yucatan peninsula, Mexico

摘要

Fourteen test sites were established in the tropical humid atmosphere of the Yucatan Peninsula and the Mexican Caribbean area. In each environment sulfur dioxide and chloride deposition rates were measured and the corrosion rates of flat platesamples (low carbon steel, copper and zinc) determined. In selected locations open helix samples of copper, and low carbon steel were also tested. In two typical test sites (a rural-urban and a marine-coastal) the time-of wetness and temperature wereregistered, then their influence on the metallic corrosion rates discussed. The obtained data were used for classification of atmospheric aggressivity, according to ISO 9223. It was observed that the aggressivity categories of marine coastal zones are CS, the highest one, while the rural and ruralurban sites classify as C2, C3 and C4. No appreciable difference in category classification is observed, when flat plates or open helix samples are used.