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RIOS-ROJAS, John Fredy; ESCOBAR-OCAMPO, Diego; HERNANDEZ-GARCIA, Edwin Arbey  and  ARROYAVE, Carlos. Atmospheric corrosivity in Bogota as a very high-altitude metropolis questions international standards. Dyna rev.fac.nac.minas [online]. 2015, vol.82, n.190, pp.128-137. ISSN 0012-7353.

This paper presents the first systematic atmospheric corrosion assessment in Bogota. Main facts about the study are related with special characteristics of the City, such as population (more than eight million inhabitants), and altitude (2600 m over the sea level). Relative humidity, temperature, and sulphate dioxide (SO2) concentration were measured. Simultaneously, corrosion rate of AISI-SAE 1006 plain steel was measured throughout a year. Results show that atmospheric corrosion is between low and medium levels, C2-C3, according to the ISO 9223 standard. Nevertheless, estimations from meteorological parameters produce lower corrosivity and, taking into account SO2 concentrations, corrosivity in places with higher relative humidity, are higher than corrosivity measured on steel coupons. In general, the main pollution problem is particulate matter, but higher corrosion rates were directly associated with SO2 levels. Gaps between found results and international estimation methodologies are evident. Some relative explanations are proposed.

Keywords : Brook's Index; ISO 9223 Standard; relative humidity (Rh); time of wetness (TOW); plain carbon steel; atmospheric pollutants.

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