Atmospheric corrosivity in Bogota as a very high-altitude metropolis questions international standards

Abstract

<p>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 SO2 concentration were measured. Simultaneously, corrosion rate of AIS/SAE 1006 plain steel was measured along one year. Results show that atmospheric corrosion is between C<sub>2</sub> – C<sub>3</sub> levels, according to the ISO 9223 standard. Nevertheless, estimations from meteorological parameters produce lower corrosivities and, taking into account SO2 concentrations, corrosivities in places with higher relative humidity, are higher than corrosivities 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 explanations about that, are proposed.<strong></strong></p>

Atmospheric corrosion of carbon steel: Results of one-year exposure in an andean tropical atmosphere in Colombia

“…Conversely, site 1 in this study manifests a corrosion rate positioned at a midpoint, comparable with other sites as Hanoi (Vietnam) [ 26 ]. Sites 2 and 5 exhibit corrosion rates at the lower end of the spectrum reported for such atmospheres; however, it is worth noting that these values have also been reported by other authors [ 6 , [27] , [28] , [29] ].…”

“…6 ). It is noteworthy that all these sites fall within the classification of urban or industrial-urban atmospheres [ 6 , [23] , [24] , [25] , [26] , [27] , [28] , [29] ].

Fig.

…”

Annual atmospheric corrosion rate and dose-response function for carbon steel in Bogotá

“…A former research reported that atmospheric corrosion of carbon steel in Bogotá was less than 50 μm yr -1 (400 g m -2 yr -1 ) according to meteorological parameters and pollutant concentration data collected by the city network of environmental assessment during several years, and there was mass loss of carbon steel after one year of exposure (Ríos Rojas et al, 2015). Nevertheless, a damage function of carbon steel corrosion from measurements of standard specimens was not found.…”

Marine atmospheric corrosion of carbon steel in the tropical microclimate of Port Louis

“…Major salinity differences may also exist between the shores of one side of a country and the other side as each region varies in terms of its characteristics pertaining to the corrosion behaviour of materials. [ 7 ] In Mexico, for example, the corrosion rate for the northern coast is 362.4 µm annum −1 (µm a –1 ), which is significantly higher than the corrosion rate of 91.3 µm a –1 obtained for the southern coast. [ 8 ]…”