Evaluation of Atmospheric Corrosivity Indexes in the City of Tuxpan Veracruz

Abstract

Faculty of Chemical Sciences in collaboration with the Institute of Engineering of the Universidad Veracruzana has developed a project for the construction of the Corrosivity Map of the State of Veracruz. Among the activities of the project is the evaluation of the indixes of atmospheric corrosivity in the city of Tuxpan Veracruz, due to the industrial, urban activities and to be located in a coastal area, characteristics that influence the corrosion of metallic materials exposed to the atmosphere. A exposition panel was installed with specimens of aluminum wire on steel screws, copper screws and plastic screws to study corrosivity indexes through mass loss in every season of year, and thus classify the different types of atmospheres; marine, industrial and rural-urban according to the values specified in the standard (ISO 8408, 9223, 9224). Corrosivity indexes obtained indicate a domain of rural-urban atmosphere product of excessive urban activities in the region. Expected to detect high levels of marine atmosphere by the presence of chlorides and particles resulting City location front of coast. However, corrosivity indexes for marine atmosphere are within the limit allowed by the normative.

Atmospheric Corrosion in Metal Materials without and with Coating Systems in Tuxpan, Ver., Mexico

“…However, in other seasons are observed decreased resistance to charge transfer, implying an increase in the corrosion mechanism per activation. The presence or diffusion limited at low frequency facilitates access of aggressive species (Cl-and O 2 ) to the interface through the corrosion product film even more encouraging corrosion (3)(4)(5)(6).…”

“…The iron structure was coated with epoxy paint, to prevent corrosion of it, Figure 2. The determination of suspended particles, chlorides and sulfur dioxide in the atmosphere was carried out using methodologies established in ISO 9225, ISO 9225: 1992 and ASTM G91-97 (3)(4)(5)(6).…”

“…Also atmospheric corrosion is caused by climatic factors and environmental pollution (Cl-, SOx, NOx, COx and particles). The climatic parameters that have a greater influenceon the atmospheric corrosion at temperature, relative humidity, rain fall and wind (direction and speed) (5)(6).…”

“…Corrosivity indexes for the marine (CI-M), Industrial (IC-I) and rural-urban (RU-IC) atmosphere are presented in Figure 1, where RU-IC atmosphere shows a considerable increase in the seasons of spring and winter (Figure 1) mainly exceeding limits permitted by the standard spring, so it is confirmed that the region has conditions of Tuxpan ruralurban atmosphere influenced by aggressive marine atmosphere considerate affecting corrosion of materials exposed to the atmosphere. Monitoring of atmospheric corrosivity indexes in the city of Tuxpan indicate that the weather conditions and the effect of pollutant parameters such as chlorides and sulfur influence the aggressive conditions of the atmosphere of the city being more excessive in summer seasons and spring (3)(4)(5)(6). In Tuxpan the environmental conditions of the region favor atmospheric corrosion, being able to implement programs of prevention and protection, industrial and port metals materials, process equipment and facilities, any equipment being designed according to the prevailing environmental conditions.…”

Weather Conditions, Corrosivity Indexes and Electrochemical Corrosion of Carbon Steel, Copper and Zinc in the Coastal Atmosphere of Tuxpan, Veracruz, Mexico

“…The explanation for these conditions is that different climate conditions, such as temperature, relative humidity, rainfall, direction, and wind speed, influence atmospheric corrosion. Besides climate conditions, the severity of corrosion depends on the levels of atmospheric contamination; therefore, it has been classified into indexes of atmospheric corrosivity for marine type, industrial and rural-urban environments [1][2][3][4].…”