Atmospheric corrosion rates of copper, galvanized steel, carbon steel and aluminum in the metropolitan region of Salvador, BA, Northeast Brazil

摘要

The extension of the Brazilian coast contributes positively to the degradation of materials by the conditions of average temperature and relative humidity (RH%) much higher than in other regions, especially when looking at the coastal areas of Northem and Northeastern Brazil. Salvador is a city of hot and humid, typically tropical, with about 2,466 h annual sunshine, with annual winds speed average of 2.2 m/s, an average annual temperature of 25 °C and annual average RH% of about 81%. These weather conditions coupled with industrial pollution are extremely harmful, providing corrosion or degradation of metallic materials, by having a time of wet surface (t) high (4,000 h/year), in this case, classified by NBR 14643 as high corrosive environment, 14. Based on this information it proposes investigate various aspects to determine the rate of corrosion and deterioration of metals used in electric power transmission and distribution lines (DL) in the metropolitan region of Salvador, Bahia, Brazil.