Atmospheric corrosion performance of carbon steel, galvanized steel, aluminum and copper in the North Brazilian coast

Abstract

Para a caracterização, classificação e o mapeamento da corrosividade atmosférica da cidade de São Luís-MA, região costeira do Norte do Brasil, foi desenvolvida uma metodologia baseada na implantação de quinze estações de corrosão atmosférica (ACS) abrangendo diferentes ambientes corrosivos. Nestas ACS foram monitorados, mensalmente, a taxa de deposição dos principais poluentes atmosféricos (íons cloreto, Cl -; gases compostos de enxofre, expressos em SO 2 e partículas sedimentáveis) e os parâmetros meteorológicos, a fim de se obter subsídios para a classificação da corrosividade atmosférica. Em quatro destas ACS foram instalados, além dos módulos de coleta de poluentes, painéis de intemperismo natural com corpos-deprova dos materiais metálicos: aço-carbono, aço galvanizado, alumínio e cobre, metais mais utilizados no setor de distribuição e transmissão de energia elétrica local. Da classificação atmosférica foi elaborado mapa para promover a seleção dos materiais segundo seu desempenho em cada região e diminuir custos diretos e indiretos da corrosão pela extensão da sua vida-útil.The main purpose of this study is to develop a method to characterize and classify the atmospheric corrosivity of the Sao Luis City, located at the Brazilian North coast, establishing 15 atmospheric corrosion sites (ACS), in different environments. These sites were monitored on a monthly basis to determine the deposition rates of atmospheric contaminants, such as airborne salinity, represented by chloride ions (Cl -), sulfur-containing substances, represented by SO 2 and dustfall. These parameters were correlated to meteorological data and both were used to classify the atmospheric corrosivity. At the same time, metallic samples such as low carbon steel, galvanized steel, aluminum and copper, which are commonly used in transmission and distribution power lines, were exposed to the environment in four of these 15 sites, in order to qualify the environmental aggressiveness according to the corrosion rate of these materials. Based on the mapping results, it was possible to determine the materials which are more proper to be used in those specific areas, which could result in the cost reduction due to a span-life extension of such structures.

Atmospheric corrosion of copper exposed to different environments in the region of Valparaiso, Chile

“…The importance of this parameter is related not only to its concentration, but also its form and chemical composition. Solid particles in the form of dust and soot are responsible for increased atmospheric corrosivity due to their hygroscopic properties . The results obtained were 178.91 ± 0.89, 0.39 ± 0.05 and 0.16 ± 0.03 g/m 2 /day, for Quintero, Curauma and Valparaíso, respectively.…”

Physicochemical studies of mild steel corrosion and atmospheric corrosivity mapping of Karachi: An important harbor city of modern Maritime Silk Route

“…Different countries have independently prepared their corrosivity maps confined to the area of their interest. Various countries like China, [3] Switzerland, [4] Slovakia, [5] Turkey, [6] Korea, [7] Brazil, [8] Abu Dhabi, [9] and Spain [10] have already developed their corrosion maps. The current study has developed the first-ever corrosion map for Karachi harbor city, which may be helpful for the researchers and engineers to understand and select methods for general corrosion protection of steel structures like ships, bridges, buildings, and steel truces used in roofing and automobiles.…”

“…It is used as a reference by engineering personnel in the management, planning, designing, and maintenance stages to enhance public engineering structural safety. [1] The corrosion maps of regions such as China, [3] Switzerland, [4] Slovakia, [5] Istanbul, [6] Korea, [7] Brazil, [8] Abu Dhabi, [9] and Spain [10] have been successfully drafted for the assessment of the atmospheric corrosion risks. MICAT is a well-known corrosion mapping project for Ibero-America.…”

Optimization of the atmospheric corrosivity mapping of Guangdong Province

“…Atmospheric corrosivity map provides an important method for atmospheric corrosion risk assessment and prediction because it can give an intuitive and visual result of atmospheric corrosion grades and corrosion risks in different regions, and provide guidance for corrosion protection of materials. The atmospheric corrosion maps of countries and regions such as Switzerland, Slovakia, Istanbul, Korea, Brazil, Abu Dhabi, and Spain have been successively drawn for the assessment of their atmospheric corrosion risks.…”