The aim of this study is to assess the main factors that affect the behaviour of carbon steel and galvanised steel in tropical and non‐tropical marine environments, identifying those factors that directly affect the behaviour. The results from the INNOVA (Chile) and MICAT/PATINA (Venezuela) projects will be used. These projects evaluated metals exposed to different marine environments using procedures outlined in ISO 9223/9226. The results show that temperature has no significant effect on the behaviour of the materials at the study sites in question (Venezuela being 10 °C warmer than Chile), independent of the tropical nature of the exposure environment, while it is precipitation (>600 mm) and chloride and SO2 content in the environment that mainly influence the behaviour of the carbon steel and the galvanised steel. In addition, an artificial neural network was generated to evaluate the corrosion rate of the studied metals, using meteoro‐chemical variables. The neural network for the carbon and galvanised steel was more precise for the exposure sites located in Chile.

onThis article presents the results obtained for the atmospheric corrosion of copper after 3 years of exposure at different sites within the region of Valparaiso, Chile. Frames were installed with samples at seven sites located close to the coast and inland. They were accompanied by devices to measure atmospheric chloride and sulphur dioxide content and weather stations to obtain data on temperature, humidity, amount of rainfall and wind speed. The results show a correlation between corrosion rate and the environmental and meteorological conditions in the area, and with the morphology and electrochemical properties of the corrosion product formed on the copper surface. The sites gave corrosivity categories of C5, C4, C3 and C2. The behaviour of corrosion rate was modelled using power function models and neural networks. The main corrosion products were cuprite, posnjankite, covelite and atacamite. O (M) Covelite, CuS (t) Cuprite, Cu 2 O (M) Covelite, CuS (t) Valparaíso Cuprite, Cu 2 O (M) Covelite, CuS (M) Atacamite, Cu 2 Cl(OH) 3 (M) Brochantite, Cu 4 (SO 4 )(OH) 6 (t) Atacamite, Cu 2 Cl(OH) 3 (M) Covelite, CuS (M) Cuprite, Cu 2 O (t) Thenardite, Na 2 SO 4 (t) M, major; m, minor; t, traces.

The present work presents the behavior of carbon steel and galvanized steel against atmospheric corrosion after 3 years of exposure at seven locations around the region of Valparaiso, Chile. Results show a relation between corrosion rates and environmental and meteorological conditions, categorized as CX for the Quintero zone, and C3 and C2 in the remaining six zones. Corrosion rate behaviors and material toughness losses were modeled using power functions and neural networks, found to be a function of environmental exposure time. Losses were greater for carbon steel in coastal and industrial environments, reaching 70 to 80%. This effect was reduced in galvanized steel, not exceeding 15% over the same period of exposure. The relationship between corrosion rate and loss of toughness of both materials was modeled using neural networks. K E Y W O R D S atmospheric corrosion, carbon steel, galvanized steel, industrial environments, marine environments, SEM, toughness, weight loss, XRD

Palabras clave: Corrosión atmosférica, mapa de corrosión de Chile, acero al carbono, acero galvanizado, cobre y aluminio.

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