Abstract
Resistance to atmospheric corrosion in different environments located in Chile and the corrosion’s effect on the mechanical properties of SAE 1020 steel were studied. Atmospheric corrosivity categories at each station under study were determined. These categories were C2, for Laja; C3 and C4, for the Arica and Antarctic stations, respectively; and the most aggressive, C5 and higher at Quintero. These specific environments significantly influenced the mechanical responses of steel exposed for 36 months. Rupture elongation, the modulus of toughness, ultimate tensile strength, and hardness of the material all decreased as a function of environmental atmospheric aggressiveness. Lowered ductility is the result of the increased corrosion rate due to the high deposition of chlorides. This is due to the morphology of material degradation, which consequently occurs as pores, microstrains, and other defects that promote early rupture of the steel.
Highlights
Atmospheric corrosion is a topic of worldwide concern, due to its influence on the shelf life of structural materials
Corrosion on SAE 1020 steel was determined from corrosion rate and corrosion loss during a
The corrosion products formed at the Arica station are irregular, less compact, and do not provide a layer to slow down corrosion rates, due to reduced penetration of aggressive corrosion stimulators to the steel surface
Summary
Atmospheric corrosion is a topic of worldwide concern, due to its influence on the shelf life of structural materials. High economic costs are associated with corrosion, due to the different approaches that each country must take to maintain materials and prevent corrosion [1]. This is most important in areas where the level of environmental aggressiveness is high. Carbon steel is widely used in engineering applications, due to its low cost, ease of manufacture, and properties that satisfy varying design requirements, when environmental and strength conditions are not severe. Atmospheric corrosion of steel can be divided into three stages: the wetting stage, the wet stage, and the drying out stage
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