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Effect of Atmospheric Corrosion on the Mechanical Properties of SAE 1020 Structural Steel

机译：大气腐蚀对SAE 1020结构钢力学性能的影响

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摘要

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.
机译：研究了位于智利的不同环境中的耐大气腐蚀性能以及该腐蚀对SAE 1020钢力学性能的影响。确定了每个研究站点的大气腐蚀性类别。对于Laja，这些类别为C2。 C3和C4，分别用于Arica和南极站；而最具挑战性的是Quintero的C5和更高这些特定的环境显着影响了暴露36个月的钢的机械响应。材料的断裂伸长率，韧性模量，极限拉伸强度和硬度均随环境大气侵蚀性而降低。延展性降低是由于氯化物的高沉积导致腐蚀速率增加的结果。这是由于材料降解的形态所致，其结果是作为孔隙，微应变和其他缺陷出现，这些缺陷会促进钢的早期断裂。

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