Abstract

This study discusses the comparative weatherability of three microstructures of ferrite, ferrite + bainite, and bainite, obtained by controlling the rolling and cooling processes of a well-established weathering steel by adding 3 wt% Ni in tropical marine atmospheric environments. In field exposure in the Trat (Thailand) and accelerated laboratory testing, the bainitic steel showed superior weathering resistance compared to the other microstructures. The corrosion rates after 12-month of exposure were 0.012 mm/y for ferritic steel, 0.010 mm/y for ferritic + bainite steel, and 0.009 mm/y for bainitic steel. An analysis of the electrochemical properties of the rust layer, its phase composition, and morphological observations revealed that the influence of microstructure on the atmospheric corrosion rate of weathering steels primarily depend on the density of the rust and the adhesion between the rust layer and the substrate.

Graphic Abstract

中文翻译：

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微观结构对热带海洋大气环境中 3Ni 耐候钢腐蚀行为的影响：室外暴露和室内测试

摘要

本研究讨论了铁素体、铁素体+贝氏体和贝氏体三种微观结构的耐候性比较，这三种微观结构是通过在热带海洋大气环境中添加 3 wt% Ni 来控制成熟耐候钢的轧制和冷却过程而获得的。在达叻府（泰国）的现场暴露和加速实验室测试中，与其他微观结构相比，贝氏体钢表现出优异的耐候性。暴露12个月后，铁素体钢的腐蚀率为0.012毫米/年，铁素体+贝氏体钢为0.010毫米/年，贝氏体钢为0.009毫米/年。对锈层电化学性能、相组成和形貌观察的分析表明，微观结构对耐候钢大气腐蚀速率的影响主要取决于锈层的密度以及锈层与基体的附着力。 。

图文摘要