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利用周期浸润腐蚀实验和电化学方法,研究了耐候钢在模拟工业大气环境下的腐蚀演化行为,并利用光学显微镜(OM)、扫描电镜(SEM)和电子探针(EPMA)等分析了实验钢显微组织、腐蚀形貌、锈层特征及腐蚀产物中Cu元素的分布。结果表明,实验钢的组织主要由准多边形铁素体和粒状贝氏体组成;实验钢的腐蚀质量损失率随Cu含量的增加及时间的延长而逐渐降低,且其质量损失量基本相同,锈层厚度逐渐减小,致密度增加;Cu元素在锈层的缝隙和孔洞等缺陷处富集;随着腐蚀时间的增加,自腐蚀电位增大,自腐蚀电流密度下降;含Cu钢锈层促进了阴极还原过程,同时抑制了阳极氧化过程。
The corrosion behavior of weathering steels under simulated industrial atmosphere was studied by means of cyclic wetting corrosion test and electrochemical method. The corrosion behavior of weathering steels was also analyzed by optical microscope (OM), scanning electron microscope (SEM) and electron probe (EPMA) Microstructure, Corrosion Morphology, Rust Layer Characteristics and Distribution of Cu in Corrosion Products. The results show that the microstructure of experimental steel is mainly composed of quasi-polygonal ferrite and granular bainite. The corrosion loss rate of experimental steel decreases with the increase of Cu content and time, and its mass loss is basically the same. The thickness of the layer decreases gradually and the density increases; Cu element is enriched in the cracks and voids of the rust layer; the corrosion potential increases with the increase of corrosion time, the corrosion current density decreases; Cathode reduction process, while inhibiting the anodic oxidation process.