Abstract

The effect of Cu and Ni content on the corrosion behaviors of weathering steels in a corrosive atmosphere was investigated using electrochemical measurement techniques, such as electrochemical impedance spectroscopy and linear polarization resistance methods. Scanning electron microscopy with energy-dispersive spectrometry (EDS) and x-ray diffraction (XRD) were used to analyze the samples. The corrosion rates, which are above 2.0 mm a⁻¹ at 48 h and approximately 1.12 mm a⁻¹ at the range of 144-240 h, show that Cu and Ni slowed down the electrochemical reaction at the initial corrosion stage. With an increasing immersion time, the protective properties of the rust layer exhibited an increase in its impedance, and it was enhanced compared to that in the initial stage. The enrichment phenomenon of Cu and Ni elements in the inner rust layer was more evident in the 0.4Cu-0.4Ni and 0.7Cu-0.7Ni steels than that of 0.3Cu-0.3Ni steel after 240 h. The XRD and EDS results show that the inner rust layer contained compositions of CuO and Ni compounds, which filled up the pores located on the corrosion products contributing to the densification of the rust layer.

中文翻译：

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铜和镍的添加对腐蚀性工业环境中耐候钢腐蚀行为的影响

摘要

使用电化学测量技术，如电化学阻抗谱和线性极化电阻方法，研究了铜和镍含量对耐候钢在腐蚀气氛中的腐蚀行为的影响。用能谱仪（EDS）和X射线衍射仪（XRD）进行扫描电子显微镜分析样品。腐蚀速率在48 h时高于2.0 mm a ^-1，在大约1.12 mm a ^-1时在144-240 h范围内，Cu和Ni在初始腐蚀阶段减慢了电化学反应。随着浸泡时间的增加，防锈层的保护性能表现出其阻抗的增加，并且与初始阶段相比有所增强。240 h后，在0.4Cu-0.4Ni和0.7Cu-0.7Ni钢中，内锈层中Cu和Ni元素的富集现象比0.3Cu-0.3Ni钢更明显。XRD和EDS结果表明，内部锈层包含CuO和Ni化合物的成分，这些成分填充了位于腐蚀产物上的孔，有助于锈层的致密化。