Effect of Ni on the corrosion resistance of bridge steel in a simulated hot and humid coastal-industrial atmosphere
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第3期
论文作者：Dong-liang Li Gui-qin Fu Miao-yong Zhu Qing Li Cheng-xiang Yin
文章页码：325 - 338
摘 要：The corrosion resistance of weathering bridge steels containing conventional contents of Ni（0.20 wt%, 0.42 wt%, 1.50 wt%） and a higher content of Ni（3.55 wt%） in a simulated hot and humid coastal-industrial atmosphere was investigated by corrosion depth loss, scanning electron microscopy–energy-dispersive X-ray spectroscopy, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and electrochemical methods. The results showed that, with increasing Ni content, the mechanical properties of the bridge steel were markedly improved, the welding parameters were satisfactory at room temperature, and the corrosion resistance was enhanced. When the Ni content was low（≤0.42 wt%）, the crystallization process of the corrosion products was substantially promoted, enhancing the stability of the rust layer. When the Ni content was higher（3.55 wt%）, the corrosion reaction of the steel quickly reached a balance, because the initial rapid corrosion induced the formation of a protective rust layer in the early stage. Simultaneously, NiO and NiFe2O4 were generated in large quantities; they not only formed a stable, compact, and continuous oxide protective layer, but also strongly inhibited the transformation process of the corrosion products. This inhibition reduced the structural changes in the rust layer, thereby enhancing the protection. However, when the Ni content ranged from 0.42 wt% to 1.50 wt%, the corrosion resistance of the bridge steel increased only slightly.
Dong-liang Li，Gui-qin Fu，Miao-yong Zhu，Qing Li，Cheng-xiang Yin
School of Metallurgy, Northeastern University
摘 要：The corrosion resistance of weathering bridge steels containing conventional contents of Ni（0.20 wt%, 0.42 wt%, 1.50 wt%） and a higher content of Ni（3.55 wt%） in a simulated hot and humid coastal-industrial atmosphere was investigated by corrosion depth loss, scanning electron microscopy–energy-dispersive X-ray spectroscopy, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and electrochemical methods. The results showed that, with increasing Ni content, the mechanical properties of the bridge steel were markedly improved, the welding parameters were satisfactory at room temperature, and the corrosion resistance was enhanced. When the Ni content was low（≤0.42 wt%）, the crystallization process of the corrosion products was substantially promoted, enhancing the stability of the rust layer. When the Ni content was higher（3.55 wt%）, the corrosion reaction of the steel quickly reached a balance, because the initial rapid corrosion induced the formation of a protective rust layer in the early stage. Simultaneously, NiO and NiFe2O4 were generated in large quantities; they not only formed a stable, compact, and continuous oxide protective layer, but also strongly inhibited the transformation process of the corrosion products. This inhibition reduced the structural changes in the rust layer, thereby enhancing the protection. However, when the Ni content ranged from 0.42 wt% to 1.50 wt%, the corrosion resistance of the bridge steel increased only slightly.
关键词：
