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| Corrosion Behavior of Low-alloy High Strength Steels in a Simulated Common SO2-containing Atmosphere |
Yongwei SUN( ),Yuping ZHONG,Lingshui WANG,Fangxiong FAN,Yatao CHEN |
| Luoyang Sunrui Special Equipment Co. Ltd., Luoyang Ship Material Research Institute, Luoyang 471000, China |
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Abstract The corrosion resistance of Q345E and Cr-Ni-Cu steels was comparatively assessed by means of potentiodynamic polarization and cyclic immersion corrosion tests in 0.052% (mass fraction) NaHSO3 solution, which aims to simulate the common SO2-containing atmosphere. The characteristic of corrosion rust was studied by means of scanning electron microscope (SEM) and X-ray diffraction (XRD). Results show that the open circuit corrosion potential of Q345E and Cr-Ni-Cu steel are -730 and -705 mV, respectively. The rust layers of two steels contain γ-FeO(OH) and α-Fe phase. Some α-FeO(OH) and Fe3O4 products generate with increasing of the corrosion time. Compared with Q345E steel, the Cr-Ni-Cu steel has lower corrosion rate due to the formation of a much more compact rust layer containing elements such as Cr, Ni and Cu, which are beneficial to corrosion resistance.
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Received: 07 September 2018
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| Fund: Key Projects of Science and Technology of Henan Province(182102210437) |
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Corresponding Authors:
Yongwei SUN
E-mail: weiyong09@163.com
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