|
|
|
| Influence of Inclusion on Corrosion Behavior of E36 Grade Low-alloy Steel in Cargo Oil Tank Bottom Plate Environment |
| Hui-bin WU,Jin-ming LIANG,Di TANG,Xiao-tong LIU,Peng-cheng ZHANG,Yuan-jie YUE |
| National Engineering Research Center of Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China |
|
|
|
|
Abstract Corrosion behavior of low-alloy steel was investigated in simulated cargo oil tank (COT) bottom plate service environment (10% NaCl solution, pH=0.85). The corrosion behavior of inclusion was studied by in-situ scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). It was found that pitting corrosion was inclined to occur around the place where inclusions exist. After initial corrosion, an area of 10-20 ��m in diameter was formed as a circinate cathode around the edge of inclusion. MnS inclusion dissolved in the simulated COT corrosion solution before low-alloy steel matrix, and pitting was formed at the place where MnS dissolved. TiO2 inclusion dissolved in the simulated COT corrosion solution after low-alloy steel matrix, and pitting was formed at the place where steel matrix dissolved. The corrosion tended to occur at the area where the curvature radius of inclusion is smaller. The size of round TiO2 inclusions had little influence on corrosion behavior in this certain environment.
|
|
Received: 24 September 2013
Published: 13 November 2014
|
| Fund:National Outstanding Youth Science Foundation of China;National Outstanding Youth Science Foundation of China |
|
Corresponding Authors:
hui-bin
E-mail: huibinwu2013@163.com
|
|
|
|
| [1] |
Jin��shan WEI,Yan��chang QI,Zhi��ling TIAN,Yun PENG. Corrosion Behavior of Welded Joints for Cargo Oil Tanks of Crude Oil Carrier[J]. Chinese Journal of Iron and Steel, 2016, 23(9): 955-962. |
| [2] |
Dan SONG,,,Wei SUN,Jin-yang JIANG,Han MA,Jian-chun ZHANG,Zhao-jun CHENG. Corrosion Behavior of Cr Micro-alloyed Corrosion-resistant Rebar in Neutral Cl--containing Environment[J]. Chinese Journal of Iron and Steel, 2016, 23(6): 608-617. |
| [3] |
Zhao-jun CHENG,Dan SONG,,,Jin-yang JIANG,Jing-hua JIANG,Xiao-long MA,Kai YOU,Ai-bin MA,. Microstructure Characteristic and Electrochemical Corrosion Behavior of Surface Nano-crystallization Modified Carbon Steel[J]. Chinese Journal of Iron and Steel, 2016, 23(12): 1281-1289. |
| [4] |
Gu-jun CHEN,Sheng-ping HE,Yin-tao GUO,Bo-yi SHEN,Shuo ZHAO,Qian WANG. Optimization of Calcium Addition to High-strength Low-alloy Steels[J]. Chinese Journal of Iron and Steel, 2015, 22(7): 590-597. |
| [5] |
Jian LI,,Hang SU,Feng CHAI,Xiao-ping CHEN,Xiang-yang LI,Hui-min MENG. Simulated Corrosion Test of Q235 Steel in Diatomite Soil[J]. Chinese Journal of Iron and Steel, 2015, 22(4): 352-360. |
| [6] |
ZHOU Yan-lei,CHEN Jun,LIU Zhen-yu. Corrosion Behavior of Rusted 550 MPa Grade Offshore Platform Steel[J]. Chinese Journal of Iron and Steel, 2013, 20(3): 66-73. |
|
|
|
|
2014, Vol. 21 
