|
|
|
| Formation Characteristic of CO2 Corrosion Product Layer of P110 Steel Investigated by SEM and Electrochemical Techniques |
| ZHAO Guo��xian1,LU Xiang��hong1,XIANG Jian��min2,HAN Yong3 |
| 1. Department of Materials Science and Engineering, Xi��an Shiyou University, Xi��an 710065, Shaanxi, China; 2. Tarim Oil Field, Kuerle 841000, Xinjiang, China;3. Xi��an Maurer Petroleum Engineering Laboratory, Xi��an 710065, Shaanxi, China |
|
|
|
|
Abstract Formation characteristic of CO2 corrosion product layer on the surface of P110 steel was investigated in simulated oilfield environment using mass��loss experiment, potentiodynamic polarization curve, impedance spectroscopy, and SEM micrograph analysis. Samples of different times up to 240 h were tested during exposure. Corrosion product was primarily composed of Fe(Ca,Mg)(CO3)2, which was distinguished by two layers. With an increase in the exposure time, the charge transfer resistance and polarization resistance increased progressively, the uniform corrosion rate decreased, and the corrosion reaction was controlled by the diffusion process instead of the activation process. All phenomena were attributed to the formation of the protective corrosion product layer. More compact and lower porosity of the layer made it more difficult to transfer and diffuse through the corrosion product layer for the charges and ions. Similar results were obtained by electrochemical test and mass��loss experiment.
|
|
Received: 01 January 1900
|
|
|
|
| [1] |
Ying-ying YUE,Cheng-jun LIU,Pei-yang SHI,Mao-fa JIANG,Li-yan QIN,Guang-wei FAN. Descaling Behavior of 430 Hot-rolled Stainless Steel in HCl-based Solution[J]. Chinese Journal of Iron and Steel, 2016, 23(3): 190-196. |
| [2] |
Li-dong WANG, Feng-lei LIU, Qing-yun ZHAO, Hui-bin WU. CO2 Corrosion and Grooving Corrosion Behavior of the ERW Joint of the Q125 Grade Tube Steel[J]. Chinese Journal of Iron and Steel, 2015, 22(10): 943-948. |
| [3] |
Xiang-hong L�J,Fu-xiang ZHANG,Xiang-tong YANG,Jun-feng XIE,Guo-xian ZHAO,Yan XUE. Corrosion Performance of High Strength 15Cr Martensitic Stainless Steel in Severe Environments[J]. Chinese Journal of Iron and Steel, 2014, 21(8): 774-780. |
| [4] |
Cheng-hao LIANG,Hua WANG,Nai-bao HUANG. Effects of Sulphate-reducing Bacteria on Corrosion Behaviour of 2205 Duplex Stainless Steel[J]. Chinese Journal of Iron and Steel, 2014, 21(4): 444-450. |
| [5] |
WANG Shu��lan;Geir Martin Haarberg;Eirin Kvalheim. Electrochemical Behavior of Dissolved Fe2O3 in Molten CaCl2��KF[J]. Chinese Journal of Iron and Steel, 2008, 15(6): 48-0. |
| [6] |
LIN Guan��fa;ZHENG Mao��sheng;BAI Zhen��quan;FENG Yao��rong. Wear Resistance of CO2 Corrosion Product Scale Formed at High Temperature[J]. Chinese Journal of Iron and Steel, 2006, 13(5): 0-47. |
|
|
|
|
2009, Vol. 16 
