席文强,孙冲,樊学华,林学强,孙建波.CO2和H2S对镍基合金028点蚀敏感性及点蚀生长动力学的影响[J].表面技术,2024,53(16):78-88, 102.
XI Wenqiang,SUN Chong,FAN Xuehua,LIN Xueqiang,SUN Jianbo.Effects of CO2 and H2S on Pitting Sensitivity and Pitting Growth Kinetics of Nickel-based Alloy 028[J].Surface Technology,2024,53(16):78-88, 102 |
| CO2和H2S对镍基合金028点蚀敏感性及点蚀生长动力学的影响 |
| Effects of CO2 and H2S on Pitting Sensitivity and Pitting Growth Kinetics of Nickel-based Alloy 028 |
| 投稿时间：2023-09-11 修订日期：2023-11-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.16.006 |
| 中文关键词: 镍基合金 CO2 H2S 点蚀敏感性 一维人工凹坑电极 点蚀生长动力学 |
| 英文关键词:nickel-based alloy CO2 H2S pitting sensitivity one-dimensional artificial pit electrode pitting growth kinetics |
| 基金项目:中央高校基本科研业务费专项(20CX06075A) |
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| Author | Institution |
| XI Wenqiang | School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China |
| SUN Chong | School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China |
| FAN Xuehua | School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China;China Petroleum Engineering & Construction Co., Ltd., Beijing Company, Beijing 100085, China |
| LIN Xueqiang | School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China |
| SUN Jianbo | School of Materials Science and Engineering, China University of Petroleum East China, Shandong Qingdao 266580, China |
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| 中文摘要: |
| 目的 探明CO2和H2S对镍基合金028钝化膜性能和点蚀敏感性的影响。方法 采用循环动电位极化(CPP)、电化学阻抗谱(EIS)、莫特-肖特基(M-S)等测试方法，研究Cl−环境、CO2-Cl−环境和H2S-Cl−环境中镍基合金028的钝化膜性能。通过制备一维人工凹坑电极模拟点蚀坑的稳态生长，采用向负向电位扫描法，研究镍基合金028在局部点蚀环境中的金属溶解动力学，明确CO2和H2S对点蚀生长动力学的影响。结果 CO2和H2S都会使镍基合金028钝化膜性能变差，而H2S的影响更为显著，具体表现为:在H2S-Cl−环境中具有更高的钝化电流密度jp、更低的点蚀电位Eb和再钝化电位Erp。H2S-Cl−环境中的钝化膜电阻Rf、电荷转移电阻Rt和钝化膜厚度均低于CO2-Cl−环境中的，此外，钝化膜在H2S-Cl−环境中具有更高的点缺陷密度。在最大点蚀坑溶解电流密度jdiss,max相同的条件下，H2S-Cl−环境中点蚀稳态生长所需的驱动力Emax明显低于CO2-Cl−环境中的;在相同Emax下，H2S-Cl−环境中的jdiss,max高于CO2-Cl−环境中的。结论 CO2和H2S通过增加钝化膜溶解速率、降低钝化膜电阻和增加点缺陷密度，不同程度地增加了镍基合金028的点蚀敏感性，而H2S更容易造成钝化膜损伤。在点蚀稳态生长阶段，镍基合金028点蚀的稳态生长遵循塔菲尔规律，相比于CO2，H2S更容易促进点蚀从亚稳态向稳态发展，并且在H2S环境中具有更高的点蚀生长稳定性。 |
| 英文摘要: |
| In the development process of sour oil and gas fields, the presence of corrosive substances such as CO2, H2S and Cl– poses a major threat to the service safety of underground pipes, and also puts higher requirements for the service performance of materials. Nickel-based alloys are widely used in highly sulfuric acid oil and gas fields due to their excellent corrosion resistance. Despite this, the protective properties of surface films can be seriously affected in harsh corrosive environments. Local damage to the surface film can induce the initiation and development of pitting corrosion, and ultimately leading to material failure. Therefore, local corrosion dominated by pitting corrosion will be the biggest corrosion problem faced by nickel-based alloys. In this study, nickel-based alloy 028 was examined as the research object. The effects of surface passivation films and pitting steady-state growth on the pitting corrosion performance of nickel-based alloy 028 were considered comprehensively. The passivation film properties and metal dissolution kinetics of nickel-based alloy 028 in CO2 and H2S environments were studied by in-situ electrochemical test and one-dimensional artificial pit electrode technology. Additionally, the effects of CO2 and H2S on pitting sensitivity and pitting growth kinetics of nickel-based alloy 028 were discussed. The work aims to investigate the effects of CO2 and H2S on the passivation film properties and pitting sensitivity of nickel-based alloy 028. Cyclic potentiodynamic polarization test (CPP), electrochemical impedance spectroscopy test (EIS), and Mott-Schottky test (M-S) were adopted to study the passivation film properties of nickel-based alloy 028 in the Cl–environment, the CO2-Cl− environment and the H2S-Cl− environment. The steady-state growth of pitting was simulated by one-dimensional artificial pit electrode, and the metal dissolution kinetics of nickel-based alloy 028 in the local pitting corrosion environment was studied by downward potential scan. The effects of CO2 and H2S on the pitting growth kinetics of nickel-based alloy 028 were clarified. Both CO2 and H2S would worsen the stability of nickel-based alloy 028 passivation films, and the effect of H2S was more significant, which was manifested in higher passivation current density (jp), lower pitting potential (Eb) and repassivation potential (Erp) in the H2S-Cl− environment. The passivation film resistance (Rf), charge transfer resistance (Rt) and passivation film thickness in the H2S-Cl– environment were lower than those in the CO2-Cl− environment, and the passivation film had a higher point defect density in the H2S-Cl− environment. Under the same condition of the maximum pit dissolution current density (jdiss, max), the presence of CO2 and H2S would reduce the threshold value (Emax) of nickel-based alloy 028 to achieve steady growth of pitting corrosion, while the Emax of the H2S-Cl− environment would be lower. At the same pitting driving force (Emax), the H2S-Cl− environment had a higher maximum pit dissolution current density (jdiss,max) than in the CO2-Cl− environment. In the pitting initiation stage without stable pitting corrosion, the addition of CO2 and H2S reduces the protective performance of the passivation film, enhances the nucleation ability of the pitting corrosion, and ultimately increases pitting susceptibility, among which the role of H2S is more obvious. In the steady-state growth stage of pitting corrosion, the steady-state growth of nickel-based alloy 028 pitting corrosion follows the Tafel's law. When the maximum pit dissolution current density is same, the threshold value for steady-state pitting corrosion of nickel-based alloy 028 in the H2S-Cl− environment is lower than that in the CO2-Cl− environment, which is easier to promote the development of metastable pitting to steady-state pitting corrosion. Under the same driving force of pitting growth, H2S can cause a higher maximum pit dissolution current density of nickel-based alloy 028 than CO2, so nickel-based alloy 028 has higher pitting growth stability in the H2S-Cl− environment, which in turn reduces the pitting resistance of nickel-based alloy 028. |
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