海水流速对DH36平台钢阴极保护的影响

doi:10.11902/1005.4537.2013.183

中国腐蚀与防护学报

2014, Vol. 34

Issue (6): 550-557 DOI: 10.11902/1005.4537.2013.183

本期目录 | 过刊浏览

海水流速对DH36平台钢阴极保护的影响

范丰钦¹, 宋积文², 李成杰¹, 杜敏¹(

)

1. 中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室青岛 266100
2. 中海油能源发展股份有限公司北京分公司信息技术发展中心北京 100027

Effect of Flow Velocity on Cathodic Protection of DH36 Steel in Seawater

FAN Fengqin¹, SONG Jiwen², LI Chengjie¹, DU Min¹(

)

1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2. CNOOC Energy Technology & Services Limited Beijing Branch Information Technology Development Center, Beijing 100027, China

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摘要:

利用自行设计的管流式海水循环实验装置模拟在0.20~2.00 m/s流速范围内的阴极保护情况,采用恒电流极化法进行阴极保护,通过电位的变化、电极宏观形貌和钙质沉积层的生成情况评价阴极保护效果。结果表明,流速越大,电位达到保护电位-800 mV (vs Ag/AgCl海水) 时所需的电流密度越大；而且当流速大于1.20 m/s时,即使电位达到了保护电位仍可能发生明显的冲刷腐蚀；生成的钙质沉积层主要是单层的富镁层,只有电流密度较大时,才会在富镁层上进一步沉积富钙层。

关键词 ：阴极保护, 海水流速, 保护电流密度, 钙质沉积层, 恒电流极化

Abstract：

A series of cathodic polarization experiments for DH36 steel has been performed with seawater flow in a range of flow velocities: 0.20, 0.40, 0.60, 0.80, 1.00, 1.20, 1.40 and 2.00 m/s in a pipe flow circulating seawater device. For each flow velocity, at least three different polarization current densities were chosen to perform galvanostatic cathodic polarization for 7 d. The results showed that the current density demand for an adequate cathodic protection (CP) increased with the flow velocity; the potential could be also polarized to achieve -800 mV vs the silver/silver chloride (seawater) reference electrode (Ag/AgCl [sw]) when the velocity was up to 1.00 m/s; however when the velocity was above 1.20 m/s, erosion-corrosion probably could occur even the polarization potential has achieved the protective potential; the calcareous deposits formed on the steel surface were most single magnesium-rich layers. Exceptionally, calcium-rich deposits could form on top of the magnesium-rich layer only when a very high current density was applied.

Key words： cathodic protection flow velocity protection current density calcareous deposit galvanostatic polarization

ZTFLH:

TG174.3

作者简介: null

范丰钦，男，1989年生，硕士生，研究方向为金属腐蚀与防护

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引用本文:

范丰钦, 宋积文, 李成杰, 杜敏. 海水流速对DH36平台钢阴极保护的影响[J]. 中国腐蚀与防护学报, 2014, 34(6): 550-557.
Fengqin FAN, Jiwen SONG, Chengjie LI, Min DU. Effect of Flow Velocity on Cathodic Protection of DH36 Steel in Seawater. Journal of Chinese Society for Corrosion and protection, 2014, 34(6): 550-557.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.183 或 https://www.jcscp.org/CN/Y2014/V34/I6/550

图1 实验装置示意图

图2 三电极实验单元示意图

图3 不同流速和不同电流密度下电位随时间的变化曲线

表1 不同流速和不同电流密度条件下阴极极化7 d后的电极电位值

图4 试片在不同流速和不同电流密度条件下极化7 d后的表面宏观形貌

图5 流速为0.20 m/s时不同电流密度下沉积层的SEM像

图6 800 mA/m2条件下试片表面的EDX结果

表2 流速为0.20 m/s时不同电流密度条件下沉积层中各元素的含量

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