海水流速对B10/B30电偶腐蚀行为影响规律研究

doi:10.11902/1005.4537.2022.109

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 391-398 CSTR: 32134.14.1005.4537.2022.109 DOI: 10.11902/1005.4537.2022.109

研究报告

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海水流速对B10/B30电偶腐蚀行为影响规律研究

邢少华¹(

), 刘近增¹^,², 白舒宇¹, 钱峣¹^,², 张大磊², 马力¹

^1.中国船舶集团公司第七二五研究所海洋腐蚀与防护重点实验室青岛 266237
^2.中国石油大学 (华东) 材料科学与工程学院青岛 266580

Influence of Seawater Flow Speed on Galvanic Corrosion Behavior of B10/B30 Alloys Coupling

XING Shaohua¹(

), LIU Jinzeng¹^,², BAI Shuyu¹, QIAN Yao¹^,², ZHANG Dalei², MA Li¹

^1.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China
^2.School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China

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摘要:

B10和B30铜镍合金分别为船舶海水管路和冷却器的主要材料，二者由于镍含量不同腐蚀电位不同，管路与冷却设备连接后，B10和B30存在电偶腐蚀风险，特别是在流动海水加速腐蚀介质和腐蚀产物扩散工况条件。为控制B10/B30电偶腐蚀以延长海水管路系统使用寿命，本文通过电化学法测试了B10和B30管状偶对在静态以及1、3和5 m/s流速海水中的电偶电位和电偶电流，分析电偶腐蚀速率随时间和流速的变化规律。研究结果表明：在静态海水中，B10与B30的电偶腐蚀倾向较小，试验初期B10作为阳极腐蚀略有增加，实验40 h后电偶电流趋近于零；流动海水中，B10阳极极化电流密度和B30阴极极化电流密度显著增加，B10始终作为阳极电偶腐蚀显著加剧，1 m/s流速下的电偶腐蚀速率是静态下的79倍，且随着海水流速的增大，B10/B30电偶电流密度增大，电偶腐蚀速率加快，混合电位理论分析表明B10/B30电偶腐蚀速率是由B10阳极反应动力学和B30阴极反应动力学共同控制。

关键词 ：海水管路系统, 铜镍合金, 流动海水, 电偶腐蚀

Abstract：

Copper-nickel alloys B10 and B30 are the main materials of marine seawater piping and coolers respectively. The two alloys have different corrosion potential due to the different nickel content, and thus there is a risk of galvanic corrosion for the couple of B10 and B30 when the pipes are connected to the cooling equipment. Especially in the working conditions of flowing seawater, the diffusion of corrosive media and corrosion products may be aggravated. In order to control the corrosion of the galvanic couple B10/B30 and prolong the service life of seawater pipeline, in this paper, the galvanic potential and galvanic current of the couple B10 and B30 in static and flowing seawater (1, 3 and 5 m/s) are monitored in situ, to acquire the variation of the galvanic corrosion rate with time and flow rate. The results show that, in static seawater, the galvanic corrosion tendency of the couple B10/B30 is small, and the corrosion rate of B10 as the anode slightly increases at the beginning of the experiment, while after 40 h test, the galvanic current approaches zero. In flowing seawater, the anodic polarization current density of B10 and the cathodic polarization current density of B30 increases significantly, B10 always acts as anode and the galvanic corrosion is significantly intensified, the galvanic corrosion rate at flow speed 1 m/s is 79 times that in static seawater. As the flow speed of seawater increases, the current density of the couple B10/B30 increases and the corrosion rate of the couples accelerates. The galvanic corrosion rate of the couple B10/B30 is controlled by both the B10 anodic reaction and the B30 cathodic reaction according to mix potential analysis.

Key words： seawater pipeline copper nickel alloy flowing seawater galvanic corrosion

收稿日期: 2022-04-14 32134.14.1005.4537.2022.109

ZTFLH:

TG174

作者简介: 邢少华，男，1981年生，博士，高级工程师

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引用本文:

邢少华, 刘近增, 白舒宇, 钱峣, 张大磊, 马力. 海水流速对B10/B30电偶腐蚀行为影响规律研究[J]. 中国腐蚀与防护学报, 2023, 43(2): 391-398.
Shaohua XING, Jinzeng LIU, Shuyu BAI, Yao QIAN, Dalei ZHANG, Li MA. Influence of Seawater Flow Speed on Galvanic Corrosion Behavior of B10/B30 Alloys Coupling. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 391-398.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.109 或 https://www.jcscp.org/CN/Y2023/V43/I2/391

图1 B10和B30试样在不同流速海水中的腐蚀电位

图2 B10/B30偶对电偶电位随时间变化曲线

图3 B10/B30偶对在不同流速海水中电偶电流密度随时间变化曲线

图4 电偶电流密度和电偶电位随流速变化曲线

图5 B10/ B30偶对在不同流速海水的腐蚀形貌

图6 B10电偶腐蚀产物微观形貌图

表1 偶接B10腐蚀产物元素组成 (mass fraction / %)

图7 不同流速海水中偶接B10去除腐蚀产物后表面微观形貌图

图8 B10/B30偶对不同流速海水中电偶腐蚀动力学分析

图9 B10/B30偶对在静态海水中的电偶腐蚀机理图

图10 B10/B30偶对在流动海水中的电偶腐蚀机理图

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