静态和动态海水中B10铜镍合金管的腐蚀行为研究

doi:10.11902/1005.4537.2022.024

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 119-126 CSTR: 32134.14.1005.4537.2022.024 DOI: 10.11902/1005.4537.2022.024

研究报告

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静态和动态海水中B10铜镍合金管的腐蚀行为研究

王晓¹, 刘峰², 李焰¹(

), 张威³, 李相波²

^1.中国石油大学 (华东) 材料科学与工程学院青岛 266580
^2.中国船舶重工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
^3.武汉理工大学材料复合新技术国家重点实验室武汉 430070

Corrosion Behavior of B10 Cu-Ni Alloy Pipe in Static and Dynamic Seawater

WANG Xiao¹, LIU Feng², LI Yan¹(

), ZHANG Wei³, LI Xiangbo²

^1.School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China
^2.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China
^3.State Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

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摘要:

采用可原位测量的管流式试验装置，利用失重和电化学阻抗谱测试对比研究了B10管在静态和动态天然海水中的腐蚀行为及其随时间的变化，并通过SEM、XPS等分析了其腐蚀形貌及腐蚀产物。结果表明，在两种海水暴露条件下，试样的腐蚀速率随时间的延长逐渐降低。B10管表面在静态下生成的腐蚀产物主要是Cu₂O，而在动态条件下则为NiO、Cu₂O和FeOOH，其中NiO和FeOOH的存在降低了腐蚀速率，提高了B10管的耐蚀性。本文研究表明冲刷状态有利于B10管表面形成更为致密的腐蚀产物膜，对基体起到良好的保护作用。研究结果可为海水管路动态条件下B10管成膜质量和服役性能评价提供实验依据。

关键词 ： B10铜镍合金管, 冲刷腐蚀, 原位电化学测试, 腐蚀产物膜

Abstract：

The corrosion behavior of B10 Cu-Ni alloy in static and dynamic seawater was studied by using a loop test device with in-situ measurement accessory. The corrosion rate, electrochemical characteristics, corrosion morphology and corrosion products of B10 alloy were characterized by means of mass loss method, electrochemical impedance spectroscope (EIS), scanning electron microscope (SEM) and X-ray photoelectron spectroscope (XPS). The results show that the corrosion rate of the alloy in static and dynamic seawater gradually decreased with time, while the formed corrosion product film was compact. The products generated on the B10 alloy in static seawater composed mainly of Cu₂O, but NiO, Cu₂O and FeOOH for that in flowing seawater. It is noted that the presence of NiO and FeOOH may be beneficial to the reduction of corrosion reaction rate and the enhancement of corrosion resistance of B10 alloy. In other word, the seawater erosion may facilitate the formation of the compact corrosion product film to protect the substrate. The study can provide an experimental basis for the evaluation of the quality corrosion product film on B10 alloy and the service performance of B10 alloy served as pipeline in dynamic seawaters.

Key words： 90/10 copper-nickel pipe erosion-corrosion real-time electrochemical testing corrosion product film

收稿日期: 2022-01-20 32134.14.1005.4537.2022.024

ZTFLH:

TG174

作者简介: 王晓，女，1997年生，硕士生

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引用本文:

王晓, 刘峰, 李焰, 张威, 李相波. 静态和动态海水中B10铜镍合金管的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2023, 43(1): 119-126.
Xiao WANG, Feng LIU, Yan LI, Wei ZHANG, Xiangbo LI. Corrosion Behavior of B10 Cu-Ni Alloy Pipe in Static and Dynamic Seawater. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 119-126.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.024 或 https://www.jcscp.org/CN/Y2023/V43/I1/119

图1 B10管静态和动态腐蚀不同时间的SEM形貌

图2 B10管静态和动态腐蚀60 d的XPS全谱图

图3 B10管静态和动态腐蚀60 d的元素百分比

图4 B10管静态和动态腐蚀60 d的XPS谱

图5 静态条件下B10管的电化学阻抗图

图6 动态条件下B10管的电化学阻抗图

图7 B10管在海水中的等效电路图

表1 B10管在静态和动态下的EIS拟合数据

图8 B10管在海水中的Rct和Rf随时间变化曲线

图9 B10管浸泡和冲刷腐蚀7 d后海水冲刷1 d的开路电位及电化学阻抗图

图10 B10管随时间变化的开路电位

图11 B10管随时间变化的腐蚀速率

图12 B10管静态和动态腐蚀机理示意图

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