钛合金和铜合金管路电偶腐蚀数值仿真

doi:10.11902/1005.4537.2017.113

中国腐蚀与防护学报

2018, Vol. 38

Issue (4): 403-408 DOI: 10.11902/1005.4537.2017.113

研究报告

本期目录 | 过刊浏览

钛合金和铜合金管路电偶腐蚀数值仿真

王振华¹(

), 白杨^1,², 马晓¹, 邢少华¹

1 海洋腐蚀与防护重点实验室中船重工七二五所青岛 266101
2 中国石油大学 (华东) 机电工程学院青岛 266580

Numerical Simulation of Galvanic Corrosion for Couple of Ti-alloy with Cu-alloy in Seawaters

Zhenhua WANG¹(

), Yang BAI^1,², Xiao MA¹, Shaohua XING¹

1 State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute,Qingdao 266101, China
2 College of Mechanical and Electrical Engineering, University of China Petroleum (East China), Qingdao 266580, China

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摘要:

针对典型船舶海水管路模型,采用以边界元法为基础的数值模拟仿真技术,对TA2钛合金和B10铜合金两种金属材料海水管路模型进行电偶腐蚀数值仿真。通过动电位极化曲线测试法分别测量B10铜镍合金、TA2钛合金在静态以及流态下的极化曲线,以其作为模拟边界条件,分别研究了材料间电偶腐蚀电位和电流密度的分布规律。同时研究了不同管径和海水流速工况下的管路电偶腐蚀规律。结果表明,在TA2和B10组成的电偶体系 (面积比1∶1) 中,B10作为阳极材料,且电连接处腐蚀最严重,约为自然腐蚀的4倍;电偶腐蚀速率与管径与介质流速都呈正相关关系。

关键词 ：钛合金, 铜合金, 海水管路, 电偶腐蚀, 数值仿真

Abstract：

The galvanic corrosion for the couple of TA2 Ti-alloy and Cu-Ni alloy, which was adopted typically for seawater pipeline of ship, was numerically simulated by means of the numerical simulation technique based on the boundary element method. In the meanwhile, the measured potentiodynamic polarization curves of Ti-alloy and Cu-alloy in static and flow seawater are used as reference as the boundary conditions for the numerical simulation. The following items are mainly concerned in the numerical simulation, namely the distributions of galvanic corrosion potential and the galvanic corrosion current density corresponding to the given parameters such as varying pipe radius, medium velocity and insulation grade etc. The results showed that the most severe corrosion area emerged in the place, where the two electrodes directly connected for the couple system of TA2 and B10 (area ratio 1:1), with a corrosion severity of about 4 times of that appeared in the case of natural corrosion. The galvanic corrosion rate shows a positive correlation with the pipe diameter and the media velocity.

Key words： Ti-alloy Cu-alloy seawater piping galvanic corrosion numerical simulation

收稿日期: 2017-07-13

ZTFLH:

TG174.461

作者简介:

作者简介王振华,男,1988年生,工程师

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引用本文:

王振华, 白杨, 马晓, 邢少华. 钛合金和铜合金管路电偶腐蚀数值仿真[J]. 中国腐蚀与防护学报, 2018, 38(4): 403-408.
Zhenhua WANG, Yang BAI, Xiao MA, Shaohua XING. Numerical Simulation of Galvanic Corrosion for Couple of Ti-alloy with Cu-alloy in Seawaters. Journal of Chinese Society for Corrosion and protection, 2018, 38(4): 403-408.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.113 或 https://www.jcscp.org/CN/Y2018/V38/I4/403

表1 B10铜镍合金和TA2钛合金的化学组成

图1 流道式动态介质电化学测试装置原理图

图2 腐蚀体系微元

图3 管-管式有限元模型尺寸模型和网格划分模型

图4 不同工况下B10合金和TA2钛合金的极化曲线

表2 B10铜镍合金和TA2钛合金的电化学参数

图5 海水管路偶合电位分布图

图6 电偶腐蚀过程中电化学参数随管路轴向的变化曲线

图7 电偶腐蚀过程中电化学参数随纵管路管径的变化曲线

图8 不同流速下海水管路模拟电位分布图

图9 静态/动态海水条件下电流密度随距离变化曲线

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