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海洋环境下三电极的电偶腐蚀仿真

陈跃良 王安东 卞贵学 张勇

陈跃良, 王安东, 卞贵学, 等 . 海洋环境下三电极的电偶腐蚀仿真[J]. 北京航空航天大学学报, 2018, 44(9): 1808-1817. doi: 10.13700/j.bh.1001-5965.2017.0670
引用本文: 陈跃良, 王安东, 卞贵学, 等 . 海洋环境下三电极的电偶腐蚀仿真[J]. 北京航空航天大学学报, 2018, 44(9): 1808-1817. doi: 10.13700/j.bh.1001-5965.2017.0670
CHEN Yueliang, WANG Andong, BIAN Guixue, et al. Simulation of galvanic corrosion of three electrodes in marine environment[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(9): 1808-1817. doi: 10.13700/j.bh.1001-5965.2017.0670(in Chinese)
Citation: CHEN Yueliang, WANG Andong, BIAN Guixue, et al. Simulation of galvanic corrosion of three electrodes in marine environment[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(9): 1808-1817. doi: 10.13700/j.bh.1001-5965.2017.0670(in Chinese)

海洋环境下三电极的电偶腐蚀仿真

doi: 10.13700/j.bh.1001-5965.2017.0670
基金项目: 

国家自然科学基金 51075394

详细信息
    作者简介:

    陈跃良  男, 博士, 教授, 博士生导师。主要研究方向:飞机结构强度、结构腐蚀与防护

    王安东  男, 博士研究生。主要研究方向:飞机结构强度、结构腐蚀防护与控制

    通讯作者:

    陈跃良, E-mail:cyl0532@sina.com

  • 中图分类号: V252.2

Simulation of galvanic corrosion of three electrodes in marine environment

Funds: 

National Natural Science Foundation of China 51075394

More Information
  • 摘要:

    为研究三电极的电偶腐蚀行为,测量了CF8611/AC531复合材料(CFRP)、7B04-T74铝合金(7B04)和镀锌30CrMnSiA钢(GSB)的极化曲线;开展了搭接件在模拟海洋环境下的全浸试验;设计了圆形三电极,推导了稳态腐蚀场和参数化扫描方程,建立了三电极和搭接件的电偶腐蚀模型。结果表明:稳态腐蚀场中的电势分布符合Laplace方程;电位最高的CFRP为阴极,最低的GSB为阳极,中间的7B04阴/阳极角色会随某一电极面积变化而转变,给出了转变的临界面积比,各电极表面电偶电流服从指数分布,相关系数近于1,拟合精度高;在搭接件中,搭接区电位和电流密度最高,并向两端对称递减,7B04和GSB均为阳极,电流密度分别提高约210倍和328倍,电偶腐蚀效应显著;搭接区7B04板全面腐蚀,厚度损失约1.011%;仿真所得点蚀敏感区宽度范围为3.9~7.6mm,实测所得宽度范围为4.667~8.872mm,二者范围、形状及变化规律吻合较好,表明模型有效、可靠。

     

  • 图 1  搭接件形状及尺寸

    Figure 1.  Shape and dimension of lap joint

    图 2  圆形三电极

    Figure 2.  Circular three electrodes

    图 3  极化曲线

    Figure 3.  Polarization curves

    图 4  搭接件表面区域划分

    Figure 4.  Surface division of lap joint

    图 5  三电极电偶腐蚀中的电流密度矢量

    Figure 5.  Current density vector in galvanic corrosion of three electrodes

    图 6  三电极中各电极表面的电偶电流

    Figure 6.  Galvanic current of each electrode surface in three electrodes

    图 7  搭接件表面的电位分布

    Figure 7.  Potential distribution on surface of lap joint

    图 8  搭接件表面的电流密度分布

    Figure 8.  Current density distribution on surface of lap joint

    图 9  搭接件中7B04板表面的电位分布

    Figure 9.  Potential distribution on surface of 7B04 plates in lap joint

    图 10  六角头螺栓的腐蚀路径

    Figure 10.  Corrosion pathway of six-corner bolt

    图 11  全浸腐蚀后搭接件中7B04板表面的腐蚀形貌

    Figure 11.  Surface corrosion morphology of 7B04 plates in lap joint after full immersion corrosion

    图 12  7B04板表面点蚀敏感区向搭接区过渡位置腐蚀形貌

    Figure 12.  Corrosion morphology of transition zone from pitting sensitive area to overlap zone on surface of 7B04 plates

    表  1  电偶电流指数分布的参数拟合值

    Table  1.   Fitted values of exponential distribution parameters of galvanic current

    m k t RSquare
    -386.2 386.0 3965 0.99993
    1.274 -3.636 116.2 0.99883
    -572.2 574.4 -7019 0.99995
    -1.244 -0.065 89.52 0.94747
    -8.613 8.166 77.88 0.98532
    10.30 -8.392 93.12 0.97821
    -1.314 0.147 3.149 0.96872
    -3.171 3.965 9.886 0.97230
    4.465 -4.109 8.988 0.94415
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-10-30
  • 录用日期:  2017-12-04
  • 刊出日期:  2018-09-20

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