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全浸腐蚀条件下${\rm{NO}}_3^-$对2A12-T4铝合金剥蚀的影响

张胜 何宇廷 倪波 许大伟 阎勇 崔常京

张胜,何宇廷,倪波,等. 全浸腐蚀条件下\scriptsize${{NO}}_{\textit{3}}^-$对2A12-T4铝合金剥蚀的影响[J]. 北京航空航天大学学报,2023,49(6):1372-1382 doi: 10.13700/j.bh.1001-5965.2021.0473
引用本文: 张胜,何宇廷,倪波,等. 全浸腐蚀条件下\scriptsize${{NO}}_{\textit{3}}^-$对2A12-T4铝合金剥蚀的影响[J]. 北京航空航天大学学报,2023,49(6):1372-1382 doi: 10.13700/j.bh.1001-5965.2021.0473
ZHANG S,HE Y T,NI B,et al. Effect of nitrate on exfoliation corrosion of 2A12-T4 aluminum alloy under full-immersion corrosion condition[J]. Journal of Beijing University of Aeronautics and Astronautics,2023,49(6):1372-1382 (in Chinese) doi: 10.13700/j.bh.1001-5965.2021.0473
Citation: ZHANG S,HE Y T,NI B,et al. Effect of nitrate on exfoliation corrosion of 2A12-T4 aluminum alloy under full-immersion corrosion condition[J]. Journal of Beijing University of Aeronautics and Astronautics,2023,49(6):1372-1382 (in Chinese) doi: 10.13700/j.bh.1001-5965.2021.0473

全浸腐蚀条件下${\rm{NO}}_3^-$对2A12-T4铝合金剥蚀的影响

doi: 10.13700/j.bh.1001-5965.2021.0473
基金项目: 陕西省自然科学基础研究计划(2018JQ5012)
详细信息
    通讯作者:

    E-mail:heyut666@126.com

  • 中图分类号: V252.2;TG172

Effect of nitrate on exfoliation corrosion of 2A12-T4 aluminum alloy under full-immersion corrosion condition

Funds: Shaanxi Provincial Natural Science Basic Research Program (2018JQ5012)
More Information
  • 摘要:

    针对沿海暴露20年的2A12-T4铝合金试验件,采用球差校正透射电镜,在剥蚀区域纵截面腐蚀最深处的腐蚀产物中,首次测到了N元素的存在,说明铝合金沿海大气剥蚀过程中存在${\text{NO}}_x^{{ - }}$。开展2A12-T4铝合金在4种不同${\text{NO}}_3^{{ - }}$浓度腐蚀溶液中的全浸腐蚀试验,发现随着溶液中${\text{NO}}_3^{{ - }}$浓度降低,试验件的剥蚀严重程度明显减弱,且在含有${\text{Cl}}_{}^{{ - }}$和${\text{SO}}_4^{{{2 - }}}$,而不含${\text{NO}}_3^{{ - }}$的溶液中,试验件未能发生剥蚀。结合对产生气体的测试和离子色谱仪分析,表面和截面腐蚀行为扫描电子显微镜(SEM)、能谱仪(EDS)分析等,讨论${\text{NO}}_3^{{ - }}$对铝合金剥蚀的影响机理。建议在开展飞机铝合金结构沿海大气剥蚀模拟试验时,不能忽视腐蚀环境中${\text{NO}}_3^{{ - }}$的作用。

     

  • 图 1  试验件的形状和尺寸

    Figure 1.  Geometry and dimensions of specimens

    图 2  暴露20年后试验件剥蚀区域纵截面(S-L)的晶间腐蚀形貌和腐蚀产物EDS分析

    Figure 2.  S-L sectional SEM morphology and results of EDS of products of intergranular corrosion inside exfoliation corrosion area of 2A12-T4 aluminum alloy exposed for 20 years

    图 3  试验件分别在1#、2#、3#、4#溶液中腐蚀192 h后的宏观表面腐蚀形貌(1-8#为对照组)

    Figure 3.  Macroscopic surface corrosion morphology of specimens after 192 h corrosion in 1#, 2#, 3# and 4# solutions (1-8# is control group)

    图 4  试验件分别在1#、2#、3#、4#溶液中腐蚀192 h后的微观表面腐蚀形貌

    Figure 4.  Micro surface corrosion morphology of specimens after corrosion in 1#, 2#, 3#, 4# solution for 192 h

    图 5  不同试验件的纵截面(S-L)腐蚀形貌

    Figure 5.  Microscopic corrosion morphologies of S-L sections of different specimens

    图 6  腐蚀192 h后1#溶液的离子色谱分析结果

    Figure 6.  Results of ion chromatographic analysis of solution 1# after 192 h corrosion

    图 7  纵截面(S-L)腐蚀形貌和能谱分析结果(腐蚀5 h)

    Figure 7.  Corrosion morphology and EDS results of longitudinal S-L sections (corrosion for 5 h)

    图 8  近似平行于L向的连续晶界发生严重晶间腐蚀的过程示意图

    Figure 8.  Schematic diagram of process of severe intergranular corrosion occurring at the continuous grain boundary approximately parallel to L direction

    图 9  2-8#试验件的纵截面(S-L)腐蚀形貌

    Figure 9.  Corrosion morphology of longitudinal S-L section of 2-8# specimen

    表  1  2类试验件2A12-T4铝合金材料的化学成分

    Table  1.   Chemical composition of two types of specimens (2A12-T4 aluminum alloy) %

    类型化学成分的质量分数
    SiFeCuMnMgNiZnTiAl
    大气
    暴露
    0.100.224.620.541.600.990.220.13余量
    实验室腐蚀0.400.354.300.701.400.080.200.13余量
    下载: 导出CSV

    表  2  万宁市自然环境试验站大气环境数据

    Table  2.   Environmental data of Wanning test site

    环境参数年平均值
    温度/°C23.9
    相对湿度/%87.6
    降水量/mm198.156
    风速/(m·s−12.431
    SO2/(mg·m−30.045275
    NO2/(mg·m−30.002025
    Cl 沉积速率/(mg·(dm2·d)−114.5875
    降雨pH5.125
    下载: 导出CSV

    表  3  不同腐蚀溶液腐蚀介质成分及浓度

    Table  3.   Components and concentrations of corrosion media in different corrosion solutions

    腐蚀溶液编号腐蚀介质成分浓度/ (mol·L−1)PH
    1#(EXCO溶液)NaCl4.000.4
    KNO30.50
    HNO30.10
    2#NaCl4.000.4
    K2SO40.25
    H2SO40.05
    3#NaCl4.000.4
    K2SO40.25
    HNO30.10
    4#NaCl4.000.4
    KNO30.50
    H2SO40.05
    下载: 导出CSV

    表  4  试验件编号示例

    Table  4.   Example of specimen number

    腐蚀
    时间/h
    试验件编号
    1#
    (EXCO溶液)
    2#
    (EXCO溶液)
    3#
    (EXCO溶液)
    4#
    (EXCO溶液)
    51-1#2-1#3-1#4-1#
    241-2#2-2#3-2#4-2#
    481-3#2-3#3-3#4-3#
    961-4#2-4#3-4#4-4#
    1201-5#2-5#3-5#4-5#
    1441-6#2-6#3-6#4-6#
    1681-7#2-7#3-7#4-7#
    1921-8#2-8#3-8#4-8#
    下载: 导出CSV

    表  5  2-8#试验件的纵截面(S-L)EDS数据

    Table  5.   EDS results of longitudinal S-L section of 2-8# specimen %

    化学成分质量分数
    ONaMgAlSClKCu
    120.341.0868.5510.03
    224.451.8264.449.30
    317.291.4961.8619.36
    429.671.2159.709.42
    533.840.950.9258.571.820.373.53
    647.751.0345.362.453.41
    740.881.070.6251.661.600.610.413.14
    845.100.8747.942.170.670.322.93
    960.4632.093.080.663.71
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-19
  • 录用日期:  2021-10-15
  • 网络出版日期:  2021-12-13
  • 整期出版日期:  2023-06-30

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