Comparative Study on Corrosion Behavior of 7B04 Aluminum Alloy Riveted Structure under Different Sea Areas
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摘要: 在两种不同海域的海洋环境下对7B04铝合金铆接结构试验件进行自然曝晒，通过对试验件一年后腐蚀情况的对比分析，研究了这两种海洋服役环境对7B04铝合金的腐蚀影响。结果表明：两种海域的海洋环境对7B04铝合金铆接结构试验件都产生了明显的腐蚀行为，疲劳性能均有不同程度的下降，涂层对海洋环境能够起到较好的防护作用；同时两种海洋环境对7B04铝合金腐蚀行为的影响也表现出明显的差异性，必须对更严酷的服役环境做好针对性的腐蚀防护工作。Abstract: 7B04 aluminum alloy riveted structure specimens were exposured in two different marine environments for one year. The corrosion of the specimens was comparatively analyzed, and the effect of the two service environments on the corrosion behavior of 7B04 aluminum alloy was studied. The results show that the corrosion of 7B04 aluminum alloy riveted structure specimens has occurred obviously in the two marine environments, the fatigue performance of specimens has been reduced with varying degree. But coatings can protect the aluminum alloy away from destruction in marine environment. The effect of the two marine environments on the corrosion behavior of 7B04 aluminum alloy also shows obvious difference, the corrosion protection must be done well in service environment.
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Key words:
- aluminum alloy /
- corrosion behavior /
- fatigue property
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表 1 试验件数量及分类
试验件编号 试件类型 试验环境 类别名称 L-1~L-5 裸件 舰艇服役海域 L1类试件 M-1~M-5 涂层 舰艇服役海域 M1类验件 L-6~L-10 裸件 小麦岛 L2类试件 M-6~M-10 涂层 小麦岛 M2类试件 L-11~L-15 裸件 无 L3类试件 
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表 2 L1与L2类试验件腐蚀情况统计
试验环境 小麦岛 舰艇服役海域 平均腐蚀坑数目/个 1.5 3.2 平均腐蚀坑深度/μm 14.799 17.452 平均腐蚀坑宽度/μm 6.918 8.336
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表 3 L3类试验件疲劳寿命
试件编号 最大应力/MPa 疲劳寿命/次 寿命均值/次 L-11 91.32 137255 188541 L-12 85.54 215468 L-13 106.27 98542 L-14 85.54 294571 L-15 102.32 196873
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表 4 试验件疲劳寿命
试件分类 试件编号 疲劳寿命/次 平均寿命/次 L1 L-1 6182 4660 L-2 5423 L-3 7292 L-4 2811 L-5 1592 L2 L-6 35627 63100 L-7 66945 L-8 100226 L-9 46810 L-10 65894 M1 M-1 13284 11677 M-2 22314 M-3 9652 M-4 4574 M-5 8562 M2 M-6 84251 71844 M-7 58941 M-8 94851 M-9 65339 M-10 55842
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