大变形2519A铝合金局部腐蚀行为研究
毕业论文关键词 2519A 铝合金 ECAP 塑性变形 局部腐蚀 时效
Title Study on localized corrosion of severe plastic deformed 2519A aluminum alloy
Abstract
To explore the localized corrosion potential of age-hardening aluminum
alloy subjected to severe plastic deformation, we choose aluminum alloy
2519A as object. By optical microscope and scanning electron microscope
the properties of localized corrosion on 2519A aluminum alloy after plastic
deformation by ECAP after one-pass and aging were studied by immersion test
and Tafel test. The results show that intergranular corrosion depths for
samples after one pass ECAPed were sharply decreased compared to samples
after solid solution treatment，but exfoliation corrosion resistance shows
the opposite tendency. As time gose on, the intergranular corrosion
propagation depths was found raised at first, then decreased, form
85.2μ m to 288.0μ m than decrease to 213.5μ m, but diametrically opposite
condition was found in the exfoliation corrosion in the 2519A aluminum
alloy aged at 180℃. As the aging temperature increases, the influence of
intergranular corrosion was decreased, but the exfoliation corrosion just the opposite.
Keywords 2519A aluminum ally ECAP localized corrosion aging
目 录 ..I
1 引言 .1
1.1 等通道转角挤压技术概述 .1
1.2 铝合金腐蚀 .3
1.2.1 铝合金晶间腐蚀 4
1.2.1.1 铝合金晶间腐蚀理论 ..4
1.2.1.2 铝合金晶间腐蚀影响因素 5
1.2.2 铝合金剥落腐蚀 6
1.2.2.1 铝合金剥落腐蚀理论 ..6
1.2.2.2 铝合金剥落腐蚀影响因素 6
1.3 本课题研究的意义 8
2 实验 .8
2.1 实验材料 ..8
2.2 实验仪器 ..8
2.3 样品制备及实验方法 9
2.3.1 实验流程 9
2.3.2 样品制备 9
2.3.3 实验方法 10
2.3.3.1 TAFEL 极化曲线测试 .. 10
2.2.3.2 晶间腐蚀 . 10
2.3.3.1 剥落腐蚀 . 10
3 实验结果 .. 10
3.1 Tafel极化曲线 11
3.2 晶间腐蚀 .. 11
3.3 剥落腐蚀 .. 13 4 . 18
4.1 ECAP大塑性变形对铝合金腐蚀性能的影响 .. 18
4.2. 热处理制度对铝合金腐蚀性能的影响 19
结 论 22
致 谢 23
参 考 文 献 .. 24
1 引言
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