7050铝合金板材晶粒结构与抗剥落腐蚀性能的关系

doi:10.11902/1005.4537.2014.219

中国腐蚀与防护学报

2015, Vol. 35

Issue (5): 423-428 DOI: 10.11902/1005.4537.2014.219

本期目录 | 过刊浏览

7050铝合金板材晶粒结构与抗剥落腐蚀性能的关系

赵凤^1,²(

),鲁法云^1,²,穆楠^1,²,郭富安^1,²,张莉¹

2. 北京南山航空材料研究院北京 100048

Relations between Microstructure and Exfoliation Corrosion Resistance of 7050 Al-alloy

Feng ZHAO^1,²(

),Fayun LU^1,²,Nan MU^1,²,Fuan GUO^1,²,Li ZHANG¹

1. National Engineering Research Center for Plastic Working of Aluminium Alloys, Shandong Nanshan Aluminium Co., Ltd., Yantai 265713, China
2. Beijing Nanshan Institute of Aeronautical Materials, Beijing 100048, China

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摘要:

利用金相显微镜、扫描电镜及图像分析软件,分析7050-T7451合金的微观组织特征、剥蚀过程中的扩展路径和腐蚀深度,研究了样品的晶界析出相的分布、再结晶比例和晶粒长宽比对抗剥落腐蚀性能的影响程度。结果表明：对不同加工工艺的7050-T7451合金板材,晶界析出相均呈断续分布,晶粒组织主要由再结晶晶粒和未再结晶晶粒组成,但是平均晶粒长宽比、再结晶比例以及晶界析出相断续程度存在差异；在晶界析出相断续分布时,平均晶粒长宽比对该板材的剥蚀行为和剥蚀深度起到主导作用,晶界析出相的断续程度以及再结晶比例对剥落腐蚀程度影响较小；当平均晶粒长宽比小于5,晶界析出相断续分布时,抗剥落腐蚀性能级别可以达到EA级及以上。

关键词 ： 7050-T7451铝合金, 剥落腐蚀, 晶粒长宽比, 晶界析出相

Abstract：

The microstructure characteristics, exfoliation corrosion behavior of 7050-T7451Al- alloy plates were examined by optical microscopy, scanning electron microscopy and Image Pro Plus. The effect of the distribution of grain boundary precipitates, the fraction of recrystallized grains and the length-width ratio of grains on the exfoliation corrosion behavior was investigated. The results indicate that the microstructures of the 7050-T7451 plates fabricated by different processes are composed of recrystallized grains and non-recrystallized grains with precipitates distributed discontinuously along grain boundaries; but which varied corresponding to the relevant fabrication processes. The average length-width ratio of grains plays an important role in the exfoliation corrosion process of the plate, while the influence of the discontinuity of precipitates distribution and the fraction of recrystallized grains is weak. When the precipitates distribute discontinuously along grain boundaries and the average length-width ratio of grains is less than 5, the EXCO resistance of 7050-T7451 plate can reach EA degree or better.

Key words： 7050-T7451 aluminum alloy exfoliation corrosion grain aspect ratio grain boundary precipitate

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引用本文:

赵凤, 鲁法云, 穆楠, 郭富安, 张莉. 7050铝合金板材晶粒结构与抗剥落腐蚀性能的关系[J]. 中国腐蚀与防护学报, 2015, 35(5): 423-428.
Feng ZHAO, Fayun LU, Nan MU, Fuan GUO, Li ZHANG. Relations between Microstructure and Exfoliation Corrosion Resistance of 7050 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 423-428.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.219 或 https://www.jcscp.org/CN/Y2015/V35/I5/423

图1 实验样品的晶界析出相形貌

图2 金相显微镜明场下样品的晶粒形貌

图3 阳极覆膜后晶粒形貌和晶粒长宽比的统计图

图4 剥落腐蚀实验48 h后的样品形貌及剥落物

图5 剥落腐蚀实验后样品纵截面晶粒形貌观察

图6 剥落腐蚀实验后样品纵截面腐蚀深度观察

图7 2014合金表层、1/4层、芯部的平均晶粒尺寸及其对剥落腐蚀深度的影响[11]

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