腐蚀与交变载荷循环作用对2A12-T4铝合金疲劳寿命的影响

doi:10.11902/1005.4537.2013.255

中国腐蚀与防护学报

2015, Vol. 35

Issue (1): 61-68 DOI: 10.11902/1005.4537.2013.255

本期目录 | 过刊浏览

腐蚀与交变载荷循环作用对2A12-T4铝合金疲劳寿命的影响

蔡剑¹, 刘道新¹(

), 叶作彦¹, 张晓化¹, 何宇廷², 崔腾飞¹

1. 西北工业大学航空学院西安 710072
2. 空军工程大学航空航天工程学院西安 710038

Influence of Cyclic Action of Corrosion and Alternate Load on Fatigue Life of 2A12-T4 Aluminum Alloy

CAI Jian¹, LIU Daoxin¹(

), YE Zuoyan¹, ZHANG Xiaohua¹, HE Yuting², CUI Tengfei¹

1. School of Aeronautics, Northwestern Polytechnic University, Xi'an 710072, China
2. School of Aeronautics and Astronautics Engineering, Air Force Engineering University, Xi'an 710038, China

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摘要:

对2A12-T4典型航空铝合金进行了腐蚀与疲劳交替循环实验,研究了腐蚀与疲劳加载交替循环频次、腐蚀方式 (周期浸润腐蚀、盐雾腐蚀、盐雾腐蚀+湿热腐蚀) 对2A12-T4铝合金疲劳性能退化规律的影响和作用机制。结果表明：在腐蚀总时间相同的条件下,腐蚀与疲劳交替循环频次对铝合金疲劳寿命有重要影响,随着交替频次的增加,铝合金疲劳寿命逐渐增大,循环交替2,4和6次的铝合金试样的疲劳寿命比交替1次试样的疲劳寿命分别增大16.9%,30.7%和50.3%。腐蚀方式对铝合金疲劳寿命也有重要的影响,对铝合金疲劳寿命影响程度从大到小的腐蚀方式排序为：盐雾腐蚀>周期浸润腐蚀>盐雾与湿热循环腐蚀。上述影响规律与腐蚀因素所起权重大小及内在机制密切相关。

关键词 ： 2A12-T4铝合金, 腐蚀, 疲劳, 腐蚀介质与交变载荷循环作用, 腐蚀方式

Abstract：

Tests of alternate corrosion and fatigue for 2A12-T4 aluminum alloy were performed in order to reveal the influence of factors related with corrosion environment and load on its fatigue life. The effect of the alternate frequency of corrosion/fatigue and the type of corrosion tests such as alternate immersion, salt spray and salt spray+hot and humidity corrosion on the degradation of 2A12-T4 aluminum alloy was analyzed. The results show that for a designated total time of corrosion, the alternate frequency of corrosion/fatigue has important influence on the fatigue life of the alloy. The fatigue life of the alloy increases gradually with the increasing alternate frequency. The total fatigue life of aluminum alloy for 2, 4 and 6 cycles were 16.9%, 30.7% and 50.3% respectively higher than that for the first cycle. Besides, the type of corrosion tests also has important influence on the fatigue life of the alloy, of which the impact intensity may be ranked in a descending order as follows: salt spray corrosion>alternate immersion corrosion>salt spray+hot and humidity corrosion.

Key words： 2A12-T4 aluminum alloy corrosion fatigue the alternate action of environment medium and stress corrosion type

ZTFLH:

TG172.9

基金资助:国家自然科学基金项目(51171154) 资助

作者简介: null

蔡剑，男，1989年生，硕士生

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引用本文:

蔡剑, 刘道新, 叶作彦, 张晓化, 何宇廷, 崔腾飞. 腐蚀与交变载荷循环作用对2A12-T4铝合金疲劳寿命的影响[J]. 中国腐蚀与防护学报, 2015, 35(1): 61-68.
Jian CAI, Daoxin LIU, Zuoyan YE, Xiaohua ZHANG, Yuting HE, Tengfei CUI. Influence of Cyclic Action of Corrosion and Alternate Load on Fatigue Life of 2A12-T4 Aluminum Alloy. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 61-68.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.255 或 https://www.jcscp.org/CN/Y2015/V35/I1/61

图1 试样尺寸

图2 腐蚀与疲劳交替实验方案

图3 腐蚀与疲劳交替频次对铝合金疲劳寿命的影响

图4 腐蚀与疲劳交替不同频次试样的断口形貌

图5 腐蚀与疲劳交替不同频次试样的断口最大腐蚀区形貌

图6 腐蚀方式对铝合金疲劳寿命的影响

图7 不同腐蚀方式试样断口形貌

图8 不同腐蚀方式试样疲劳断口腐蚀区形貌

图9 不同腐蚀方式试样表面腐蚀形貌

图10 不同腐蚀方式试样表面最大腐蚀坑的三维立体显微形貌

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