当量加速腐蚀环境对航空铝合金疲劳寿命影响研究  

Effect of equivalent accelerated corrosion environment on fatigue life of aviation aluminum alloy

作　　者：孙汉斌 陈先民[1] 沈子实 Sun hanbin;Chen Xianmin;Shen Zishi(National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi'an,Shaanxi,710065,China)

机构地区：[1]中国飞机强度研究所强度与结构完整性全国重点实验室,陕西西安710065

出　　处：《飞行器强度研究》2024年第2期22-28,共7页Aircraft Strength Research

摘　　要：基于某海洋区域环境谱,根据当量折算系数方法编制了当量加速腐蚀环境试验谱,利用周期浸润腐蚀试验设备等效模拟出服役环境条件的腐蚀损伤。针对2024-T42航空铝合金试件进行了4种不同时间的当量加速腐蚀试验,当量加速腐蚀试验时间对应的真实外场时间为5a、10a、20a、30a。利用三维光学显微镜对腐蚀后试件的形貌进行了测量分析,随着腐蚀时间的增加,试件表面的腐蚀形貌逐渐由点腐蚀、点腐蚀连通向均匀腐蚀转变,且蚀坑深度和宽度增大;此外对试件进行了称重分析,随着腐蚀时间的增加,试件的重量逐渐减少。对腐蚀后的试件进行了疲劳试验,试验结果表明,随着腐蚀时间的延长,疲劳寿命逐渐减小,结构抗疲劳性能显著退化。Based on a spectra of a ocean area,the equivalent accelerated corrosion environmental test spectrum was pre-pared according to the equivalent conversion coefficient method,and the corrosion damage under service environmental con-ditions was equivalent simulated by the periodic infiltration corrosion test equipment.Four kinds of equivalent accelerated corrosion tests were carried out for 2024-T42 aviation aluminum alloy specimens at different times,and the actual field time corresponding to the equivalent accelerated corrosion test time was 5a,1oa,20a and 30a.The morphology of the specimen after corrosion was measured and analyzed by three-dimensional optical microscope.With the increase of corrosion time,the corrosion morphology of the specimen surface gradually changed from point corrosion.point corrosion to uniform corrosion,and the depth and width of the corrosion pit increased.In addition,the weight analysis of the specimen shows that with the increase of corrosion time,the weight loss rate of the specimen increases.Fatigue test was carried out on the corroded specimens.The test results show that the fatigue life decreases gradually with the prolongation of corrosion time.and the fa-tigue resistance of the structures deteriorates significantly.

关 键 词：当量加速腐蚀 周期浸润 腐蚀形貌 重量 疲劳寿命 

分 类 号：TG1[金属学及工艺—金属学]