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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。
The cyclic corrosion and fatigue cycles of 2A12-T4 typical aviation aluminum alloy were investigated. The effects of corrosion and fatigue loading on alternate cycles, corrosion modes (cyclic wet corrosion, salt spray corrosion, salt spray corrosion and hot and humid corrosion) on 2A12-T4 aluminum Effect and mechanism of degradation regularity of fatigue properties of alloy. The results show that under the condition of the same total corrosion time, the cyclic frequency of corrosion and fatigue alternate cycle has an important influence on the fatigue life of aluminum alloy. With the increase of alternating frequency, the fatigue life of aluminum alloy increases gradually, and the cycles alternate for 2, 4 and 6 times The fatigue life of the aluminum alloy specimens increased by 16.9%, 30.7% and 50.3% respectively compared with the fatigue life of the alternate one sample. Corrosion mode also has an important impact on the fatigue life of aluminum alloy. The order of the corrosion modes that affect the fatigue life of aluminum alloy is as follows: salt spray corrosion> periodic wetting corrosion> salt spray and hot wet cyclic corrosion. The impact of the above rules and corrosion factors and the weight of the intrinsic mechanism is closely related.