两种铝合金连接结构的腐蚀-疲劳循环试验研究

Corrosion-Fatigue Cycle Test of Two Aluminum Alloy Connection Structures

目的研究2024铝合金两种连接形式在5%NaCl盐雾环境下的腐蚀疲劳性能。方法开展2024铝合金两种连接结构在5%NaCl盐雾环境下的腐蚀疲劳试验,采用“腐蚀环境-疲劳加载”交替循环的试验模式,通过试验测试铝合金两种连接形式在5%NaCl盐雾环境下的残余疲劳寿命值,分析连接方式对铝合金连接结构的残余疲劳寿命影响。结果5%NaCl盐雾环境对于铝合金连接结构疲劳寿命有较大影响,相较于铝制铆接连接形式,钢制螺栓连接方式连接部位的涂层破坏较少,涂层防护效果更好,疲劳寿命降低量更少。结论金属结构连接形式与防护涂层的搭配对结构耐腐蚀性能有重要影响。

Objective To study the corrosion fatigue properties of two joint forms of 2024 aluminum alloy in 5% NaCl salt spray. Methods Corrosion fatigue test of two joint structures of 2024 aluminum alloy was carried out in 5% NaCl salt spray en-vironment. the test mode of "corrosive environment-fatigue loading" alternate cycle was applied to get residual fatigue life values of two joint forms of aluminum alloy in 5% NaCl salt spray environment and Analyze the influence of connection method on residual fatigue life of aluminum alloy joint structure. Results 5% NaCl salt spray environment had a great impact on the fatigue life of aluminum alloy joint structure. Compared with the aluminum riveted joint, the steel bolted joint had less de- formation at the joint, better coating protection effect and less fatigue life reduction. Conclusion The combination of the metal structure connection form and the protective coating has an important influence on the corrosion resistance of the structure.