2024铝合金连接结构两种防护涂层耐蚀性研究

目的研究铝合金两种防护涂层在5%NaCl盐雾环境下的腐蚀疲劳性能。方法针对在两种涂层防护作用下的2024铝合金连接结构,开展实验室加速试验,采用"腐蚀环境-疲劳加载"交替循环的试验模式,得到铝合金两种防护涂层在5%NaCl盐雾环境下的腐蚀疲劳寿命值,对比分析涂层体系对铝合金连接结构的腐蚀疲劳寿命影响。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,相较于传统涂层,纳米涂层在5%NaCl盐雾环境下的防护效果更好。结论纳米涂层表面破坏后快速生成的致密氧化膜能有效提高涂层的耐蚀性能。

Corrosion Resistance of Two Protective Coatings of 2024 Aluminum Alloy Structure

Objective To study the corrosion fatigue properties of 2 protective coatings of aluminum alloy in 5% NaCl salt fog environment. Methods The laboratory accelerated test was carried out for 2024 aluminum alloy connection structure under two coating protective effects. The experimental model of "corrosion environment-fatigue loading" alternating cycle was adopted to obtain the corrosion fatigue lifetime values of two aluminum alloy protective coatings under 5% NaCl salt fog environment. The effect of coating system on corrosion fatigue life of aluminum alloy structure was analyzed. Results The study showed that 5% NaCl salt fog environment had a great influence on the fatigue life of aluminum alloy connection structure, and the Nano coating had better protection effect than the traditional coating in 5% NaCl salt fog environment. Conclusion The rapid formation of oxide film after the coating surface densification and destruction can improve the corrosion resistance of the coating effectively.