腐蚀环境下异质自冲铆接头静力学性能研究

Study on Static Mechanical Properties of Heterogeneous Self-piercing Riveted Joints in Corrosion Environments

为研究钢铝异质自冲铆接头在盐腐蚀和酸腐蚀中静力学性能的变化,对DP590-5052自冲铆试件进行干湿周浸加速腐蚀实验,通过腐蚀动力学和静力学测试分析不同腐蚀时间接头的失重量、失效模式和静失效载荷性能。结果表明,盐腐蚀环境中钢铝试件(YDA)组失重量呈现上升趋势,腐蚀速率则逐渐减小;酸腐蚀(SDA)组试件失重量先上升后下降,腐蚀速率也呈现出相同的趋势。酸腐蚀对接头失效模式影响更为显著。两种腐蚀对接头静强度均有影响,接头对盐性环境的抗腐蚀性能较小。

In order to study the change of static mechanical properties of heterogenous self-piercing riveted joints in steel-aluminium for salt and acid corrosion,dry-wet periphery immersion accelerated corrosion test was carried out on self-piercing riveted specimens in DP590-5052(DA).The weight loss,failure mode and static load performance of joints at different corrosion times were analyzed by corrosion kinetics and static test.The results show that in salt corrosion environment,the weight loss of steel-aluminium specimens(YDA)group shows an upward trend,while the corrosion rate decreases;in acid corrosion,the weight loss of steel-aluminium specimens(SDA)group first increases and then decreases,and the corrosion rate also shows the same trend.The effect of acid corrosion on joint failure mode is more significant.The static strength of the joint are affected by both kinds of corrosions,and the corrosion resistance of the joint to salt environment is smaller.