不同腐蚀环境下铝合金自冲铆接头静力学性能研究

Study on Static Properties of Self-piercing Riveted Joints in Aluminum Alloy Under Different Corrosive Environments

以0.6 mol/L的NaCl溶液和0.02 mol/L的NaHSO 3溶液作为腐蚀溶液对5052铝合金自冲铆试件进行干湿周浸腐蚀实验,通过腐蚀动力学、静力学测试和能谱分析,研究接头在两种腐蚀环境下的静力学性能及失效机理。结果显示,两种腐蚀环境下腐蚀速率均随腐蚀周期的延长而降低,腐蚀环境对接头失效形式无显著影响。酸性环境对试件的质量损失量和接头静强度的不利影响更为显著,对接头抗冲击能力影响较小,腐蚀产物为氧化铝和铝的硫酸盐水合物;盐性环境降低了接头的抗冲击能力,短期腐蚀环境对接头静强度有所提高,腐蚀产物为铝的氧化物和氯化物。

Cyclic wet-dry immersion corrosion test of self-piercing riveted specimens in 5052 aluminum alloy was carried out with 0.6 mol/L NaCl solution and 0.02 mol/L NaHSO 3 solution as corrosion solution.Based on corrosion kinetics,statics test and energy dispersive X-ray,the static properties and failure mechanism of joints were analyzed under two corrosive environments.The results show that the corrosion rate decreases with the prolongation of the corrosion period in two corrosive environments,and the corrosive environment has no significant effect on the failure mode of the joint.The acidic environment is unfavorable to the weight loss of the specimen and the static strength of the joint,and has less in-fluence on the impact resistance of the joint.The corrosion products are alumina and aluminum sulfate.The saline environment reduces the impact resistance of joint,and static strength of joint is improved in short-term corrosion environment.Corrosion products are aluminum oxides and chlorides.