钢-铝异种金属自冲铆接头酸性环境下的失效行为分析
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摘要
以摩尔浓度为0.02 mol/L的NaHSO_3溶液为腐蚀溶液进行钢(DP590)-铝(AA5052)异种金属自冲铆试件干湿周浸腐蚀试验,通过腐蚀动力学和静力学测试,研究自冲铆接头在酸性腐蚀环境下的静强度,并分析接头失效机理。结果表明:随腐蚀周期的延长,试件质量损失和腐蚀速率均呈先增大后减小趋势,板材与铆钉腐蚀程度不断加重;试件接头失效形式主要有3种(L、M和N形),其对试件静强度影响较大,M形失效试件静强度值远大于其他两种;失效位移对试件能量吸收值影响显著,M形失效试件能量吸收值最小。
Cyclic wet-dry immersion corrosion test of self-piercing riveted(SPR)specimens of steel(DP590)-aluminum(AA5052)dissimilar metal was carried out with 0.02 mol/L NaHSO3 solution as corrosion solution.The SPR joints were studied by corrosion kinetics and statics tests.The static strength of the SPR joints in acid corrosive environment was studied,and the failure mechanism of joints was analyzed.Corrosion test results show that the weight loss and corrosion rate of the specimens increase first and then decrease with the increase of corrosion cycle,and the corrosion degree of the sheets and rivets is increasing.In the static test,the failure modes of the specimen joints are mainly three kinds(L,M and N shape),which have a great influence on the static strength of the specimens.The static strength of the test piece in the M-shaped failure mode is much higher than that in two other failure modes.The failure displacement has a significant effect on the energy absorption value,the test piece joint in the M-shaped failure mode has the smallest energy absorption value.
Cyclic wet-dry immersion corrosion test of self-piercing riveted(SPR)specimens of steel(DP590)-aluminum(AA5052)dissimilar metal was carried out with 0.02 mol/L NaHSO3 solution as corrosion solution.The SPR joints were studied by corrosion kinetics and statics tests.The static strength of the SPR joints in acid corrosive environment was studied,and the failure mechanism of joints was analyzed.Corrosion test results show that the weight loss and corrosion rate of the specimens increase first and then decrease with the increase of corrosion cycle,and the corrosion degree of the sheets and rivets is increasing.In the static test,the failure modes of the specimen joints are mainly three kinds(L,M and N shape),which have a great influence on the static strength of the specimens.The static strength of the test piece in the M-shaped failure mode is much higher than that in two other failure modes.The failure displacement has a significant effect on the energy absorption value,the test piece joint in the M-shaped failure mode has the smallest energy absorption value.
引文
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[2]金鑫,李永兵,楼铭,等.基于正交试验的铝合金一高强钢异种金属自冲铆接工艺优化[J].汽车工程学报,2011,1(3):185-191.
[3]冯先锋.盐水环境下2024-T351铝合金的腐蚀疲劳强度研究[D].杭州:浙江大学,2014.
[4]HE X,PEARSON I,YOUNG K. Self-pierce riveting for sheet materials:State of the art[J]. Journal of Materials Processing Technology,2008,199(1/2/3):27-36.
[5]邢保英,何晓聪,王玉奇,等.铝合金自冲铆接头静力学性能及失效机理分析[J].焊接学报,2015,36(9):47-50.
[6]张学元,安百刚,韩恩厚,等.酸雨对材料的腐蚀/冲刷研究现状[J].腐蚀科学与防护技术,2002,14(3):157-160.
[7]黄雄,朱春东,于凤群. DP590双相高强钢焊缝在模拟酸雨溶液中的腐蚀行为[J].热加工工艺,2017(17):187-190.
[8]王振尧,马腾,韩薇,等. LC4铝合金在模拟污染大气环境中的腐蚀行为[J].中国腐蚀与防护学报,2005,25(6):321-326.
[9]CALABRESE L,PROVERBIO E,POLLICINO E,et al. Effect of galvanic corrosion on durability of aluminium/steel selfpiercing rivet joints[J]. British Corrosion Journal,2015,50(1):10-17.
[10]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会. GB/T 19746—2005/ISO 11130:1999金属和合金的腐蚀盐溶液周浸试验[S].北京:中国标准出版社,2005.
[11]林鑫,杜敏,李成杰,等. DH36钢焊接件海水腐蚀行为研究[J].中国海洋大学学报(自然科学版),2013,43(3):70-74.
[12]孙培强.正确选择统计判别法剔除异常值[J].计量技术,2013(11):71-73.