5083与5A30铝合金应力腐蚀行为对比  

A comparative study on stress corrosion cracking behavior of 5083 and 5A30 aluminum alloys

作　　者：冷文兵 罗铭强 陈树钦 

机构地区：[1]广东兴发铝业有限公司,广东佛山528061

出　　处：《轻合金加工技术》2015年第12期45-49,共5页Light Alloy Fabrication Technology

基　　金：广东省教育部产学研结合项目(2010A090200078)

摘　　要：采用慢应变速率拉伸(SSRT)测试了5083和5A30铝合金型材的应力腐蚀开裂(SCC)敏感性,对比研究了两种合金的自腐蚀电位、显微组织及断口形貌。结果表明,两种铝合金在质量分数为3.5%的Na Cl溶液中都具有SCC敏感性;5A30铝合金在空气中的抗拉强度及伸长率均比5083铝合金的高,但5A30铝合金的应力腐蚀敏感指数(ISSRT)比5083铝合金的高得多,5A30铝合金具有更高的应力腐蚀敏感性;随着镁含量的增加,铝合金的自腐蚀电位下降,β相在晶界析出增多,并呈网状连续分布,容易引起沿晶SCC。The stress corrosion cracking （SCC） susceptibility of 5083 and 5A30 aluminum alloys were investigated by using slow strain rate tension （SSRT）, and they were compared on the aspects of free corrosion potential,microstructure,and fracture surface. The results indicate that both of 5083 and 5A30 aluminum alloys are all susceptible to SCC in 3.5% NaCl water solution. 5A30 aluminum alloy has higher tensile strength and elongation than 5083 aluminum alloy in the air,but 5A30 aluminum alloy has much higher ISSRT and is more suscep- tible to SCC. As Mg content increases, the corrosion potential decreases, and a continuous network of β-phase precipitates at boundaries,prone to initiate intergranular SCC.

关 键 词：铝-镁合金 慢应变速率拉伸 应力腐蚀敏感性 

分 类 号：TG146.21[一般工业技术—材料科学与工程]