6063铝合金阶梯焊中温钎料腐蚀性能  

Corrosion resistance of intermediate temperature filler metal for stepped welding to 6063 aluminum alloy

作　　者：朱宏[1,2] 薛松柏[1] 盛重[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]中国电子科技集团第十四研究所,南京210013

出　　处：《焊接学报》2009年第10期29-32,共4页Transactions of The China Welding Institution

基　　金：国防基础研究资助项目(B1120060474)

摘　　要：采用正交试验法,通过改变Si,Cu,Ni以及混合稀土RE元素的配比,研究了含量的变化对Al-Si-Cu-Ni-RE钎料的自腐蚀电位、失重质量、腐蚀速率的影响,并通过扫描电镜观察分析了腐蚀前后钎料的内部显微组织.研究发现,钎料的自腐蚀电位与与失重质量相对应,随着腐蚀电位的负值增加,失重质量也不断增大.结果表明,对钎料腐蚀速率的影响依次为Ni元素的影响最大,其次为Si,Cu,RE元素.对钎料腐蚀前后的显微组织观察分析可知,由于基体相α(Al)属于面心立方固溶体,使得Al-Si-Cu-Ni-RE钎料的力学性能优良,但钎料中黑色的脆性θ(CuAl2)相的存在对钎焊接头的性能有不利影响,Cl-是诱发钎料点蚀的主要原因.腐蚀后的钎料局部区域出现了点蚀,腐蚀后的钎料有明显的网纹状晶间腐蚀.The effects of contents of Si,Cu,Ni and RE on the corrosion potential,weightlessness and corrosion rate of Al-Si-Cu-Ni-RE filler metal were studied by using orthogonal test,and the microstructure of the corroded filler metal was analyzed by means of SEM and EDS.It is indicated that the corrosion potential of the filler metal is relative to its weightlessness,which with the increase of the negative value of corrosion potential,the weightlessness increases continuously.Based on the corrosion rates,the results show that Ni has the most important influence on the melting points,and then do Si,Cu and RE.Through observed and analyzed the microstructure of filler metal,it is found that the matrix phase α(Al) with face-centered cubic solid solution makes the performance of joint better,but black brittle phase θ(Al2Cu) makes the performance of joint poorer;Cl-is the prime cause of induced pitting corrosion of the filler metal,which the pitting corrosion in filler metal and the obvious inter-granular corrosion are found in local area after corrosion.

关 键 词：正交试验 腐蚀速率 点蚀 晶间腐蚀 

分 类 号：TG454[金属学及工艺—焊接]