铝钎焊接头中Cu的腐蚀与扩散行为_宋强.pdfVIP

28 2 Vol.28 No.2 2002 6 Journal of Gansu University of Technology Jun. 2002 : 1000-5889(2002) 02-0019-04 铝钎焊接头中Cu 的腐蚀与扩散行为 宋 强, 陈学定, 俞伟元, 宋 ( , 730050) : 应用X 射线衍射仪扫描电镜和能谱分析仪,研究了A-l S-i Cu 钎料中Cu 在真空钎焊接头中 的腐蚀与 散行为. 研究结果表明, 真空钎焊后的接头仍然存在腐蚀问题, 如点蚀和晶间腐蚀等,并 且随着w (Cu) 的增加腐蚀加重. Cu 在钎焊接头中以晶界 散为主, 且晶界 散比晶内 散快. : 真空钎焊; 腐蚀; 散 : TG425.2 : A Corrosi ve and diffusive behaviors of Cu in the aluminum brazed j oints SONG Qiang, C EN Xue-ding, YU We-i yuan, SONG Chong-yang (College of Materials Science and Engineering, Gansu Univ. of Tech. , Lanzhou 730050, China) Abstract: Corrosive and diffusive behaviors of Cu in Al-Si-Cu brazing filler under vacuum brazing are studied with X-ray diffraction(XRD) , scanning electron microscopy(SEM) , and energy disperse X-ray spectrometry (EDX) . The results show that corrosions such as pitting and intergranular corrosion occur again in the brazed joints and the corrosions become more serious with increase of Cu amount. The diffusion of Cu in the joints is mainly the intergranular one, and it goes more quickly than diffusion within grains. Key words: vacuum brazing; corrosion; diffusion . 1 试验方法 ,. 1. 1 , . , L2. w (Cu), Al- , [ 1~ 4] ,, S-i Cu , 1. , 1. 2 . , (+ - 3 , ) , 10 Pa , ,15 min, GB 11364 89 . (Spreadability test) . A-l Si-Cu 1. 3 , Cu , 3. 5% NaCl (p 7) .3. 5%NaCl : 2002-01-16 ,, : (GS002-A52-026)