( 1. 南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院， 南京 210016；
2. 哈爾濱焊接研究所， 哈爾濱 150080；
3. 哈爾濱工業(yè)大學(xué) 現(xiàn)代焊接技術(shù)生產(chǎn)國(guó)家重點(diǎn)實(shí)驗(yàn)室，
哈爾濱 150001)
摘 要: 采用CsF-AlF3中溫?zé)o腐蝕釬劑能夠去除LY12鋁合金表面復(fù)雜的氧化膜， 實(shí)現(xiàn)LY12鋁合金的中溫釬焊。 研究發(fā)現(xiàn)： 改進(jìn)的CsF-AlF3釬劑是以反應(yīng)、溶解方式去除氧化膜的； 在去膜過(guò)程中， CsF化合物起主要去膜作用，釬劑的高活性與NH4F、 NH4AlF4及復(fù)合鹽熔體等化合物的存在有關(guān)，它們的存在可提高CsF-AlF3釬劑的去膜能力，而HF的生成則是誘發(fā)和加速反應(yīng)、 提高溶解去膜能力的關(guān)鍵；微量稀土元素鑭未在界面出現(xiàn)富集現(xiàn)象， 微量的稀土氟化物則起著 “助溶”的作用。
關(guān)鍵字: LY12鋁合金；氧化膜； 稀土氟化物； 釬劑； 鑭
oxide film of LY12 aluminum alloy
（ 1. College of Materials Science and Technology,
Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China;
2. Harbin Welding Institute, Harbin 150080, China;
3. State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,
Harbin 150001, China）
Abstract: The technology for brazing LY12 aluminum alloy at middle temperature was realized by using CsF-AlF3 no-cleaning flux that can remove the complicated oxide films on the surface of LY12 aluminum alloy. It is found that the improved brazing flux CsF-AlF3 can remove the oxide film by way of reacting and/or dissolving the oxide film, and the compound CsF plays an important role in the course of removing the oxide film. The high activation of the flux has something to do with NH4F, NH4AlF4 as well as other complicated molten salts, and the ability to removing the oxide film by the flux can be enhanced owing to the existence of above compounds. It is the key step that the formation of HF causes and speeds up the reaction of removing oxide film and promotes the ability to dissolving oxide film. No gathering phenomenon emerges on the surface of brazing seam for the trace rare-earth element La and the rare earth fluorides play “dissolving-aided” role in brazing.
Key words: LY12 aluminum alloy; oxide film; rare earth fluoride; flux; lanthanum
