一、前言众所周知,铝的比重为钢的三分之一,其耐腐蚀性能好,强度相当高,它作为轻型结构材料而被广泛地应用着.尤其是在抗腐蚀性能方面,由于发展了多种表面处理方法,提高了各种环境下使用的耐久性,另外,过去在连接上问题比较多,而目前特别在焊接、钎焊、粘接等方面加紧做了改进,正在用铝材代替铜材来制做热交换器. I. Preface As we all know, the proportion of aluminum is one-third of the steel, its corrosion resistance, strength is very high, it is widely used as a lightweight structural materials.Especially in the corrosion resistance, due to the development of more Kinds of surface treatment methods to improve the durability of the use of a variety of environments, in addition, in the past on the connection more problems, but especially in the welding, brazing, bonding and other areas to step up improvements have been made of aluminum instead of copper Material to make heat exchanger.