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    如何在不銹鋼上進行錫焊?

    今天想起要修復一枝跌斷了 FPC (JenSon 兄提點: 係 flexible printed circuits, 一種塑膠 PCB 排線 ) 的鏡頭(一共三排!), 於是在網上 search 了一些資料
    無意中發現這個有趣又有用的問答:
     
      铜是可锡焊的,其实大多数金属都可锡焊。
      焊锡是锡铅锑合金,熔化后可与其它金属表面形成晶格,当然由于焊锡机械强度本来就差,所以机械特性不好。但焊锡的主要功能是形成导电,这样只要电气性能上符合要求就可以了。
      最易锡焊的金属:如金、银、铜等有什么特点呢?表面氧化膜不易生成或在锡焊温度下形成氧化膜的速度慢。当然,如果这类金属氧化膜本身就厚的话,也是不易锡焊的。你可以用根发黑的铜线试试看。
      有焊接难度的常用金属:如铁,包括生铁和钢,由于表面容易生成氧化膜,而且温度越高,氧化速度越快,这类金属的焊接,大家都是用焊锡膏,先用机械的方法清理表面氧化层,然后涂上焊锡膏,这样就可以进行正常锡焊,不锈钢也可以用这种方法进行锡焊。当然不同的不锈钢也要采用不同的方法,如430类,用焊锡膏就行了,对301类,用焊锡膏也不易锡焊,这时,可以用稀释二十倍以上的盐酸做助焊剂,焊接完成后,电烙铁不要马上拿开,再加热几秒钟使多余的盐酸受热挥发。
      最难焊的常用金属:如铝,由于铝表面只要暴露在空气中,就会形成氧化膜,这样,大多数助焊剂对铝根本就不起作用,所以铝的焊接相当困难。但是我们可以用擦焊的方式来对铝进行焊接,大家可以试一下,用一个铝币,电铬铁沾上溶化的锡在铝币上磨擦,稍稍用点力磨擦,你可以发现铝上也可以焊上锡。但如果你用20w的电铬铁在高压锅上试,那您就当我什么也没说过。
    作者:cf100  2005-4-23 22:28:00
     
    我所講的 FPC 排線是甚麼? 打開噴墨打印機的蓋子你便會看到一大片, 從打印頭伸出來那便是。

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