论坛 › 绿色无铅 › 回流焊的时候为什么白色阻焊的线路板油墨会变黄？

hwpcb 发表于 2010-1-5 17:39:00

回流焊的时候为什么白色阻焊的线路板油墨会变黄？

<font size="5">请问专家，回流焊的时候为什么白色阻焊的线路板油墨会变黄？过回流焊的时候白色阻焊油墨会有一定程度上变黄，不知道是什么原因，请各位专家解答一下好吗？？？谢谢。。。。</font>

dhukewl 发表于 2010-2-5 01:07:00

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FPC-SM 发表于 2010-4-1 16:56:00

<p>油墨本身耐热性能不足。</p><p>或PCB制造采用先字符后镀金的流程，镀金药水残留在文字油墨内，在高温下发生了化学反应引起文字变色。</p>

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