有什么办法可以防止自己做的PCB板子氧化吗，我腐蚀的PCB板老是过一段时间后就变黑了
推荐回答（2个）
答：当前PCB板表面处理的方式有以下几种：镀金、镀银、涂布松香、OSP（抗氧化）、喷锡等，作为自己加工，而不是工厂化生产，涂布松香的方法是最为简单，而且是最有效的方法，麻烦就是会麻烦一点，但是如果说难看可能是因为方法有问题，正确方法是首先要将表面的氧化层处理掉，最好用点硫酸加点双氧水来处理，然后水洗烘干，这里要确保表面没有氧化。再把PCB板放斜，再把松香水从高端倒下，等整个板都浸润了，把板放到干燥处或用风扇吹干就可以了，这样比较美观。
一般沉铜、整板电镀后的板子大多会经过：（一）1-3%的稀硫酸处理；（二）75-85℃的高温烘干；（三）然后插架或叠板放置，等待贴干膜或印制湿膜做图形转移；（四）而在此过程中，板子少则需放置2-3 天，多则5-7 天；（五）此时的板面和孔内铜层早就氧化成“黑乎乎”的了。
在图形转移的前处理，通常都会采用“3%的稀硫酸+磨刷”的形式对板面铜层进行处理。而孔内只有靠酸洗的处理效果了，且小孔在前面的烘干过程中是很难达到理想效果的；因此小孔内往往因干燥不彻底、藏有水份，其氧化程度也比板面严重的多，仅靠区区酸洗是无法清除其顽固的氧化层的。这就可能导致板子经图形电镀、蚀刻后造成因孔内无铜而报废。
多层板内层的防氧化
通常内层线路完成后，即经过显影、蚀刻、退膜及3%稀硫酸处理。然后通过隔胶片的方式存放与转运及等待AOI 扫描与测试；虽然在此过程中，操作、转运等都会特别小心与仔细，但板面还是难免有诸如手指印、污点、氧化点等之类的瑕疵；在AOI 扫描时会有大量的假点产生，而AOI 的测试是根据扫描的数据进行的，即所有的扫描点（包括假点）AOI 都要进行测试，这样就导致了AOI的测试效率非常低下。
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