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| You
can use the PCB with bear copper tracks but they will
quickly start to oxidise. I applied a coating of liquid Tin. Just
immerse
the board in the solution for 1 to 4 min depending on the thickness of
the coating you require, I left it in for 2 min. Its best done straight
after you have removed the etching mask with acetone and the newly
exposed copper is not contaminated in any way. With all these processes
you need to regularly if not constantly agitate the solution to aid its
progress and prevent small air bubbles from masking areas. The Tin
coating is only a few microns thick but it protects the copper and
makes soldering easier. As you can see, the level of detail achievable
with this process is very fine, as a guide, the hole guides for the
component
legs are 0.5mm dia on the artwork and the lines around the edge of the
board (cutting guide) are only 0.2mm wide. |
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