J
Jon Slaughter
I created a pcb board and tinned it using some product(now discontinued I
think) from MG chemicals.
http://i36.tinypic.com/30hq5uw.jpg
The method was after etching I removed the resist using 1:1 NaOH(Maybe too
strong or waste but doens't matter). I then rinsed the boards using water
and dried them off. Poured the tin solution over them. They "tinned" up
almost immediately.
The color in the pictures look much worse than it is. In the proper light
and angl ethey look really nice with almost a constant tin color.
But I'm curious as to what I could do in the future to improve the look and
prevent that discoloration. I guess it's some type of precipitant from the
solution... maybe because the board had water moisture. Note that the copper
did not oxidate because I kept them in the NaOH solution while I was
preparing to Tin them(and the time lapse was only a few mins). It's possible
I needed to sand the copper slightly but After removing the photoresist I
can't imagine it would have been oxidized at all.
I have noticed this on other boards I did previous too. Not sure if a slight
sanding/polishing would do any good but I don't want to remove the tin.
Anyone know whats going on?
think) from MG chemicals.
http://i36.tinypic.com/30hq5uw.jpg
The method was after etching I removed the resist using 1:1 NaOH(Maybe too
strong or waste but doens't matter). I then rinsed the boards using water
and dried them off. Poured the tin solution over them. They "tinned" up
almost immediately.
The color in the pictures look much worse than it is. In the proper light
and angl ethey look really nice with almost a constant tin color.
But I'm curious as to what I could do in the future to improve the look and
prevent that discoloration. I guess it's some type of precipitant from the
solution... maybe because the board had water moisture. Note that the copper
did not oxidate because I kept them in the NaOH solution while I was
preparing to Tin them(and the time lapse was only a few mins). It's possible
I needed to sand the copper slightly but After removing the photoresist I
can't imagine it would have been oxidized at all.
I have noticed this on other boards I did previous too. Not sure if a slight
sanding/polishing would do any good but I don't want to remove the tin.
Anyone know whats going on?