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Topic: PCB cleaning. (Read 11654 times) previous topic - next topic

cjdelphi

Oric, yeah but, leaving flux on makes it look messy.... where's that nice smooth clean finish only Isopro...Alcohol can do that with a bit of abrasion ...

oric_dan

Ummm, no. As I said, if you really want a nice clean board, you don't really need to put the gooey flux on there in the first place. Get some aqueous core solder and see for yourself.

OhMyCod

Quote
If I do wish to have a clean board, for whatever reason


I must admit I'm not that bothered about cleaning a board to make it look nice, but after inspecting a couple of boards under a 20x binocular microscope I was shocked at just how much cr4p was left on what appeared to be clean board. I'm not that worried about flux corroding anything, but I have noticed lots of tiny solder flakes which may cause problems.


oric_dan

I've not heard tell of lots  of tiny solder flakes before. I wonder what that's about?

SirNickity

Sounds like a new kind of cereal marketed toward young engineers.

polymorph

He said he's cleaning his boards, and asked for advice on how to better clean them. As for myself, when using leaded solder, I rarely clean the flux off. Usually it isn't a problem.

For lead-free solder, I use "No clean" flux, or I clean the boards. Lead-free fluxes tend to be much more corrosive.

Why are people saying electrolytic caps are not well-sealed? If they were not, they'd dry out in a few weeks.
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JChristensen


Oh lord, talk about an enormous P!TA. After years of soldering, I disagree with what everyone else here has said [LOL]. I "never" remove the rosin flux, just leave it on. The joints don't dissolve or corrode like some people seem to think.


It's strictly a vanity thing with me, I harbor no delusions of corrosion etc.. I have PCBs, kept in my basement literally for decades, soldered with Kester 44 and not cleaned, that show no sign of problems, the bare copper is even still shiny (homemade boards).

Even though I pretty much exclusively use solder with "no-clean" flux, I still clean it off. Especially on SMT boards, makes them look much nicer.

oric_dan


Why are people saying electrolytic caps are not well-sealed? If they were not, they'd dry out in a few weeks.

Are they sealed well enough to immerse under water? I just assume they are not, at least the through-hole kind. The smt kind may be better sealed.

oric_dan


I have PCBs, kept in my basement literally for decades, soldered with Kester 44 and not cleaned, that show no sign of problems, the bare copper is even still shiny (homemade boards).

Ditto here.

OhMyCod

Quote
I've not heard tell of lots  of tiny solder flakes before. I wonder what that's about?


you can't see them with the naked eye - you need about 20x magnification to see them.

I think what happens is that when I trim off the leads of through-hole components very close to the solder tiny bits of metal get generated by the blades of the wire snippers.

oric_dan


pwillard

Wet dielectric electrolytic's are liquid tight and there i no issue with liquid immersion.  Honestly, I'm trying to figure out where this misconception is coming from.  A typical inexpensive through-hole electrolytic has a rubberized base very tightly fit into the molded aluminium can.  Sure, electrolytic's have been assembled to allow methods of bursting to occur under dire circumstances, but that does not mean they are not liquid tight.

(deleted)


JChristensen


I buy a pack of tooth-brushes from our local pound store every couple of months, as the Acetone does affect them.


I'd be afraid that acetone would also affect components on the boards.

JimboZA



I buy a pack of tooth-brushes from our local pound store every couple of months, as the Acetone does affect them.


I'd be afraid that acetone would also affect components on the boards.


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