Cleaning leaked electrolytic & corrosion on PCB
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From: DaveC on 10 Apr 2010 14:15 What is the best method for cleaning up leaked electrolyte? This PCB has some corrosion on IC leads and vias. Is there a corrosion neutralizer that would be effective? Since the potential for corrosion in places that aren't accessible (deep in the vias), a liquid that can neutralize corrosion is called for. Would something like DeOxit work in such an application? This is on a Tek scope acquisition board. Thanks.
From: N_Cook on 10 Apr 2010 14:56 DaveC <invalid(a)invalid.net> wrote in message news:0001HW.C7E60E6D00EF5EC4B01AD9AF(a)news.eternal-september.org... > What is the best method for cleaning up leaked electrolyte? This PCB has some > corrosion on IC leads and vias. > > Is there a corrosion neutralizer that would be effective? Since the potential > for corrosion in places that aren't accessible (deep in the vias), a liquid > that can neutralize corrosion is called for. > > Would something like DeOxit work in such an application? > > This is on a Tek scope acquisition board. > > Thanks. > litmus test first to see of acidic or alkaline and go for the opposite as cleaner ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://diverse.4mg.com/index.htm
From: ian field on 10 Apr 2010 15:13 "DaveC" <invalid(a)invalid.net> wrote in message news:0001HW.C7E60E6D00EF5EC4B01AD9AF(a)news.eternal-september.org... > What is the best method for cleaning up leaked electrolyte? This PCB has > some > corrosion on IC leads and vias. > > Is there a corrosion neutralizer that would be effective? Since the > potential > for corrosion in places that aren't accessible (deep in the vias), a > liquid > that can neutralize corrosion is called for. > > Would something like DeOxit work in such an application? > > This is on a Tek scope acquisition board. > > Thanks. > If you can beg or borrow an ultrasonic cleaner, ordinary water with a dash of washing up liquid will do fine, Any crystals or ceramic resonaters should be removed before ultrasonic cleaning. If the construction of any components mean they trap water, a second dip without detergent will be needed, and you may have to bake the board to dry everything - the pre-heat phase on a SMD oven should do it.
From: James Sweet on 10 Apr 2010 15:20 DaveC wrote: > What is the best method for cleaning up leaked electrolyte? This PCB has some > corrosion on IC leads and vias. > > Is there a corrosion neutralizer that would be effective? Since the potential > for corrosion in places that aren't accessible (deep in the vias), a liquid > that can neutralize corrosion is called for. > > Would something like DeOxit work in such an application? > > This is on a Tek scope acquisition board. > > Thanks. > I scrub with white vinegar and a toothbrush, then rinse with alcohol. If the corrosion is more severe, mechanical methods may be needed, Scotchbrite type cleaning pads work well but you have to be careful not to damage fine traces. In some cases it's best to neutralize and then clean off as much residue as possible and then leave the remaining corrosion alone.
From: John Larkin on 10 Apr 2010 15:43
On Sat, 10 Apr 2010 11:15:57 -0700, DaveC <invalid(a)invalid.net> wrote: >What is the best method for cleaning up leaked electrolyte? This PCB has some >corrosion on IC leads and vias. > >Is there a corrosion neutralizer that would be effective? Since the potential >for corrosion in places that aren't accessible (deep in the vias), a liquid >that can neutralize corrosion is called for. > >Would something like DeOxit work in such an application? > >This is on a Tek scope acquisition board. > >Thanks. Dishwasher. John |