Cleaning leaked electrolytic & corrosion on PCB
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From: JW on 12 Apr 2010 05:48 On Sun, 11 Apr 2010 10:16:27 GMT nico(a)puntnl.niks (Nico Coesel) wrote in Message id: <4bc1a14f.1099558906(a)news.planet.nl>: >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. > >Hmm, you bought a TDS5xx? There is a lot about cleaning these board on >the Tektronix user forum on their website. Many TDS 6XX scopes also had this problem. I run them through a dish washer first, then a Simple Green scrubbing followed by rinsing and blow dry using a compressor. After that I scrub 'em again with isopropyl alcohol, remove all the caps and replace with new ones. If it still doesn't pass it's diagnostics and SPC, start looking for open vias (usually black) and etches that are close to the areas where the worst of the leakage was.
From: krw on 12 Apr 2010 19:05 On Sun, 11 Apr 2010 22:04:24 -0700, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Sun, 11 Apr 2010 09:12:42 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On 11 Apr 2010 11:29:21 GMT, Robert Latest <boblatest(a)yahoo.com> >>wrote: >> >>>["Followup-To:" header set to sci.electronics.design.] >>>John Larkin wrote: >>>> 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. >>> >>>Excellent advice. A household dishwasher (with the normal powder >>>detergent) is an extremely cheap and powerful cleaning device for almost >>>anything. It took me a while to convince my ex-lab to use one for >>>cleaning larger UHV parts rather than an appropriately-sized ultrasonic >>>tank which would have cost the equivalent of 100 dishwashers. There are >>>things that a dishwasher isn't good enough for, but they are few. >>> >>>robert >> >>The usual powder will etch aluminum. I keep warning my wife not to put >>aluminum stuff in the dishwasher, and her response is "how can you >>tell that something is aluminum?" >> >>John >> > >There are just a few to learn, the dark gray (new) to near black of cast >iron, The pinkish orange of copper, the sheen of stainless steel (polished >with a specular surface and "brushed"), and if it is not recognizably one >of those it is aluminum. Most people keep track of their stainless steel >due to significant cost. Teflon coatings are normally easy to find and >normally occur on aluminum cookware and various utensils. There is a lot of anodized aluminum cookware, some black. Though even the black stuff is pretty easy to tell it's aluminum. If it's lighter than it looks, it's aluminum. If you paid over $200 per piece, it's stainless. ;-)
From: JosephKK on 13 Apr 2010 00:05 On Mon, 12 Apr 2010 18:05:49 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: >On Sun, 11 Apr 2010 22:04:24 -0700, "JosephKK"<quiettechblue(a)yahoo.com> wrote: > >>On Sun, 11 Apr 2010 09:12:42 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On 11 Apr 2010 11:29:21 GMT, Robert Latest <boblatest(a)yahoo.com> >>>wrote: >>> >>>>["Followup-To:" header set to sci.electronics.design.] >>>>John Larkin wrote: >>>>> 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. >>>> >>>>Excellent advice. A household dishwasher (with the normal powder >>>>detergent) is an extremely cheap and powerful cleaning device for almost >>>>anything. It took me a while to convince my ex-lab to use one for >>>>cleaning larger UHV parts rather than an appropriately-sized ultrasonic >>>>tank which would have cost the equivalent of 100 dishwashers. There are >>>>things that a dishwasher isn't good enough for, but they are few. >>>> >>>>robert >>> >>>The usual powder will etch aluminum. I keep warning my wife not to put >>>aluminum stuff in the dishwasher, and her response is "how can you >>>tell that something is aluminum?" >>> >>>John >>> >> >>There are just a few to learn, the dark gray (new) to near black of cast >>iron, The pinkish orange of copper, the sheen of stainless steel (polished >>with a specular surface and "brushed"), and if it is not recognizably one >>of those it is aluminum. Most people keep track of their stainless steel >>due to significant cost. Teflon coatings are normally easy to find and >>normally occur on aluminum cookware and various utensils. > >There is a lot of anodized aluminum cookware, some black. Though even the >black stuff is pretty easy to tell it's aluminum. If it's lighter than it >looks, it's aluminum. If you paid over $200 per piece, it's stainless. ;-) Not sure where you shop, but for me at least, $200 will buy a set of 3 or 4 pots with lids. I have no problem getting 24 quart w/lid for under $80.
From: krw on 13 Apr 2010 22:48 On Mon, 12 Apr 2010 21:05:30 -0700, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Mon, 12 Apr 2010 18:05:49 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: > >>On Sun, 11 Apr 2010 22:04:24 -0700, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >> >>>On Sun, 11 Apr 2010 09:12:42 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>> >>>>On 11 Apr 2010 11:29:21 GMT, Robert Latest <boblatest(a)yahoo.com> >>>>wrote: >>>> >>>>>["Followup-To:" header set to sci.electronics.design.] >>>>>John Larkin wrote: >>>>>> 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. >>>>> >>>>>Excellent advice. A household dishwasher (with the normal powder >>>>>detergent) is an extremely cheap and powerful cleaning device for almost >>>>>anything. It took me a while to convince my ex-lab to use one for >>>>>cleaning larger UHV parts rather than an appropriately-sized ultrasonic >>>>>tank which would have cost the equivalent of 100 dishwashers. There are >>>>>things that a dishwasher isn't good enough for, but they are few. >>>>> >>>>>robert >>>> >>>>The usual powder will etch aluminum. I keep warning my wife not to put >>>>aluminum stuff in the dishwasher, and her response is "how can you >>>>tell that something is aluminum?" >>>> >>>>John >>>> >>> >>>There are just a few to learn, the dark gray (new) to near black of cast >>>iron, The pinkish orange of copper, the sheen of stainless steel (polished >>>with a specular surface and "brushed"), and if it is not recognizably one >>>of those it is aluminum. Most people keep track of their stainless steel >>>due to significant cost. Teflon coatings are normally easy to find and >>>normally occur on aluminum cookware and various utensils. >> >>There is a lot of anodized aluminum cookware, some black. Though even the >>black stuff is pretty easy to tell it's aluminum. If it's lighter than it >>looks, it's aluminum. If you paid over $200 per piece, it's stainless. ;-) > >Not sure where you shop, but for me at least, $200 will buy a set of 3 or >4 pots with lids. I have no problem getting 24 quart w/lid for under $80. Williams-Sonoma, mostly You're not going to find quality stainless for that price. Much of it in that class will have aluminum bottoms.
From: Jim Yanik on 14 Apr 2010 09:06
"krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote in news:m4bas55c83gec3b70crp0shin2gj3esdnb(a)4ax.com: > On Mon, 12 Apr 2010 21:05:30 -0700, > "JosephKK"<quiettechblue(a)yahoo.com> wrote: > >>On Mon, 12 Apr 2010 18:05:49 -0500, "krw(a)att.bizzzzzzzzzzzz" >><krw(a)att.bizzzzzzzzzzzz> wrote: >> >>>On Sun, 11 Apr 2010 22:04:24 -0700, >>>"JosephKK"<quiettechblue(a)yahoo.com> wrote: >>> >>>>On Sun, 11 Apr 2010 09:12:42 -0700, John Larkin >>>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>>> >>>>>On 11 Apr 2010 11:29:21 GMT, Robert Latest <boblatest(a)yahoo.com> >>>>>wrote: >>>>> >>>>>>["Followup-To:" header set to sci.electronics.design.] >>>>>>John Larkin wrote: >>>>>>> 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. >>>>>> >>>>>>Excellent advice. A household dishwasher (with the normal powder >>>>>>detergent) is an extremely cheap and powerful cleaning device for >>>>>>almost anything. It took me a while to convince my ex-lab to use >>>>>>one for cleaning larger UHV parts rather than an >>>>>>appropriately-sized ultrasonic tank which would have cost the >>>>>>equivalent of 100 dishwashers. There are things that a dishwasher >>>>>>isn't good enough for, but they are few. >>>>>> >>>>>>robert >>>>> >>>>>The usual powder will etch aluminum. I keep warning my wife not to >>>>>put aluminum stuff in the dishwasher, and her response is "how can >>>>>you tell that something is aluminum?" >>>>> >>>>>John >>>>> >>>> >>>>There are just a few to learn, the dark gray (new) to near black of >>>>cast iron, The pinkish orange of copper, the sheen of stainless >>>>steel (polished with a specular surface and "brushed"), and if it is >>>>not recognizably one of those it is aluminum. Most people keep >>>>track of their stainless steel due to significant cost. Teflon >>>>coatings are normally easy to find and normally occur on aluminum >>>>cookware and various utensils. >>> >>>There is a lot of anodized aluminum cookware, some black. Though >>>even the black stuff is pretty easy to tell it's aluminum. If it's >>>lighter than it looks, it's aluminum. If you paid over $200 per >>>piece, it's stainless. ;-) >> >>Not sure where you shop, but for me at least, $200 will buy a set of 3 >>or 4 pots with lids. I have no problem getting 24 quart w/lid for >>under $80. > > Williams-Sonoma, mostly You're not going to find quality stainless > for that price. Much of it in that class will have aluminum bottoms. > the newer gel auto dishwasher products will not harm aluminum,or your PCBs. I believe they dissolve better than powders,too. the bad thing about some items and auto dishwashers is that the high water pressure bangs stuff around and into other items.Good knives are a no-no. But if you are cleaning a PCB,you do it with -nothing else- in the dishwasher..and the board on the top rack. No drying heat,either. Dry it in a hot box(with exhaust fan) or drying oven. no hotter than 150degF. -- Jim Yanik jyanik at localnet dot com |