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isa-d
Joined: 16 Aug 2006
Posts: 2984
Location: Italy
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 Posted: Tue Dec 04, 2007 1:22 pm Post subject: Clean white ceramic chip |
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| Someone know a product or a method for delete the black scratch on white ceramic chip? |
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iguana
Joined: 24 Apr 2007
Posts: 2456
Location: Ottawa, Canada
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Tue Dec 04, 2007 2:15 pm Post subject: |
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| I think there is a thread somewhere here on this forum with many comments and suggestions on what to use to clean chips. |
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Windmiller
Joined: 24 Jun 2005
Posts: 1716
Location: Chapel Hill, NC
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Wed Dec 05, 2007 11:51 am Post subject: |
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| chiptalk wrote: | | I think someone used a pencil eraser too. I tried it and it worked a little. |
lol that was me.
A colleague of mine had the idea to try H2F acid. my pencil rubber was better:-)
btw, i use rubber in pencil style, not those bricks:-)
but there are still some metal scratches and other stuff that I don't get off too:-/ |
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donutty
Joined: 16 Feb 2008
Posts: 1122
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| Posted: Mon Dec 22, 2008 4:37 am Post subject: |
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Sorry to bump and old thread, but I've been using conc. HCl (hydrochloric acid); quite potent because when you open the bottle, fumes come out.
I've done about 10 chips so far that had nasty marks on them (caused from solder on the pins on the solder-side of PCBs rubbing against them) and so far they have come out looking 1000% better, almost like new.
I apply the acid to the most heavily scratched areas with a cotton bud (I hope that you on the other side of the pond now know this means 'Q-tip'), leave for 1/2 hour, wipe around the whole chip with the bud again, leave for 15 minutes, wash off under warm running water and ta-da!
I'll have to post some pictures of before and after... |
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el_gecko
Joined: 25 May 2005
Posts: 1553
Location: Nice, France
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| Posted: Mon Dec 22, 2008 6:33 am Post subject: |
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Sometime a rubber do a good job. Sometime soap and toothbrush works fine. Sometime scratches remains.
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My microprocessor collection: The Gecko's CPU Library |
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donutty
Joined: 16 Feb 2008
Posts: 1122
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| Posted: Mon Dec 22, 2008 6:44 am Post subject: |
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| Using HCl is a lot better because it actually 'dissolves' the scratches (which are actually made from solder in this case) |
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tlccomp
Joined: 11 May 2006
Posts: 1212
Location: Southeast Wisconsin, USA
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| Posted: Mon Dec 22, 2008 7:15 am Post subject: |
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| donutty wrote: |
I'll have to post some pictures of before and after... |
Interesting. Some before and after pictures would be nice.
My wife will be gone for a few days over the holidays and it would be a good time to try it 
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The two most common elements on Earth are oxygen and stupidity. |
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michefe
Joined: 13 Feb 2008
Posts: 155
Location: Roma (Italy)
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| Posted: Mon Dec 22, 2008 8:08 am Post subject: |
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| tlccomp wrote: |
My wife will be gone for a few days over the holidays and it would be a good time to try it |
LOL
Do not dissolve your home  |
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andamus
Joined: 06 Dec 2004
Posts: 1029
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| Posted: Mon Dec 22, 2008 8:32 am Post subject: |
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| tlccomp wrote: | | donutty wrote: |
I'll have to post some pictures of before and after... |
Interesting. Some before and after pictures would be nice.
My wife will be gone for a few days over the holidays and it would be a good time to try it |
Reminds me when I tried do desolder some chips from a a board using the oven in the kitchen , and my girlfriend returned back earlier that usual .... |
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Mon Dec 22, 2008 8:45 am Post subject: |
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| andamus wrote: | | Reminds me when I tried do desolder some chips from a a board using the oven in the kitchen , and my girlfriend returned back earlier that usual .... |
Was she at least happy to see you TRY to cook? 
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andamus
Joined: 06 Dec 2004
Posts: 1029
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| Posted: Mon Dec 22, 2008 9:34 am Post subject: |
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| debs3759 wrote: | | andamus wrote: | | Reminds me when I tried do desolder some chips from a a board using the oven in the kitchen , and my girlfriend returned back earlier that usual .... |
Was she at least happy to see you TRY to cook? |
 sorry debs but I clean the home, use the washmachine, and yesterday I've cooked a realy good "rice with red radicchio (don't' know how to translate) and sausage" |
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donutty
Joined: 16 Feb 2008
Posts: 1122
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| Posted: Mon Dec 22, 2008 9:46 am Post subject: |
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I'll prepare some before and after photos and method this evening. I am using 38% conc. HCl (fumes appear when you open the bottle). I don't know what strength you can get where you are in the world, but lower concentration will probably just take longer. Be careful not to breathe the vapour, get any in your eyes; and wear goggles (of course I am obliged to make this safety announcement. Just the same as we all wear goggles and use a fume extractor when soldering; right?).
If I can figure out a way, I might do a time-lapse video of the stuff 'in action' |
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Windmiller
Joined: 24 Jun 2005
Posts: 1716
Location: Chapel Hill, NC
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| Posted: Mon Dec 22, 2008 9:50 am Post subject: |
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Cant wait to see pics!!! If any US collectors finds a source for this stuff post it.
Last edited by Windmiller on Mon Dec 22, 2008 10:00 am; edited 1 time in total |
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