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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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 Posted: Fri May 20, 2011 8:16 pm Post subject: |
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| susl45 wrote: | | thanks, but which kind of acid? and how the scale between acid and water? |
35% HCL Hydrochloric then dilute 1 part acid to 5 parts water
then using a open weave cloth apply to surface
leave a few minutes then wash off
if metal traces still present.. do again
just keep the acid away from any solder (like for die cap) as it will darken its colour
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susl45
Joined: 27 Dec 2007
Posts: 3179
Location: CHU
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| Posted: Fri May 20, 2011 8:37 pm Post subject: |
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| Neon_WA wrote: | | susl45 wrote: | | thanks, but which kind of acid? and how the scale between acid and water? |
35% HCL Hydrochloric then dilute 1 part acid to 5 parts water
then using a open weave cloth apply to surface
leave a few minutes then wash off
if metal traces still present.. do again
just keep the acid away from any solder (like for die cap) as it will darken its colour |
Thanks for info. normally I do not want to touch any acid including HCL etc.. because it is dangerous when kid around... , so I never try this, but maybe can try in future 
another question, how do you protect the printing on the vintage gold top chip, like 4004 4040 etc. specially for chips with some rust points already on gold top.
I tried with some kind of derusting solvent on some chips for test, so far there is no damage on the printing.
Do you have other good way?
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Fri May 20, 2011 8:59 pm Post subject: |
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very tricky if there is any rust points already
personally I wouldn't use any acid based products if the plating has started lifting
at best metho (denatured alcohol) just to give the chip some sort of cleaning.
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susl45
Joined: 27 Dec 2007
Posts: 3179
Location: CHU
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| Posted: Sat May 21, 2011 2:47 pm Post subject: |
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| Neon_WA wrote: | very tricky if there is any rust points already
personally I wouldn't use any acid based products if the plating has started lifting
at best metho (denatured alcohol) just to give the chip some sort of cleaning. |
Thx
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Katmai500
Joined: 30 Sep 2010
Posts: 360
Location: Southern NJ, USA
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| Posted: Wed May 25, 2011 4:18 pm Post subject: |
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I'd have to say that $20.56 USD was quite worth it for that chip. What a find! 
Congrats!  |
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Neon_WA
Joined: 08 Nov 2008
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Location: Margaret River, West Australia
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| Posted: Tue Sep 13, 2011 7:35 pm Post subject: |
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| susl45 wrote: | | Btw, how can you remove the scratches? |
Well I timed myself and the process of wiping down with dilute acid, washing, cleaning in denatured alcohol and blow drying chip
from this
to this took me under 4 minutes
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bccwchan
Joined: 20 Sep 2004
Posts: 2585
Location: Hong Kong
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| Posted: Tue Sep 13, 2011 8:05 pm Post subject: |
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| Awesome. It's magic. |
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susl45
Joined: 27 Dec 2007
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Location: CHU
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| Posted: Tue Sep 13, 2011 8:09 pm Post subject: |
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Wonderful joB！
I wonder whether the scratches were really removed totally or were just not showed on the photo.
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Neon_WA
Joined: 08 Nov 2008
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| Posted: Tue Sep 13, 2011 8:22 pm Post subject: |
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| susl45 wrote: | | I wonder whether the scratches were really removed totally or were just not showed on the photo. |
What ever marked the chip had only left a layer and not scrapped any of the ceramic away
Even in bright sunlight I cannot see where the marks were, but I have had chips where the marks don't show in photos but do still in bright sunlight
Until you remove the scrape layer, you won't know if marks will be still there or not
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susl45
Joined: 27 Dec 2007
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Location: CHU
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| Posted: Tue Sep 13, 2011 8:41 pm Post subject: |
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| Neon_WA wrote: | | susl45 wrote: | | I wonder whether the scratches were really removed totally or were just not showed on the photo. |
What ever marked the chip had only left a layer and not scrapped any of the ceramic away
Even in bright sunlight I cannot see where the marks were, but I have had chips where the marks don't show in photos but do still in bright sunlight
Until you remove the scrape layer, you won't know if marks will be still there or not |
Ok, this is what I want to know as I remember you said you have chips that marks don't show in photos but do still in bright sunlight
again, God job!
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Glory_Cloud
Joined: 24 Jul 2010
Posts: 2942
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| Posted: Wed Sep 14, 2011 7:12 am Post subject: |
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| Wow - you're the Wizard of Perth! |
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hugo929
Joined: 27 Oct 2006
Posts: 6163
Location: China
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| Posted: Wed Sep 14, 2011 7:21 am Post subject: |
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amazing work stu,
probably this is the correct way that IC dealers refurbish used chip into NOS state.
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gshv
Joined: 01 Feb 2003
Posts: 7898
Location: Fairfax, VA USA
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| Posted: Wed Sep 14, 2011 12:34 pm Post subject: |
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Impressive result. What dilute acid did you use?
Gennadiy
Last edited by gshv on Wed Sep 14, 2011 1:04 pm; edited 1 time in total |
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max3
Joined: 20 Feb 2010
Posts: 430
Location: DREAM LAND
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| Posted: Wed Sep 14, 2011 12:44 pm Post subject: |
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well done!
also would like to know what diluted acid did you use and what are the proportions?
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naked1300
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