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Reddish brown corrosive stuff

Discussion in 'Troubleshooting and Repair' started by Kaylore, Jan 14, 2016.

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  1. Kaylore

    Kaylore

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    Jan 14, 2016
    There's been a few times I see this on circuit boards. My ps2 guitar hero controller ( a cordless guitar) it was acting up lagging and shorting out. So i took it apart the power wires detached from the circuit as I moved them gently. This reddish brown stuff has eaten the copper wires. The potentiometer failed for the same reason. Scraped it all off re-soldered and BAM!! Better than new. Question. What is this stuff?
     
  2. davenn

    davenn Moderator

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    show us a photo ....
    mite be either a glue to hold things in place or leaked guts from an electrolytic

    without seeing what you are referring to it's impossible to tell
     
  3. Merlin3189

    Merlin3189

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    I'd guess it was copper oxide, the result of corroding copper wire or PCB track.
    I think it is harmless and the significant thing you are removing when you clean it off, is the electrolyte which caused the corrosion. Electrolytes conduct electricity.

    I'm not sure of the chemistry behind this. Electrolytes usually come from leaking batteries. An electrolytic cell will dissolve copper at the anode, though I'd guess it would produce copper hydroxide or copper chloride, both of which are blue (and I have seen this as well as the red.) Perhaps they can further react with air to produce the oxide?

    Thinking again about it another possibility is that copper metal is re-deposited at the cathode. This is often an amorphous powdery deposit which would be brownish colour.
     
  4. Kaylore

    Kaylore

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    Jan 14, 2016
    I found this site as I was trying to figure this stuff out. Thanks got the replies. I thought of taking a photo before I started. It's too late now. I scraped it off and had to re-solder a lot of wires that connect to the board. I reassembled the cordless guitar. Calibrated it. The best it's ever been. I'm thinking it was some kind of glue. Or? The assembly plant was instructed to put that stuff on the connections knowing that it will corrode the wires in a few years. Cause most people are not like us. We fix shit if it breaks. Most would say oh well toss it in the trash and buy another one. And just maybe, the company can sell more that way
     
  5. Kaylore

    Kaylore

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    Jan 14, 2016
    image.jpg . I created this image at night in mid air. Anyone might know what it is? Just having fun.
     
  6. shrtrnd

    shrtrnd

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    My experience with a lot of the devices coming out of China is that the assemblers are in a hurry for piece-work. They just want to get the item done and tested, and out the door.
    To speed things up I've seen (maybe authorized, maybe just somebody just getting the job done), parts tacked in place so it will hold, so that the assembler can solder the wires or part in place.
    Quality control is virtually non-existent in a lot of these 'get 'er done' places.
    I would suspect the assembler used some sticky-stuff of some kind to hold the wires in place while they soldered the connections. The assembler was unconcerned about what might happen
    later, they just wanted to quickly do what they were being paid to do. Whatever the sticky 'tack in place' stuff was , just corroded the wires over time.
    No good guess on your photo. Smoke illuminated from behind maybe?
     
  7. Kaylore

    Kaylore

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    Jan 14, 2016
    Good guess. I've built and designed a few lasers and powered them up as much possible Trial and error I fried a few laser diodes. My son had lit a Roman candle and there was quite a bit of smoke so I activated the laser beam and used real fast back and forth swiping motion and the smoke contained those excited electrons which became photons long enough for me photograph it
     
  8. davenn

    davenn Moderator

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    electrons don't become photons
    you mean the laser just reflected off the smoke ?
     
  9. Kaylore

    Kaylore

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    Jan 14, 2016
    image.jpg
    This is what I was trying to explain. They don't become a photon they release one. I found this which explains it better. It's all Amazing to me. After I shut the laser off that green cloud just hovered and slowly disappeared. It looked like I created a temporary plasma field x
     
  10. shrtrnd

    shrtrnd

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    Not illumination of the unspent phosphorous from the expended munition?
     
    Bluejets likes this.
  11. davenn

    davenn Moderator

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    YES there's a big difference ;)
     
    Arouse1973 and Bluejets like this.
  12. Bluejets

    Bluejets

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    Saw a movie with a scene of a similar theme that ended something along the lines of "how do you like them apples"?o_O
     
  13. Kaylore

    Kaylore

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    Jan 14, 2016
    My son with the Roman candle. Or "munition". I like that word. He was at the other end of the driveway. Do steaks on the BBQ release phosphorus? I can produce a similar cloud at night from the smoke that comes from the BBQ. You guys really got me thinking on this now. The common factor is heat. The laser brings something to view out of the heat and smoke. Radiation. Infrared heat waves.
     
  14. Kaylore

    Kaylore

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    Jan 14, 2016
    With you smart guys I better start proof reading my sentences before I hit the reply button. I probably would of caught that then I wouldn't have felt the imbarrassment of making myself look dumb. This is a photo of my son illuminating phosphorous with a laser. Totally different from the munitions smoke image.jpg
     
  15. Arouse1973

    Arouse1973 Adam

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    The fact you actually know what a photon and electron are makes you not dumb :) how they interact can get quite complex.
    Adam
     
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