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Walther Cp99 Corrosion...?

Discussion in 'Technical' started by Boris2730, Mar 22, 2020.

  1. Boris2730

    Boris2730 Member

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    Hello,
    Would like to kindly ask for a help guys.
    I own Walther CP99 for about 10 years now, never had a problem with it.
    Used it last time some 5 months ago but took it out yesterday and looks like the gun developed some sort of pitting corrosion or something, I've never seen it before. It does not function anymore as the trigger is stuck.
    Looks like it's mostly on the aluminium parts.
    Does anyone knows whether the gun is a write off please? If not, how or what to use to clean it?
    Please note that it sat in my draw under room temperature whole life so storage should not have been a problem, I think.
    Any sensible answers would be very much appreciated as would be REALLY SAD to see it go as until now it has been awesome.
    Many thanks,
    Boris
    20200321_192717.jpg 20200321_192741.jpg 20200321_192907.jpg
     
  2. Bezzer

    Bezzer Posting Addict

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    That's bad, can't see any way back from that, is it alloy or monkey metal? I keep loads of alloy of different types and shapes in the shed, there'll be offcuts way more than 10 years old and nothing ever looks anywhere like that bad. Strip it for any useable parts and scrap the rest.
    Anything else in the drawer that may have caused that bad an oxidisation?.
     
  3. Boris2730

    Boris2730 Member

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    Thank you for your reply Bezzer.
    No there's nothing in the drawer I can think of that may have cause this, no liquids, acids etc.
    At first I thought it was just a powder, but it's not, literally could not even open the slider at first.. :(
     
  4. owain glyndwr

    owain glyndwr Posting Addict

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    i think it's called oxidation,forgot to clean a fishing reel once,and a few weeks later it looked like that.did you store it wet?
     
  5. Bezzer

    Bezzer Posting Addict

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    Weird that then, strong alkaline substances, caustic soda, drain cleaners and the like, are the main reactors with aluminium alloys that could cause such oxidisation in a relatively short length of time, moisture/damp would take a fair while to get that bad.
     
  6. Boris2730

    Boris2730 Member

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    Hi Owain, no I did not store it wet, been sat in my draw under room temperature.
     
  7. garryt

    garryt Posting Addict

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    They're made from cast zinc alloy, with about 10% aluminium content.
    Have you tried cleaning any off and see what it's like underneath?
    Depends where any pitting is, and how deep as to whether it'll affect operation and performance.
    From the pics it may be salvageable.
     
  8. Sarge

    Sarge Keyboard Hero

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    Use a tooth brush with some to remove it and see what it looks like, can you take it apart? A light coating of oil may help but until it is removed it'll be difficult to make any suggestions past the removal.
     
    garryt likes this.
  9. Boris2730

    Boris2730 Member

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    I've not tried to clean it off yet but did put WD40 all over but it did not have any effect, neither did it loosen up parts.
    Don't know how, but will try to disassemble and clean it somehow, although agree that if it won't operate at least close to how it was before, then there's no point saving it. Many thanks for all your responses guys, very much appreciated.
     
  10. CaptDAR

    CaptDAR Always count your shots and your adversary’s

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    This is the video I used when I stripped and repaired mine.

     
    Boris2730 likes this.
  11. Boris2730

    Boris2730 Member

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    Hi guys,
    Thank you for all your answers. Finally forced myself to disassemble the gun as shown on the video from CaptDAR above, scrapped, sanded, rubbed, cleaned and WD40'd absolutely everything as best as I could and the gun seems to be working again. I did need a bit of persuasion and raw muscle power, especially the magazine extraction mechanism, but in terms of gun operation and FPS power in the end I think I'm say 90% where it has been before. Don't think this will last years and years even with good maintenance as some of the parts are pretty badly oxidized / corroded, but I'm very happy with final result as I never striped the gun before. Once again many thanks.
     
    no country members and CaptDAR like this.

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