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Thread: How Do You Prevent Flash Rust?

  1. #1
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    How Do You Prevent Flash Rust?

    I have a few hundred pounds of parts I'm going to clean up and then take to the cad plater. What is the best way to prevent flash rust on newly bead blasted and cleaned parts? It's going to take me a couple weeks to get these parts so ready, so there will be some lag between cleaning and plating.
    Moon Wolf

    Possessor of many parts that used to be Harley Davidson Motorcycles and someday soon will be again, including a 1957 XL, 1961 XLH, 1962 XLH, 1965 XLH, 1968 XLH...

  2. #2
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    Re: How Do You Prevent Flash Rust?

    I've got some parts that have been bead blasted for over a year, show very little or no flash rust. I have them stored in the basement; we have forced-air heat, which I believe is very low in humidity. Other than that, I can't help ya...
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  3. #3
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    Re: How Do You Prevent Flash Rust?

    My Gunsmith told me to spray with LPS2 and then cover in a bucket all my beadblasted parts that where waiting for him to get enough to do a larger batch of parts to gun blue. He said that LPS2 would clean right off with the cleaner he used. I've done it ever since.

    But perhaps call the cad plater and ask them what they recommend.
    Last edited by tomcat1; 02-01-2011 at 08:18 PM.
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  4. #4
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    Re: How Do You Prevent Flash Rust?

    If the parts are small, I use a vacuum food storage bag system. It was not cheap, and the bags are not either. After a while you learn just how long to cut them and fit in the heat seal area. I can split the bags in 3 pieces lengthway too.
    I have a friend at a shoe store, imported shoes are shipped with a desiccant packet in each box. For extra protection I toss a packet in with a part before I seal it. Not pieces that are going to be plated, but some I spray with WD-40 before sealing.
    drinner

  5. #5
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    Re: How Do You Prevent Flash Rust?

    I should have mentioned some of the parts will be cleaned in muriatc acid, and they will definitely flash rust.
    Moon Wolf

    Possessor of many parts that used to be Harley Davidson Motorcycles and someday soon will be again, including a 1957 XL, 1961 XLH, 1962 XLH, 1965 XLH, 1968 XLH...

  6. #6
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    Re: How Do You Prevent Flash Rust?

    You need to run the parts through a soda bath after the acid and then dry them.
    Is there someone in Seattle still doing cad? I had mine done in Monroe three years
    ago but I here all they do now is zink.
    UPSROD

  7. #7

    Re: How Do You Prevent Flash Rust?

    The Cad plater will most likely strip them anyway. So don't lose sleep over it.
    Chris Haynes
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  8. #8
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    Re: How Do You Prevent Flash Rust?

    A wipedown with phosporic acid etch (used for prepping steel prior to paint) should not only remove any light rust but provide some anti-rust protection. I don't know how this would affect cad plating. I think Chris Haynes is probably correct: a good plater will make sure the material is prepared right before he does his work.

    Walt
    32V4191

  9. #9
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    Re: How Do You Prevent Flash Rust?

    Quote Originally Posted by ups View Post
    You need to run the parts through a soda bath after the acid and then dry them.
    Is there someone in Seattle still doing cad? I had mine done in Monroe three years
    ago but I here all they do now is zink.
    I had a place in Portland do some parts, but Steve White gave me the number of a outfit in Anacortes. Their prices seem reasonable and I saw the stuff they did for Steve and liked the look. They don't appear to use as many brighteners as some places nowadays. I'm going to give them a try.

    Chris--Steve got a good price, but I believe that was because he did the prep. He recommended that I strip and clean the parts myself.
    Last edited by moonwolf; 02-02-2011 at 07:47 AM.
    Moon Wolf

    Possessor of many parts that used to be Harley Davidson Motorcycles and someday soon will be again, including a 1957 XL, 1961 XLH, 1962 XLH, 1965 XLH, 1968 XLH...

  10. #10

    Re: How Do You Prevent Flash Rust?

    Chris is right. Just pour kerosene over them. The plater will clean it with a chemical before he plates it!

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