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  1. #1
    Join Date
    Nov 2005
    Posts
    22

    Question How to remove discoloration from heat?

    I need to figure out how to remove the discoloration the heat from welding stainless steel produces. I'm using 20GA brushed or mirror finish so I need a solution that doesn't involve abrasives, etc. Possibly an acid I could immerse the part in? Pictures below showing the blue/gold color. Thanks for any help!






  2. #2
    Join Date
    Dec 2007
    Posts
    16

    Smile passivation

    passivation is the removal of exogenous iron or iron compounds from the surface of stainless steel by means of a chemical dissolution,most typically by a treatment with an acid solution that will remove the surface contamination but will not affect the stainless steel parts where i work we have a machine that we ground to the welded part then there is a hand held part that you slide a sock type cotton over and put in the acid solution and rub across the welds and it looks like new when done i hope this has helped.

  3. #3
    Join Date
    Nov 2005
    Posts
    22

    Default

    Quote Originally Posted by brian View Post
    passivation is the removal of exogenous iron or iron compounds from the surface of stainless steel by means of a chemical dissolution,most typically by a treatment with an acid solution that will remove the surface contamination but will not affect the stainless steel parts where i work we have a machine that we ground to the welded part then there is a hand held part that you slide a sock type cotton over and put in the acid solution and rub across the welds and it looks like new when done i hope this has helped.
    Any specific brand names or machine names I can look up? I've heard you can weld the part in a fully saturated container of Argon, but that's not practical for my needs. I'm really looking for something like you explained...

  4. #4
    Join Date
    Apr 2007
    Location
    Ventura, California
    Posts
    102

    Default Try Surfox

    Quote Originally Posted by toofazt View Post
    Any specific brand names or machine names I can look up? I've heard you can weld the part in a fully saturated container of Argon, but that's not practical for my needs. I'm really looking for something like you explained...
    Walter makes a line of equipment called Surfox. They aren't cheap (expect to be set back about $1500 ), but they do work well.

    http://www.industrialtool.com/prodde...sp?prod=Surfox
    Dynasty 200 DX
    Coolmate 3

  5. #5
    Join Date
    Nov 2005
    Posts
    22

    Default

    Thanks for the link Dave.

    Some interesting info on the topic can also be found here:

    http://www.azom.com/details.asp?ArticleID=1142

    http://www.avestafinishing.com/pages/Page____517.aspx
    Last edited by toofazt; 12-21-2007 at 02:31 AM.

  6. #6
    Join Date
    Mar 2007
    Posts
    356

    Default

    go to your local welding shop or gas supplier and ask for pickling paste, directions are on the side of the container
    mm210
    maxstar 150

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