Results 1 to 6 of 6

Thread: Etching on a Mass Scale

  1. #1
    Join Date
    Jul 2015
    Posts
    6
    Post Thanks / Like

    Etching on a Mass Scale

    Hello,

    I work for a manufacturing company that does a lot of mig welding and am trying to figure out a way I can etch welds on a larger scale than one at a time. As of now we are using nitric acid and q-tips to clean and bring out the welding metal. I was told that using a 3 bath system (1st bath nitric acid (30%) 2nd bath water, 3rd bath ethanol) would allow me to etch several pieces at a time, but am having trouble with the pieces rusting up after a few minutes. Open to any ideas. Looking for something that will cut both the time it takes to etch the welds as well as something that will drastically increase the shelf life of the etched welds and protect them from rust.

    Thank you.

  2. #2
    Join Date
    Jan 2008
    Location
    Richmond, Virginia
    Posts
    7,065
    Post Thanks / Like

    Re: Etching on a Mass Scale

    You are not neutralizing the acid?
    "USMCPOP" First-born son: KIA Iraq 1/26/05
    Syncrowave 250 w/ Coolmate 3
    Dialarc 250, Idealarc 250
    SP-175 +
    Firepower TIG 160S (gave the TA 161 STL to the son)
    Lincwelder AC180C (1952)
    Victor & Smith O/A torches
    Miller spot welder

  3. #3
    Join Date
    Jul 2015
    Posts
    6
    Post Thanks / Like

    Re: Etching on a Mass Scale

    Isn't that what the water is doing?

  4. #4
    Join Date
    Oct 2007
    Location
    Yuba City, CA
    Posts
    1,676
    Post Thanks / Like

    Re: Etching on a Mass Scale

    Quote Originally Posted by cut&etch View Post
    Hello,

    I work for a manufacturing company that does a lot of mig welding and am trying to figure out a way I can etch welds on a larger scale than one at a time. As of now we are using nitric acid and q-tips to clean and bring out the welding metal. I was told that using a 3 bath system (1st bath nitric acid (30%) 2nd bath water, 3rd bath ethanol) would allow me to etch several pieces at a time, but am having trouble with the pieces rusting up after a few minutes. Open to any ideas. Looking for something that will cut both the time it takes to etch the welds as well as something that will drastically increase the shelf life of the etched welds and protect them from rust.

    Thank you.
    Apparently you're etching polished weld coupons for macro/micro exam?
    Blackbird

  5. #5
    Join Date
    May 2011
    Location
    Andover, Ohio
    Posts
    2,568
    Post Thanks / Like

    Re: Etching on a Mass Scale

    Welcome to the forum.
    Lincoln A/C 225
    Everlast P/A 200

  6. #6
    Join Date
    Jan 2008
    Location
    Richmond, Virginia
    Posts
    7,065
    Post Thanks / Like

    Re: Etching on a Mass Scale

    Water and ethanol won't neutralize any remaining acid, just dilute it. Wouldn't hurt to try some sodium carbonate (washing soda) or sodium bicarbonate (baking soda) in the second bath, then water, then the ethanol. Not sure of the reason for the ethanol except reducing the remaining moisture.

    To preserve the samples, either coat them with something or keep them in a very low humidity environment above room temperature.
    "USMCPOP" First-born son: KIA Iraq 1/26/05
    Syncrowave 250 w/ Coolmate 3
    Dialarc 250, Idealarc 250
    SP-175 +
    Firepower TIG 160S (gave the TA 161 STL to the son)
    Lincwelder AC180C (1952)
    Victor & Smith O/A torches
    Miller spot welder

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Page generated in 1,627,735,933.75668 seconds with 13 queries