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Author Topic: Vinegar for galvanized removal  (Read 485 times)

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Offline LongTimeFordMan

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Vinegar for galvanized removal
« on: November 18, 2019, 11:31:54 AM »
Hi all..

As I mentioned in another post here I am redesigning the custom manifold I built awhile back to fit 2 SU sidedrafts to my 2.0 and am planning to use some 1 1/4 galvanized EMT conduit for runners.

Since its not advisable to weld galvanized i want to remove the zinc.

I have  been reading that vinegar can be used to etch off the zinc..

Has anyone had experience with this
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Offline Wittsend

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Re: Vinegar for galvanized removal
« Reply #1 on: November 18, 2019, 11:40:43 AM »
If not vinegar then likely phosphoric acid. But, even there you will have to likely lightly sand the surfaces if it works. Recently working on my Corvair I have used the washing soda and a sacrificial steel piece to transfer rust. I'm wondering if you could do the same to remove the galvanization???

Offline LongTimeFordMan

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Re: Vinegar for galvanized removal
« Reply #2 on: November 18, 2019, 11:46:31 AM »
I was thinking of using concentrated vinegar and adding some table salt to make hydrochloric  acid to speed up the process and maybe warming the solution a bit and placing it in the sun to keep it warm.

Ill give it a try and report back.
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Offline JoeBob

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Re: Vinegar for galvanized removal
« Reply #3 on: November 18, 2019, 02:42:33 PM »
If you see white powder on your weld there is still zinc present.   
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Offline Wittsend

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Re: Vinegar for galvanized removal
« Reply #4 on: November 19, 2019, 11:40:10 AM »
And, isn't it interesting that the "Weld Thru Primers" as far as I know contain zinc. Go figure.