Best way to remove galvanizing from mild steel
Best way to remove galvanizing from mild steel
(OP)
Hi
Could anybody perhaps shed some light on what is the correct procedure to follow to remove existing galvanizing from mild steel so as to have it properly re-galvanized?
Thanks
Could anybody perhaps shed some light on what is the correct procedure to follow to remove existing galvanizing from mild steel so as to have it properly re-galvanized?
Thanks





RE: Best way to remove galvanizing from mild steel
RE: Best way to remove galvanizing from mild steel
Also - please request this thread be deleted so you won't get nailed for double posting.
RE: Best way to remove galvanizing from mild steel
RE: Best way to remove galvanizing from mild steel
RE: Best way to remove galvanizing from mild steel
Why remove it before hand. If it is dipped in molten zinc, the original coating should melt and mix with the bath.
Regards
Pat
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RE: Best way to remove galvanizing from mild steel
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RE: Best way to remove galvanizing from mild steel
30" in the air sounds well ventilated
Regards
Pat
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RE: Best way to remove galvanizing from mild steel
"Why remove it before hand. If it is dipped in molten zinc, the original coating should melt and mix with the bath."
Sometimes the reason for removing Galvanised before re coating is because the metal was not properly prepped before dipping. The resultant coating does not adhere very well to the parent metal and peels later.
Re dipping does not cure that problem.
B.E.
RE: Best way to remove galvanizing from mild steel
welding over zinc can lead to liquid metal embrtllement, as the zinc will penetrate in the metal in the haz.
Seen this in a case where they forgot to normalize a zinc-plated object prior to galvanizing, and decided to do this afterwards.
The hydrochloric acid, with the necessary precautions, would do the trick, but personnaly I would have it done by a more experienced company because of the health risks involved.
RE: Best way to remove galvanizing from mild steel
If it could be dismantled, for welding I might treat with inhibited hydrochloric acid and or grind the area, depending on quality requirements and size of job and size of weld and stress on the joint.
The OP does not specify why it if faulty, but if the problem was actually faulty pretreatment,then obviously a pickling/proper pretreatment process would be better.
Regards
Pat
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RE: Best way to remove galvanizing from mild steel
RE: Best way to remove galvanizing from mild steel
_____________________________________
I have been called "A storehouse of worthless information" many times.
RE: Best way to remove galvanizing from mild steel
RE: Best way to remove galvanizing from mild steel
You can do local repairs at the weld by wiping the weld with a rod of zinc while the area is still hot enough to melt the zinc, but not hot enough to burn it. A poorer treatment is zinc rich paint.
Regards
Pat
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