Roger Shoaf wrote:
From time to time I find it desirable to weld something that has been
galvanized. This has required grinding off the zinc.

If I was to get one of those do it yourself zinc plating kits, could I just
reverse polarity and de-zinc the iron?

I recently dunked some old galvanized caster bodies into hot lye and left
them overnight. It both removed the zinc and chemically reduced the rust.
Clean, unplated parts, ready to weld and then paint. - GWE