We are going to weld stable fittings in steel that need to withstand a certain amount of ammonia and moisture. My husband does not want to weld stainless steel, and there doesn't seem to be anyone who can galvanize the steel in the city where we live (Umeå).

What are the alternatives for protecting the steel?

And if I may have a preference, I would like the steel to be black.
 
Claes Sörmland
Isotrol primer and then a black topcoat for steel on it in a couple of layers. Acrylic-based topcoat so it withstands ammonia.

When you get damage to the paint surface and rust spots, you can touch up with Isotrol primer. It can be painted on rust.
 
Look for a color system that meets corrosivity class C4.
 
Thank you for your answers! Then I have some options :)
 
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