Mix ammonia and water and you end up with ammonium hydroxide, a fairly strong caustic solution that eats brass and copper.
Anhydrous ammonia (dry, all moisture removed) has no effect.
But of course, ammonia attracts water out of the air like flypaper so you've got an instant problem.
Your link does make it sound like having ammonia present during the drawing process (like sizing) is a very bad thing. Personally, that's enough to convince me to avoid it.
Thanks.
Quote:Even in very low concentrations of ammonia, brass that is stressed by either residual or applied tension will spontaneously crack by 'stress corrosion', a phenomenon first observed many years ago and at that time called 'season cracking'... For failure to occur in this way, two conditions must apply: that the brass is under stress, and that ammonia is present Internal tensile stresses caused by cold working, as in the cold drawing of tubes or cold bending of pipework, are sufficient to make brass susceptible to stress-corrosion cracking.