Māori located it really really hard to acquire muskets given that the missionaries refused to trade them or promote powder or shot. The Ngāpuhi put missionaries underneath intense pressure to restore muskets even from time to time threatening them with violence. Galvanized rebar (ASTM 1094) is another option for corrosion https://totalbookmarking.com/story13635099/rumored-buzz-on-reo-steel-sydney