Why Wire Mesh Rusts and How to Prevent It

Wire mesh rusts when the zinc coating (galvanizing) is compromised and the underlying steel is exposed to moisture and oxygen. Common causes of premature rusting: thin zinc coating (electro-galvanized rather than hot-dip), cutting without treating cut edges (cut edges expose bare steel - treat with cold galvanizing paint), coastal salt air (accelerates zinc corrosion significantly), animal waste (ammonia in poultry environments dissolves zinc rapidly), constant water contact (pond, drainage, rain exposure). Prevention: always specify hot-dip GI not electro-galvanized, treat cut edges with zinc-rich cold galvanizing spray, use PVC coated mesh for aquaculture and high-humidity environments, use SS304 or SS316 mesh for coastal or highly corrosive environments. Replacing rusted mesh with the correct specification product for the environment eliminates premature replacement cycles.