cutting edges of Q500NH weathering steel after cutting, despite its inherent corrosion resistance. Here's why and how to handle it:
1. Why Treat Cutting Edges?
:
Cutting removes the protective oxidized layer (patina), exposing bare steel vulnerable to initial rust.
:
Untreated edges may corrode faster than the patinated surface, creating uneven degradation.
2. Recommended Treatments
Short-termweathering-resistant primer (e.g., zinc-rich paint) to edges until natural patina reforms (~6–12 months).
Long-termpatina-accelerating sprays (e.g., ammonium chloride solution) to speed up oxidation.
3. When Can You Skip Treatment?
(e.g., by plates or sealants).
low-corrosion environments (dry inland climates).
: For critical structures (bridges, facades), always treat edges to ensure uniform corrosion resistance.
