Other signs of corrosion are:
Stains along the pillars, plinths, or other masonry surfaces in direct contact with the fence.
Cracks in the masonry the ironwork is attached to.
Sagging fence, squeaking or binding gates (corrosion can slightly weaken the structure causing it to bend a little).
If you are starting to see these signs of corrosion, it is very likely that your wrought iron fence is going to need to be repaired. This level of rust is generally a sign of a fence being neglected and is more likely to be seen on properties that haven’t been well treated. If you are buying a property with a wrought iron fence, do inspect the fence before closing. You might be able to get the seller to contribute to the cost of repairs.