rust that has formed on the iron fence is causing the paint to peel off, the fence is rusty.

rust iron fence paint peel formed causing deterioration corrosion metal oxidation surface flaking degradation weathering damage deteriorating rusting protective coating exposure elements erosion oxidization decay barrier rusted layer spots oxide rusty chemical reaction moisture stains process appearance particles corroded formation rustproofing inhibitor prevention remover rustresistant rustcolored texture rusty