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Rust and Corrosion on Metal Fences
in McKinney, TX
Iron and chain link fences in McKinney deal with high humidity for about 8 months of the year. Add irrigation systems that spray the fence twice a day and you have a fence that is wet more often than it is dry. Most ornamental iron fences start showing rust within 5 to 8 years if the original paint gets chipped and is not touched up. Chain link corrodes fastest at the bottom where it sits close to the soil.
Quick Answer
Metal fences rust faster in McKinney than people expect because the humidity here stays high through spring and fall, and sprinkler systems hit the metal every day. Surface rust can be treated and repainted if it has not eaten through the metal yet. Rust at welded joints or along the bottom rail is more serious because those spots are where the fence loses its strength. Check for soft spots before deciding on a repair versus replace.
Telltale Signs
Warning Signs to Watch For
- Orange or brown rust stains running down the fence from joints or welds
- Paint is bubbling, flaking, or peeling away from the metal surface
- The metal surface has pits or holes where rust has eaten through
- Welds at the corners or connections have rust bleeding out of them
- Chain link mesh has brown or orange discoloration and feels rough
- The bottom rail of a chain link fence is bent or collapsed from corrosion
Root Causes
What Causes Rust and Corrosion on Metal Fences?
Irrigation System Overspray
Sprinkler systems in McKinney yards run year-round for most homeowners and many heads are aimed at or spray past the fence line. Metal that gets wet and then dries in the Texas heat will rust faster than metal that stays dry. Irrigation water also carries minerals that deposit on the metal and trap moisture against the surface.
The Fix
Rust Treatment, Repainting, and Sprinkler Adjustment
We wire-brush the rust back to bare metal, treat the surface with a rust-converting primer, and apply an oil-based metal paint. Adjusting the sprinkler heads so they do not hit the fence directly is the only way to slow the rust from coming back.
Chipped Paint and Bare Metal Exposure
A metal fence is only as rust-proof as its paint coating. One chip from a lawnmower or a dog scratching at the fence exposes bare steel to the air. In McKinney's humid air, bare steel starts to rust within weeks. The rust then works under the surrounding paint and lifts it, so one small chip becomes a large rust patch fast.
The Fix
Spot Repair or Full Strip and Repaint
Small areas of rust are ground back to bare metal, primed, and painted to match. If rust covers more than about 30 percent of a section, stripping the whole section and repainting is more cost-effective than spot repairs that will not blend and will keep peeling.
Galvanic Corrosion at Mixed Metals
When steel hardware, like bolts or hinges, contacts aluminum or zinc-coated chain link, the two metals react with each other in the presence of moisture. This reaction is called galvanic corrosion, and it eats the metal faster than regular rust. McKinney installers sometimes mix metal types at gate hardware and fence post caps, and those spots corrode first.
The Fix
Hardware Replacement with Matched Metals
We remove the corroded hardware and replace it with fasteners and fittings made from the same metal as the fence. Where mixing metals is unavoidable, a non-conductive coating or nylon spacer between the two metals stops the reaction.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Irrigation System Overspray | Chipped Paint and Bare Metal Exposure | Galvanic Corrosion at Mixed Metals |
|---|---|---|---|
| Rust is heaviest on fence sections directly in the path of sprinkler heads | |||
| Rust starts at a visible chip or gouge in the paint and spreads outward | |||
| Rust appears only at bolt holes, hinges, or where two different metals touch | |||
| Paint is bubbling across a large area, not just at one spot | |||
| White or gray powdery deposits appear next to rust stains |
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