Rust forming on a corner seam of a steel pergola post…
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Rust forming on a corner seam of a steel pergola post - best repair sequence?
I've got a bioclimatic pergola in my backyard, and on one of the posts the powder coating has cracked open right along a vertical corner seam, exposing bare metal that's now rusting (pics attached). I'm fairly sure the post is powder-coated steel rather than aluminum, and the corner is probably the weak point since the coating is thinnest there and it takes the most mechanical stress.
This is recent and it's getting worse. It rained heavily yesterday, so I'm worried there's already moisture trapped in there working on it.
My plan was:
1. let it dry out completely
2. wire brush / sand back to bare metal
3. rust converter (tannic acid based) for the spots inside the seam I can't mechanically reach well
4. rust-inhibiting primer, then matching topcoat (light grey/white RAL)
Does that sequence make sense, or am I missing a step? Also - until I have time to do the full job properly, is it smarter to seal the gap temporarily (butyl tape, clear silicone) to keep more water out, or would that risk trapping moisture in and making the corrosion worse in the meantime?
Appreciate any input from people who've dealt with corrosion on coated steel outdoor structures.
https://preview.redd.it/90lg8pyrfdah1.jpg?width=1280&format=pjpg&auto=webp&s=5e0a158f77f586298e73da601bbebf0ffda7a503
https://preview.redd.it/nhup7pyrfdah1.jpg?width=1280&format=pjpg&auto=webp&s=35f6340bdfb0d145ef31bdd0c870f6ca702f7522
https://preview.redd.it/k0zhroyrfdah1.jpg?width=1280&format=pjpg&auto=webp&s=8699d4b54d4c1c7f4353836cca3461f41ddbb29b
#industry
source
I've got a bioclimatic pergola in my backyard, and on one of the posts the powder coating has cracked open right along a vertical corner seam, exposing bare metal that's now rusting (pics attached). I'm fairly sure the post is powder-coated steel rather than aluminum, and the corner is probably the weak point since the coating is thinnest there and it takes the most mechanical stress.
This is recent and it's getting worse. It rained heavily yesterday, so I'm worried there's already moisture trapped in there working on it.
My plan was:
1. let it dry out completely
2. wire brush / sand back to bare metal
3. rust converter (tannic acid based) for the spots inside the seam I can't mechanically reach well
4. rust-inhibiting primer, then matching topcoat (light grey/white RAL)
Does that sequence make sense, or am I missing a step? Also - until I have time to do the full job properly, is it smarter to seal the gap temporarily (butyl tape, clear silicone) to keep more water out, or would that risk trapping moisture in and making the corrosion worse in the meantime?
Appreciate any input from people who've dealt with corrosion on coated steel outdoor structures.
https://preview.redd.it/90lg8pyrfdah1.jpg?width=1280&format=pjpg&auto=webp&s=5e0a158f77f586298e73da601bbebf0ffda7a503
https://preview.redd.it/nhup7pyrfdah1.jpg?width=1280&format=pjpg&auto=webp&s=35f6340bdfb0d145ef31bdd0c870f6ca702f7522
https://preview.redd.it/k0zhroyrfdah1.jpg?width=1280&format=pjpg&auto=webp&s=8699d4b54d4c1c7f4353836cca3461f41ddbb29b
#industry
source
| 4,000 mlx | |
| 5 | |
| 0 |