Corroded Steel Angles

[ron9876]

I have an unusual condition that I have to solve. Worked on an existing hollowcore building several years ago. Major renovation where the exterior walls were removed and new exterior walls, balconies, etc were added. I supported some of the planks on a heavy shelf angle that was attached to a new beam with studs. The project stopped for a several years and water got into the vertical joint between ends of the planks and the angle. Some corrosion on the exposed horizontal face of the shelf angle. Cleaned up nicely but the vertical face and the upper face of the horizontal leg of the angle have some corrosion. I have some slop in the design so it looks like the angle should be ok but can't get to the other surfaces to clean and coat. Looking for a good idea to treat that those surfaces. Used Osfo (?) to treat some steel once but not sure about using in an interior condition. Any ideas?

 

[apsix]

I don't see the need for any treatment IF the angles will be in a dry, interior environment once the building is finished.

If that's not the case I would contact a reputable paint/surface treatment supplier to see what's on the market.

 

[hokie66]

Agree with apsix. If it is inside, you can leave it. If subject to further corrosion, no solution is feasible without access for preparation and coating.

 

[BAretired]

I tend to agree with apsix. If the environment is always going to be dry, paint or other corrosion protection is not necessary.

BA

 

[apsix]

In marine and automotive applications products using lanolin and/or fish oil are used. These can have good wicking ability and usually don't require surface preparation.

 

[racookpe1978]

I understand phosphoric acid "converts" rust to a non-eroding condition. That would stop the existing rust from continuing in the inside (impossible to reach) places, and a cover coat of primer + overcoat would prevent further corrosion inside.

But, would the acid add to corrosion acceleration elsewhere?

 

[asixth]

Did the angle have a protective coating originally?.