I probably deserve some flack for being a bad/unobservant homeowner, but I recently noticed that several lintels were rusted along our entryway and the backdoor of our home (pictures in link below). Some of these look pretty bad to me, but I am not handy nor an engineer/construction guy so I wanted to get a general opinion from people more knowledgeable than me.

https://imgur.com/a/SMjyqRX

Is there a chance any/all of these can be repaired (e.g., remove rust, rustproof, paint)? Or has my lack of prevention now cost me several thousands to replace? This is a three story townhouse so there is a decent load above these areas; however, there are not currently any cracks in the surrounding brickwork that I can see. If more info or better pictures are needed, I can certainly provide that. I greatly appreciate your thoughts!

Sand and repaint

Agreed. Sand and paint.

Here is how I handle rusted lintels


Scrap loose rust
Go to McCoys or Sherwin Williams and purchase GEM or OSPHO
Apply GEM/OSPHO rust killer with a throw away brush
Let it dry over night and the rust will turn black

Apply a coat of this on them and let dry

https://www.lowes.com/pd/Zinsser-Cover-Stain-Interior-Exterior-High-Hiding-Oil-Based-Wall-and-Ceiling-Primer-Actual-Net-Contents-128-fl-oz/3609490


Apply 2 coats of your choice of finish paint.