Are you sure that it's paint and not powder coated (what pipe work usually is)
Aluminum structures on boats are either anodized, painted or powder coated, mostly powder coated but not anodized and then painted or powder coated. Outboard lower units are made of a aluminum alloy and they are painted
Anodized aluminum pipes for hard tops is 98% silver coloured (but can have many other colours) as boat structures were some time ago and it's the most durable protection available, paint and powder coating can be of any color available.
You should fix that asap and by a professional to avoid that in a few years the damaged area will bubble and the powder coat flaking off.
The non treated aluminum must be totally freed of any white aluminum oxide powder (including the ones in scratches, dings and nicks) and sanded a patch around the affected places. Then the correct primer (zink-chromate) must be immediately applied and once dried painted with the paint of your choice. Best would be Awlgrip tinted to the GW color of the pipework. Follow absolutely any paint instructions and don't use any metallic wire brushes, only plastic composite ones.
If the structure is powder coated (what i guess) then same as above applies, but patch around the damaged space should be bigger.
I strongly suggest you to have this done by a professional to avoid that your hardtop looks very ugly in a few years.
If you post some photos of the damage we would have a better idea what is used as protection and how to repair.
Chris