Opinions on corrosion?

[n86121]

I'm not an AI, but it looks ugly but superficial to me.

My limited knowledge comes from owning 84 alfa spider that I had restored, and a boat.

Thing to do would be to have someone knowledgeable treat it.

My guess, blast it with soft something: Bead, glass, walnut, and other odd things used by experts.

Clean / expose it and see what's there. Then seal/treat.

Those areas also don't appear to be heavily loaded structural items.