Closest you'll get to Iron Man is probably an Energy/Invuln Sentinel or an Energy/* Blaster. Sent Ancillary and Patron pools don't really fit an Iron Man archetype.
Energy/Energy Blaster could fit. Although, my favorite secondary for Blasters is Temporal Manipulation because it's more low-key while being very useful. And it can fit basically any kind of character depending on which powers you take. For example, I made a Dark/Temp Blaster. Basically everything in the set fits. However, on my Fire/Temp Blaster, I don't feel like the attacks in the set mesh, on top of the fact that fire's damage output is high enough without needing help... so I ignored all the attacks.
Blasters have the additional benefit of having a couple of Ancillary Pools that can fit an Iron Man type character. Force Mastery, for example has force fields and Temp Invuln. Arsenal Mastery has a passive smash/lethal res and a single target debuff called Surveillance. Arsenal Also has gadgets like Cryo Freeze Ray, LRM Rocket, and Sleep Grenade, but they're not "built in" like Iron Man's stuff is. Your character pulls stuff out of hammer space to use the attacks.