Powder coating is very tough, but be sure to use a powder coater who primes the bare metal with phosphate primer before applying the powder coating.
Not all p/coating firms do this, and that's why you see so many p/coated items where the surface may have been chipped and corrosion has spread under the rest of the coating.
Virtually all mass-produced brackets and small metal items are powder coated directly on to bare metal. They look great until the surface is damaged in any way, then corrosion sets-in. This can go unnoticed for a long time due to the toughness of the coating, but it causes a lot of damage to the underlying metal.