Basics

The process of coating a metal (Typically Steel) in Zinc
Typically done at Factory Scale, but may be possibly at a large scale/capability level Microfactory / Makerspace etc
As Stated in Metal Protective Coating Epoxy or Composite Coatings may work as well if applied properly (Needs More Research)
Also Cathodic Protection fills a similar role, yet is easily maintainable

Types

Triple Zinc, ZMAX, or G185 is what we want for exterior applications with treated lumber.
G90, U26 joist hangers - not what we want for treated exterior.
2x6 G185 - [1]
JUS26-TZ - triple zinc 2x6 joist hanger part numbers from mitek [2]
JUS26-GC is gold coat - a polymer coat on top of the galvanized for more protection [3]
LUS ZMAX by Simpson is good