In a nutshell, the main difference between these two types of surface finish is the oxide layer. Anodized finish has a layer of oxide, whereas mill finish does not have the oxide layer.


Wrought iron: It is made from the raw element of iron. Professional workmanship with hammer marks and other signs of blacksmith techniques. Wrought iron will bend under extreme heat and does not dent, dimple, or collapse.

2) Aluminum color
Durable and Weather-Resistant
One of the most frequent questions I get as a fence designer is whether to install either a wrought iron or aluminum fence. Both are great fencing materials and both will do the job of providing a highly secure perimeter for your home or commercial property. However, there are some distinct differences between the two fence materials worth considering before making a final decision. I hope that this explanation of their differences will help!
Thickness
Aluminum profiles are mainly the product of the aluminum extrusion process, where an aluminum billet is passed through a die. The result — varying types of aluminum profiles that have wide uses across residential, industrial, and constructional spaces.