Iron Reflexes

i have a question about the passive keystone "iron reflexes", i did some research and still cant find the answer to my question which is while the passive converts all evasion rating to armor and dex no longer provide evasion bonus, does that mean from now on dex will directly provide armor bonus instead? or dex will no longer provide any stats other than enabling the use of dex required eq and gems?

It means that dex will not provide any bonus to your armour or evasion. It will still provide accuracy.

I just tried it on an old character. Here is what happened.

Without Iron Reflexes:
Armour: 1585 20% reduction
Evasion: 1829 25% reduction

With Iron Reflexes:
Armour: 3357 35% reduction
Evasion: 0 5% reduction

Then I tried adding a +10 dexterity node and everything stayed the same. So your later assumption was right, all your evasion gets wiped out when you learn Iron Reflexes. But you keep the default 5% chance to evade.