Minion critical strike chance

Although we don't have any tool tip or display to show the zombie/skeleton critical chance, If I wield any global critical chance gears like diamond ring or dagger, I visualized freeze,burn on monsters more frequently, also the monster gains power charge quickly If I put the support gem and more frequently.

If I remove the gears and rings then the zombie gains power charge very slowly after lot of hits

Can we go for all the global critical chance near shadow and scion to do a minion critical damage build??

minions are different entities who use their own stats and skills. Therefore your modifiers from gear and passive tree has no effect on them (unless they clearly state "minion").

base crit of zombies, skeletons and spirits is 5%. Their crit chance can be increased with support gems or with assassins mark curse on enemies