Talk:Damage 2.0/Corrosive Damage/@comment-63.230.18.117-20140310054904

Based on testing I've done so far, the corrosive proc seems to reduce the target's armor to around 75% of its original value. So in other words:

[Reduced armor] = .75 * [Original armor]

Also, the proc does stack multiplicatively; each time the proc is re-applied, it applies the .75 multiplier to whatever the target's new armor is. Thus, if you were to, for instance, apply a corrosive proc to an enemy 5 times, their new armor value would be .75^5 = .237 times their original armor value.

However, against alloy-armor enemies, if you're choosing between corrosive and radiation for your main damage dealing weapon, radiation is still usually going to be a better choice, since it already innately treats the target's armor as having a .25 multiplier AND gains 1.75x bonus damage against them. (see https://forums.warframe.com/index.php?/topic/134007-warframe-powers-post-u12/?view=findpost&p=1762321 )

However, if you bring along a weapon capable of quickly and repeatedly procing corrosive onto alloy-armor enemies (such as Tysis or Grakata) then switch to a radiation weapon to deal out the main damage, it could be a devastating combo. Of course, then it's up to you to decide whether it's worth the time to switch weapons, pop off a few shots, then switch back instead of just unloading your main weapon for that amount of time.

There's also the option of putting both radiation and corrosive onto certain innate-element weapons (i.e. Stug, Tysis, Detron) to be able to proc corrosive AND deal bonus damage to both types of armor. Stug in particular can be an incredibly effective anti-grineer weapon due to its high damage and ability to proc corrosive in an AOE with its explosions.