What does corrosive mean?

You are correct!

From our dictionary:

cor•ro•sive

Pronunciation: (ku-rO'siv), [key]
adj.
1. having the quality of corroding or eating away; erosive.
2. harmful or destructive; deleterious: the corrosive effect of poverty on their marriage.
3. sharply sarcastic; caustic: corrosive comments on the speaker's integrity.

n.
something corrosive, as an acid or drug.