User blog comment:IamJakuhoRaikoben/Chapter 273: Orga of the Black Lightning, Review./@comment-1732320-20120303144846/@comment-3987368-20120303152532

No, the two are pretty different.

Ironic is the opposite way to what is expected, thus causing wry amusement.

Sarcasm is a form of wit that is marked by the use of language intended to make its victim the butt of contempt or ridicule.

Though to be more specific, sarcasm can employ irony but 'ironic' and 'sarcastic' aren't typically interchangeable.