Corvo scored 11 goals with 29 assists last year. He became available when the Hurricanes signed former Bruin Tomas Kaberle as a free agent.
A 6-foot-1, 210-pound defenseman, Corvo was originally drafted by the Kings in the fourth round of the 1997 draft.
Also Tuesday, Chiarelli said forward Milan Lucic had surgery to fix the cartilage in his nose, and backup goalie Tuukka Rask had arthroscopic surgery on the meniscus in his knee. Neither is expected to require a long recovery.
The Bruins also signed forwards Jamie Tardif and Josh Hennessy. Hennessy, a native of Brockton, Mass., who played 20 games for Ottawa from 2006-10, played for the Swiss club HC Lugano last season. Tardif spent the last two years in the AHL.