Green’s Dictionary of Slang

(US black) unappealing, unattractive.

1980		E. Folb Runnin’ Down Some Lines 148: Females, like males, talked about undesirable men in terms of being physically unattractive (raspy, [...] corroded).
1995		L. Stavsky et al. A2Z 23/2: corroded – adj. of poor quality. This track is corroded.