disintegrate vs wear away (at)

disintegrate

verb
  • To cause to break up into infinitesimal parts through the use of a disintegrator. 

  • To fall apart, break up into parts. 

  • To undo the integrity of, break into parts. 

wear away (at)

How often have the words disintegrate and wear away (at) occurred in a corpus of books? (source: Google Ngram Viewer )