The best replacement for corporate bonds is municipal bonds.

The best alternatives to corporate bonds are rated as following:
★★★★★  municipal bonds
★★★★★  treasury bonds
★★★★★  government bonds
★★★  notes
★★  preferred stock
★★  us treasury bonds
★★  commercial paper
★  gilts
★  common stock
★  preferred stocks
★  treasuries
★  preferred shares
★  convertible bonds
★  equities
★  loans
  municipal
  dividend stocks

Your alternative for corporate bonds is not listed? Suggest!
Speaking about corporate bonds, one probably shouldn't forget about death put.

Other search terms related to corporate bonds and their ratings are:
★★★★★ death put
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corporate bonds
municipal bonds
treasury bonds