The best replacement for anodizing is powder coating.

The best alternatives to anodizing are rated as following:
★★★★★  powder coating
★★★  electroplating
★★  plating
★★  hard anodizing
★★  cerakote
★★  duracoat
★★  galvanizing
★  powder coat
★  alodining
★  passivation
★  parkerizing
★  alodizing
★  chromate plating
  alodine
  powder coating aluminum
  chemical conversion coating
  class 2 anodizing
  hard coating
  painting aluminum
  chromate

Your alternative for anodizing is not listed? Suggest!
Speaking about anodizing, one probably shouldn't forget about aluminum.

Other search terms related to anodizing and their ratings are:
★★★★★ aluminum
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anodizing
powder coating
electroplating