The best replacement for passivation is electropolishing.


The best alternatives to passivation are rated as following:
★★★★★  electropolishing
★★★★  electropolish
★★  pickling
★★  anodizing
★★  cadmium plating
★  glassivation
  passivation
  citric passivation
  zinc plating
  electro polishing
  activation

Your alternative for passivation is not listed? Suggest!
Speaking about passivation, one probably shouldn't forget about citric acid stainless steel.

Other search terms related to passivation and their ratings are:

★★★★★ citric acid stainless steel
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