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topic 7744

Bluing/Black Oxide/Zinc Phosphate


I was wondering how the Bluing process compares to Black Oxide or Zinc Phosphate coatings? Also how thick of a coating does the bluing process provide and how does it hold up in salt spray corrosion testing IAW ASTM B117 [link by ed. to spec at TechStreet] ?


Robert S [last name deleted for privacy by Editor]
- Atlanta, Georgia


Black oxide and blueing are one in the same as far as chemistry is concerned. The difference is the amount of polish that the steel part receives prior to the oxide process. Generally, the higher the polish the "bluer" the appearance will be. Some call this blue color an iridescent color. Call on us for further questions.

Tom Walen
Springfield, Massachusetts

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