Salt spray life of black zinc plating vs. black oxide

I am looking for a comparative salt spray life of various surface coatings on steel, especially blackodising Vs. Zinc Plating with black passivation. Relative data of various passivations will also help.

Sunil Pathak
product designer - Pune, India
2007

2007

Best to worst:
zinc plating + black chromate + organic sealer
zinc plating + black chromate
zinc plating
black oxide (waxed)
black oxide (oiled)
black oxide (without supplemental protection).

Black oxide without supplemental protection may even be worse than untreated steel.

Ken Vlach [deceased]
- Goleta, California

Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.

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