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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

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