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topic 5957

Phosphate Coating Removal Verification


We need to remove phosphate coating from fasteners prior to heat treatment. Can you tell me proper procedure how to do in prosess verification that phos coating is removed from fastener's surface. Thank you.

Miros Mackic
- Winnipeg, MB, Canada


If the phosphate has been sealed with oil you will need to degrease first. Cold inhibited HCl will totally remove phosphate without damaging the steel surface. R

Roger Bridger
Walterisation (UK) Ltd


Miros: Take a look in's letters Archive on the home page for letters #3563 and #4175. You will find more discussions on stripping phosphate coatings and verification method. Good luck.

Bill Boatright
- Raleigh, North Carolina

July 5, 2010

I would appreciate if a simple solution is provided to strip phosphate coatings on Fasteners & wire formed parts as a pre hardening solution to prevent formation of delta ferrite on the surface.

Veera Raghavan
- Chennai, India

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