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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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Bonding to Nitrided Surface
I am looking for a corrosion resistant coating for custom fasteners that needs to be later bonded-to with a rubberized epoxy coating. This is for a sub-sea application subject to fatigue loading.
I'm considering Zinc phosphate, which is offered by my fastener vendor, which I understand is commonly used as a primer, but I know that phosphate coatings do not offer the greatest corrosion resistance.
What about QPQ? The surface coating is low friction, which usually means poor adhesion, but is there another primer that can go between the QPQ and the Epoxy?
Product Design Engineer - Horsham, Pennsylvania, USA
August 12, 2010
In my understanding "QPQ" Quench + Polish + Quench, this is Salt Bath Nitriding + Oxidation.
After QPQ, surface finish is very smooth, better you do the Epoxy after 1st Quench. after the 1st quench the surface are slightly porous, epoxy will deposit very easily. Kannan B
- Salem, TamilNadu, India
August 16, 2010
Dear Mike Orlet,
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