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PVD Coatings for Erosion and Corrosion Resistance

November 2, 2016

Q. I am working in a petrochemical industry where we manufacture phosphoric acid(PA). Impellers used in PA slurry pumps have a very short life due to erosion-corrosion as they are exposed to highly corrosive and erosive service of PA slurry. Can PVD coating be used to reduce the effect of erosion-corrosion?
Composition of PA slurry: 22% PA, 15% P2O5, 10.5% silica, 2.7% H2SO4, 1.5% fluorine, 40% CaSO4.
Temperature around 80 °C

siddharth aparajith
- gujarat, India

November 7, 2016

A. PVD coating might be able to help. Most PVD finishes are hard enough to handle any erosion. May have to try different coatings for corrosion protection. Make sure you work with a tool coater. You're going to need a relatively thick, dense, fully hard coating, not the thin coating deposited by decorative coaters.

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Jim Treglio
- Vista, California

November 9, 2016

A. This is a case of severe physical and chemical erosion and corrosion. Multi layer thick coating with carefully chosen materials might help. One should perhaps try to neutralize acids and remove fluorine. This is just thinking aloud. It needs to be researched painstakingly.

H.R. Prabhakara
- Bangalore, Karnataka, India

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