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Is 440C SST + Electropolishing adequate to anti-corrosion

I'm looking for new material + surface finishing to be the best of corrosion resistant property to perform as pneumatic piston in environment of 60-100 PSI pressure , O-ring ,and Fomblin VAC 3 lubricator. I have trouble the corrosion with current material , 440C SST + electro polishing. Please also suggest.

Sudsakron L.
Seagate - Korat, Thailand
2005

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