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Whats the difference between conversion, sealing, and passivation?

April 26, 2017conversion difference Passivation sealing

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Whats the difference between conversion, sealing, and passivation?

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A conversion coating interacts chemically with zinc to add corrosion resistance. A sealer fills microscopic voids in zinc and zinc phosphate. Both conversion coatings and sealers may be painted. Passivation uses chromium to increase zinc’s resistance to corrosion, and produces a surface that is not paintable.