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Radiometric Study of Phosphate Coatings Formed on Steel in Pretreatment Baths

Thomas F. Boyd, Michael Galan, LEONARD MARKOWITZ

Abstract

An investigation has been made of the amount of phosphate coating formed on steel by various rustinhibiting solutions. The treatments used were phosphoric acid, phosphoric acid with sodium dichromate and sodium nitrite with diammonium phosphate and with sodium phosphates. No correlation was found between the amount of phosphate coating formed and corrosion resistance. The nature of the coating appears to be the significant factor. The most corrosion resistant coatings were formed by diammonium phosphate-sodium nitrite and sodium phosphatesodium nitrite treatments, the least by phosphoric acid alone.

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Key concepts: Phosphoric acid, Phosphate, Sodium nitrite, Diammonium phosphate, Sodium, Corrosion, Coating, Nuclear chemistry