Tungstate based corrosion inhibitors

C - Chemistry – Metallurgy – 23 – F

Patent

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Details

C23F 11/18 (2006.01) C05G 3/00 (2006.01)

Patent

CA 2658812

A trace amount of a tungstate is disclosed for inhibiting corrosion by nitrogen fertilizer solution, in particular, an ammonium nitrate fertilizer solution, (UAN) in contact with ferrous metal storage tanks, piping, and equipment surfaces. Tungstate added with a dispersant polymer is also effective for inhibiting corrosion.

Selon la présente invention, une trace d'un tungstate inhibe la corrosion par une solution d'engrais azoté, en particulier, une solution d'engrais à base de nitrate d'ammonium (mélange d'urée et de nitrate d'ammonium), mise en contact avec des réservoirs de stockage, une tuyauterie et des surfaces d'équipement en métal ferreux. Le tungstate ajouté avec un polymère dispersant est également efficace pour inhiber la corrosion.

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