Tungstate based corrosion inhibitors

Details Tungstate based corrosion inhibitors Tungstate based corrosion inhibitors

2011-06-28

2011-06-28

Kopec, Mark (Department: 1766)

Compositions

Preservative agents

Anti-corrosion

C106S014120, C106S014130, C106S014210, C071S028000, C071S029000, C071S030000

Reexamination Certificate

active

07968007

ABSTRACT:
A trace amount of a tungstate added together with an ortho-phosphate and/or phosphonite is disclosed for inhibiting corrosion by a nitrogen fertilizer solution. In particular, an ammonium nitrate fertilizer solution is in contact with ferrous metal storage tanks, piping, and equipment surfaces. Tungstate added with an iron stabilizer including a dispersant polymer is also effective for inhibiting corrosion.

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