Process for preventing corrosion by incorporative soluble metal

Details Process for preventing corrosion by incorporative soluble metal Process for preventing corrosion by incorporative soluble metal

1969-06-27

1976-06-15

Schofer, Joseph L.

Chemistry: fertilizers

Processes and products

Inorganic material

71 36, 71 48, 71 51, 106 14, 148 616, 252393, 423313, C05B 700, C01B 1516, C01B 2526, C23C 110

Patent

active

039634728

ABSTRACT:
A soluble chromate or dichromate is incorporated in a system comprising a metal and an orthophosphate-containing liquid to inhibit corrosion of the system under highly turbulent conditions. The system in which the chromate or dichromate is incorporated is a system in which the metal surface is normally passivated against corrosion by an orthophosphate-containing film; however under the erosive conditions experienced by the system, the phosphate film is destroyed. The incorporation of the chromate or dichromate in the system prevents corrosion under such conditions. In a typical system, a chromate or dichromate is incorporated in an ammonium phosphate solution which is exposed to contact with a ferrous metal.

REFERENCES:
patent: 2819193 (1958-01-01), Rausch
patent: 2832708 (1958-04-01), Karchner
patent: 2835618 (1958-05-01), Keller et al.
patent: 2900222 (1959-08-01), Kahler et al.

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