Corrosion inhibition

Details Corrosion inhibition Corrosion inhibition

1976-01-14

1978-07-04

Padgett, Benjamin R.

Compositions

Preservative agents

Anti-corrosion

21 25R, 21 27R, 106 1414, 106 1417, 208 47, 252181, 252387, 252390, C23G 1116, C23G 1118

Patent

active

040987205

ABSTRACT:
Low toxicity, low pollution potential compositions and methods for inhibiting corrosion of ferrous and non-ferrous metallic parts in aqueous systems. The compositions have no chromate, no polyphosphate and no borate and consist essentially of alkali metal nitrite, alkali metal carbonate or bicarbonate and an azole. Preferably the compositions also include an alkali metal silicate and small amounts of an alkali metal hydroxide. In the corrosion inhibiting method, the aforesaid compositions are added to the system water in amounts sufficient to provide from about 100 to 10,000 parts per million ("ppm") of alkali metal nitrite, the primary inhibitor.

REFERENCES:
patent: 2877188 (1959-03-01), Liddell
patent: 2941953 (1960-06-01), Hatch
patent: 3272736 (1966-09-01), Petro et al.
patent: 3340001 (1967-09-01), Thornhill
patent: 3425954 (1969-02-01), Ruzevick et al.
patent: 3553137 (1971-01-01), Woods
patent: 3578589 (1971-05-01), Hwa

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