Corrosion inhibitors for ferrous metal in aqueous solutions comp

Details Corrosion inhibitors for ferrous metal in aqueous solutions comp Corrosion inhibitors for ferrous metal in aqueous solutions comp

1991-07-22

1992-08-18

Kyle, Deborah L.

Compositions

Preservative agents

Anti-corrosion

252396, 422 17, C23F 1112, C23F 1110

Patent

active

051397013

ABSTRACT:
A composition and method for controlling corrosion of steel in aqueous systems such as cooling and boiler systems. The combination of a nonionic surfactant and an anionic oxygen containing group such as one or more alkali metal salts of borate, molybdate and nitrate
itrite provide improved corrosion inhibition of steel in aqueous systems. The magnetite layers formed in the presence of this combination exhibit decreased porosity and increased corrosion resistance to acidic solutions. This combination also inhibits entry of hydrogen into steel when exposed to acidic solutions thereby inhibiting hydrogen embrittlement. The preferred nonionic surfactant is phenol/polyethylene oxide nonionic surfactant and the preferred alkali metal salt is Na.sub.2 MoO.sub.4.

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"Effect of Surfactants Upon Corrosion Inhibition of High-Strength Steels and Aluminum Alloys", Corosion-Nace, vol. 39, No. 7, Jul. 1983.
Betz Handbook of Industrial Water Conditioning, 8th ed., 1980, pp. 173-174.

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