C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/16, 149/8
C23C 22/62 (2006.01)
Patent
CA 1081096
Abstract of the Disclosure A method for passivating acid-cleaned ferrous metal surfaces is disclosed. The method features the use of an aqueous passivating solution having a pH of greater than about 8, comprising a base, an oxygen con- taining gas, and one of hydrazine, an iron complexing agent and mixtures thereof, wherein the method comprises contacting an acid-cleaned ferrous metal surface with the passivating solution at temperatures up to about 400°F or greater.
272806
Banks William P.
Martin Larry D.
Company Halliburton
Na
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