Abstract of the Disclosure A method for passivating acid-cleaned ferrousmetal surfaces is disclosed. The method features theuse of an aqueous passivating solution having a pH ofgreater than about 8, comprising a base, an oxygen con-taining gas, and one of hydrazine, an iron complexingagent and mixtures thereof, wherein the method comprisescontacting an acid-cleaned ferrous metal surface withthe passivating solution at temperatures up to about400�F or greater.

Title
Methode de passivation des surfaces metalliques
Passivating metal surfaces
Application Number
272806
Publication Number
1081096
Publication Date
July 8, 1980
Inventor
Banks William P
Martin Larry D
Assignee
Halliburton Company
IPC
C23F 09/02
C23C 22/62
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