Passivating metal surfaces

作者: Larry D. Martin , William P. Banks

DOI:

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摘要: A method for passivating acid-cleaned ferrous metal surfaces is disclosed. The features the use of an aqueous solution having a pH greater than about 8, comprising base, oxygen containing gas, and one hydrazine, iron complexing agent mixtures thereof, wherein comprises contacting surface with at temperatures up to 400° F or greater.

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