Accession Number : ADA323451

Title :   Surface Quality Impact of Replacing Vapor Degreasers with Aqueous Immersion Systems.

Descriptive Note : Technical rept.,

Corporate Author : ENVIRONMENTAL PROTECTION AGENCY CINCINNATI OH RISK REDUCTION ENGINEERING LAB

Personal Author(s) : Kodres, C. ; Polly, D. ; Hoffard, T. ; Anguiano, G.

PDF Url : ADA323451

Report Date : MAR 1997

Pagination or Media Count : 87

Abstract : With effective vapor degreasing solvents environmentally suspect, other methods of cleaning metal surfaces must be used. Aqueous immersion cleaning, currently the preferred method for intermediate, lighter duty cleaning, is a promising alternative for precleaning and degreasing. Alkaline cleaners are the principal aqueous cleaner group and represent the most workable, broad substitute for vapor degreasers. The efficiencies of aqueous immersion degreasing and vapor degreasing for removing contaminants from an aluminum surface are compared. Intentionally soiled, artificially weathered 7075 aluminum panels are degreased and then either anodized or chemically conversion coated. The quantity and composition of the contaminant is determined after the cleaning. The performance of the coating is then ascertained and correlated with the contaminant history. The degreasing system is shown to have no effect on the performance of anodized or chemically conversion coated aluminum surfaces. Performance is assessed in terms of resistance to both corrosion and abrasion and on the integrity of the oxide coating. The subsequent light duty immersion cleaning and pickling removes any soil that survives the degreasing. Very little contamination survives the light duty cleaning.

Descriptors :   *ALUMINUM, *SOLVENTS, *CHEMICAL CLEANING, SURFACES, CORROSION RESISTANCE, CONTAMINANTS, GREASES, IMMERSION, ANODIC COATINGS, ABRASION.

Subject Categories : Industrial Chemistry and Chemical Processing
      Solvents, Cleaners, and Abrasives

Distribution Statement : APPROVED FOR PUBLIC RELEASE