COMPARISON OF CORROSION RESISTANCE OF ZINC CHROMATE PRIMER TO EPOXY PRIMER

reportActive / Technical Report | Accession Number: AD0425105 | Open PDF

Abstract:

The need to apply epoxy finishing systems to stock primed with zinc chromate primer has made it necessary to determine if the corrosion resistance of this system is adequate. It is also desired to use only one coat of epoxy primer on stock not already primed with zinc chromate primer provided adequate corrosion resistance can be attained. Test assemblies were fabricated of 7178-T6 non-clad aluminum panels. Panels covered with one coat of epoxy primer and panels covered with one coat of epoxy primer over one coat of zinc chromate primer were riveted to control panels covered with two coats of zinc chromate primer. The eight assemblies were exposed to salt spray corrosion tests. Assemblies were removed from the test environment at intervals of 168 hours, until all specimens had been removed. Examination revealed no corrosion on any of the test specimens after exposure to the salt spray environment for periods up to 672 hours. The single epoxy primer coat and the single epoxy primer coat over one coat of zinc chromate primer are considered equal in salt spray corrosion resistance.

Author(s):
Swafford, Joseph S.
Author Organization(s):
MCDONNELL AIRCRAFT CORP ST LOUIS MO
Descriptive Note:
Final rept.
Supplementary Note:
DOI: 10.21236/AD0425105
Pagination:
0013

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release, Document Partially Illegible
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited. Document Partially Illegible.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
A-264
Contract/Grant Number(s):
AF 33(657)-11215
Monitor Series:
ASD
 Subject Terms
Communities of Interest:
Air Platforms
Descriptor(s):
*CORROSION INHIBITION, *PROTECTIVE TREATMENTS, *PLASTIC COATINGS, CHROMATES, ZINC COMPOUNDS, SALT SPRAY TESTS, PAINT PRIMERS, ALUMINUM, METAL PLATES, EPOXY RESINS
Field(s)/Group(s):
Coatings, Colorants and Finishes
Keyword(s):
ALUMINUM ALLOY 7178, ZINC CHROMATE
Report Date:
1963 Dec 10