White primer for coating 2219 aluminum alloy supplies a base for a top coating of enamel. A formulation of pigments and vehicle results in a primer with high corrosion resistance and minimum film thickness

Albrecht, R. H.

Jensen, D. P.

Schnake, P.

English

NASA Technical Reports Server

May 1966
	 Brief 66-10207 
White Primer Permits a Corrosion-Resistant Coating of Minimum Weight 
The problem: 
To develop a white primer with properties as good 
as, or superior to, tinted primers for coating 2219 
aluminum alloy with a base for a top coating such as 
MIL-E-5556A white flat enamel. The white primer 
must provide the alloy with high corrosion resistance 
and must combine with the enamel in a coating that 
affords good coverage with minimum film thickness. 
The solution: 
A formulation of pigments and vehicle that results 
in a white primer with superior properties of hiding 
and corrosion resistance. 
How it's done: 
A white primer of the following formulation gives 
excellent corrosion resistance and has superior hid-
ing quality for use with 2219 aluminum alloy: 
Pigment (40% by volume): 
Titanium dioxide (90% by volume) 
Zinc molybdate (10% by volume) 
Vehicle (60% by volume): 
Safflower urethane varnish 
Notes: 
1. For spraying, the primer is reduced 200% with 
toluene. 
2. The addition of 16 pounds of zirconium drier per 
100 gallons of primer produced a coating which,
at 0.1-mil thickness, permitted no corrosion of 2219 
aluminum alloy panels with scratch marks after 
two weeks continuous exposure to both 5% and 20% 
salt spray. 
3. The white primer permits excellent coverage with 
the MIL-E-5556A white fiat enamel at a film thick-
ness far less than would be required with a colored 
primer. 
4. This primer could be used effectively wherever 
aluminum components are subjected to corrosive 
environments. 
5. Inquiries concerning this invention may be di-
rected to:
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama, 35812 
Reference: B66-10207 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C., 20546. 
Source: Paul Schnake, Derwood P. Jensen, 
and Robert H. Albrecht 
of the Sherwin Williams Company 
under contract to

Marshall Space Flight Center 
(M-FS-304) 
Category 03 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19660000206 2020-03-11T17:31:30+00:00Z


White primer permits a corrosion-resistant coating of minimum weight

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