TT-C-490F
31 January 2013
SUPERSEDING
TT-C-490E
22 July 2002
FEDERAL SPECIFICATION
CHEMICAL CONVERSION COATINGS AND PRETREATMENTS
FOR METALLIC SUBSTRATES (BASE FOR ORGANIC COATINGS)
The General Services Administration has authorized the use of this federal specification,
by all federal agencies.
1. SCOPE AND CLASSIFICATION
1.1 Scope. This specification covers processes, pretreatments, and pre-primer surface preparations of
metallic substrates for coating applicators. It covers metal surface preparation for delaying corrosion
initiation and promoting primer adhesion. In addition, this specification covers the testing requirements
for qualification of conversion coatings, the pretreatments and pre-primer coatings.
1.2 Classification. This specification covers the following cleaning methods, surface preparation
processes, and metal classes (see 6.2).
1.2.1 Surface cleaning. Surface cleaning may include one or more of the following methods to meet
surface cleanliness requirements (see 6.1.1 and 6.1.2).
Method I - Mechanical or abrasive blast cleaning, sanding, grinding, in accordance
with The Society For Protective Coatings (SSPC) standards.
Method II - Solvent cleaning by immersion, spray, vapor, or hand wiping.
Method III - Detergent cleaning by immersion, spray, ultrasonic, hot alkaline, or electrolytic
methods.
AMSC N/A AREA MFFP
Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data
that may improve this document should be sent to: Director, U.S. Army Research Laboratory,
Weapons and Materials Research Directorate, Materials Manufacturing Technology Branch,
Specification and Standards Office, ATTN: RDRL-WMM-D, Aberdeen Proving Ground, MD
21005-5069 or emailed to
richard.j.squillacioti.civ@mail.mil. Since contact information can
change, you may want to verify the currency of this address information using the ASSIST
Online database at https://assist.dla.mil/online/start/.
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