TT-C-490F
w/AMENDMENT 1
17 May 2013
SUPERSEDING
TT-C-490F
31 January 2013
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.
Method IV - Emulsion cleaning, with or without added water.
Method V - Derusting by chemical means.
Method VI - Phosphoric acid cleaner (detergent or solvent-type with detergent).
Method VII - Steam cleaning, with or without assisted pressure washing.
AMSC N/A AREA MFFP
Distribution Statement A. Approved for public release; distribution is unlimited.
Comments, suggestions, or questions on this document should be addressed to: Director, U.S. Army
Research Laboratory, Weapons and Materials Research Directorate, Specifications 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/.
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