INCH-POUND
ÄÄÄÄÄÄÄÄÄÄ
TT-C-490D
March 31, 1993
SUPERSEDING
TT-C-490C
March 19, 1985
FEDERAL SPECIFICATION
CLEANING METHODS FOR FERROUS SURFACES
AND PRETREATMENTS FOR ORGANIC COATINGS
This specification was approved by the Assistant Administrator Office of
Federal Supply and Services, General Services Administration, for the use of
all Federal Agencies.
1. SCOPE AND CLASSIFICATION
1.1 SCORE. This specification covers cleaning, surface conditioning, and
preconditioning methods for improving the corrosion resistance of ferrous
metals. The application of chemical conversion and pretreatment coatings
provides uniformly textured substrates for receiving and retaining paint,
lacquer, etc. In addition, this specification covers suitable cleaning
processes for nonferrous surfaces (see 6.1, 6.1.2).
1.2 Classification. This specification covers the following cleaning
methods and surface pretreatment processes:
1.2.1 Surface cleaning shall be by any of the following methods as
specified (see 6.4):
Method I - Mechanical or abrasive cleaning (for ferrous surfaces only).
Method II - Solvent (immersion, spray or vapor).
Method III - Hot alkaline (immersion, spray or electrolytic, for ferrous
surfaces only).
Method IV - Emulsion (with or without added water).
Method V - Alkaline derusting (for ferrous surfaces only).
Method VI - Phosphoric acid (alcoholic, detergent or solvent type with
detergent).
1.2.2 Chemical conversion and pretreatment coatings shall be of the
following types as specified (see 6.4).
Type I - Zinc phosphate spray application (150 mg/sq ft min - 500
mg/sq ft max)
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ Beneficial comments (recommendations, additions, deletions) and any ³
³ pertinent data which may be of use in improving this document should ³
³ be addressed to: U.S. Army Research Laboratory, Materials Directorate, ³
³ Materials Standardization Office, ATTN: AMSRL-MA-S, Watertown, MA ³
³ 02172-0001 by using the Standardization Document Improvement Proposal (DD ³
³ Form 1426) appearing at the end of this document or by letter. ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
AMSC N/A AREA MFFP
DISTRIBUTION STATEMENT A. Approved for public release: distribution
unlimited.
Downloaded from http://www.everyspec.com
