TT-C-490
March :10, 1961
(see 6. 10)
FEDERAL SPECIFICATION
CLRANING METRODS AIW3PRETREATMENT OF FERROUS
SURFACES FOR ORGANIC COATINGS
!fhis specification was approved by the Commissioner, Federal
Supply Service, General Servicee Administration, for the uee of
all Federal agencies.
1. SCOPE AND CLASSIFICATION
1.1 Scope. Ttis specification covers the cleanfng methods and pretreatment of
ferrous metals for. the application cf organk coatings (paint, varntsh, lacquer,
enamel, etc. ) sndfn addition ferrous metals or items having ztnc or aluminum
surfaces or acceesory falm!cated parts of zinc or aluminum requtring treatment
(SSS 6. 11).
L 2 Cfasstffcation. This specification covers tbe following cleaning methods
and surfaces pretreatment processes:
1.2.1 Surface cleeniug shall be.by the following methcde as speoifted (see 6. 2):
Method I - Mechanical or abrasive cleaning (send, shot, grit, or seed
blasting or tumblfng preceded by decreasing if necessary to assure a grease-free
surface and fotlowed bymleantng to remove duet and metal particles) (for ferrous
surfaces only).
Method II --Solvent (immersion, spray or vapor)
Method III--Hot af.fcafine (fmmereion, spray or ekctmlytic) (for ferrous
surfaces only)
Method IV--Emulsion (with or without added water, and followed by a water
rtnse. )
Method V--Alkaline cferueting (for fwrous surfaces onIy).
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. 2):
Type I--Zinc phosphate
Type II--Iron phosphate
Type IfI--Organtc pretreatment coating
2. APPLICABLE SPECIFICATIONS AND STANDARDS
2.1 The following specffieatinns and standards, of the issue in effect on date of
invitation for bids, form a part of this spec~lcation to the extent epecified herein.
Federal Specifications:
QQ-Z-325 -Zinc Plating (Electrodeposited)
PPP-T-60 -Tape; Pressure Sensitive, Adhesive, Waterproof-: w
Packaging and SeaIing.
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