‘JT-C-490C
March 18 1985
SUPERSEDING
ZT-C-490B
17uly21, 1971
FEDERAL SPECIFICATION
CLSANING MSTHODS FOR FB8NOUS SU8FACSS
AND PPETRBATMStWS FOR ORGANIC COATINGS
This specification was approved by the AS8i6tFintAdministrator
Office of Federal Supply and Services, Gsneral Services Admin-
istration, for the use of all Federal Agenaies.
1.
SCOPE AND cLASSIFICATION
1.1 a.
This specification covsrs cleaning, surface conditioning and
prsconditionin~ methods for improving the corimsion resistance of ferrous
metals. The application of chemical conversion and pretreatment coatings
provides uniformly textured substrates for rsceiving 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 speaification covers the following cleaning
methods and surface pm=treatment processes:
1.2.1 Surfaae cleaning shall be by any of the following methods as
6pecified (see 6.4):
Method I
- Mechanical or abrasive cleaning (for ferrous
surfaces only).
Method II
- Solvsnt (imnersion, spray or vapor).
Method III -
Eot alkaline (immersion, spray or electrolytic) for ferrous
surfaces only).
Method IV - Emulsion (with or without added water).
Method V
- Alkaline derustlng (for ferrous surfaces only).
Method VI
- Phosphoric said (alcoholic, detergent or solvsnt type with
detergent).
1.2.2 Chsnd.caloonvsrs.1.onand pretreatment coatings shall bs of the
following types as speaified (see 6.4).
I’ypeI - Zinc phosphate.
Type 11 - Iron phosphate.
TyPS III
- Organic pretreatment coating.
Type IV
- Non-aqueous iron phosphate.
/ Area MFFF /
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