ASTM F1428-92(1999)
(Specification)Standard Specification for Aluminum Particle-Filled Basecoat/Organic or Inorganic Topcoat, Corrosion Protective Coatings for Fasteners
Standard Specification for Aluminum Particle-Filled Basecoat/Organic or Inorganic Topcoat, Corrosion Protective Coatings for Fasteners
SCOPE
1.1 This specification covers the basic requirements for a corrosion-resistant coating consisting of an inorganic aluminum particle-filled basecoat and an organic or inorganic topcoat, depending on the specific requirements.
1.2 The coating may be specified with basecoat only, or with the top coated with compatible organic polymer or inorganic topcoats, depending on the specific requirements.
1.3 The basecoat is a water-dilutable slurry containing aluminum particles dispersed in a liquid binder of chromate/ phosphate compounds.
1.4 The organic topcoats consist of polymer resins and dispersed pigments and are for service where temperatures do not exceed 230°C (450°F).
1.5 The inorganic topcoats consist of ceramic oxide pigments dispersed in a liquid binder of chromate/phosphate compounds and are for service where temperatures do not exceed 645°C (1200°F).
1.6 These coatings are applied by conventional dip/spin, dip/drain, or spray methods.
1.7 The coating process does not normally induce hydrogen embrittlement, provided that the parts to be coated have not been subjected to an acid cleaner or pretreatment (see Note 1). Note 1-Although this coating material contains water, it has a relatively low susceptibility to inducing hydrogen embrittlement in steel parts of tensile strengths equal to or greater than 1000 MPa (approximately RC31). Normal precautions for preparing, descaling, and cleaning steels of these tensile strengths must be observed. An initial stress relief treatment should be considered prior to any chemical treatment or cleaning operation. Acids or other treatments that evolve hydrogen should be avoided. Mechanical cleaning methods may be considered. Some steels are more susceptible to hydrogen embrittlement than others and may also require hydrogen embrittlement relief baking after cleaning but before coating. Since no process can completely guarantee freedom from embrittlement, careful consideration must be given to the entire coating process and the specific steel alloy employed.
1.8 The coating systems defined by this specification can be applied to ferrous alloy steels, aluminum, and ferritic and austenitic stainless steels.
1.9 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.10 The following safety hazards caveat pertains only to the test methods portion, Section 6, of this specification: This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: F 1428 – 92 (Reapproved 1999)
Standard Specification for
Aluminum Particle-Filled Basecoat/Organic or Inorganic
Topcoat, Corrosion Protective Coatings for Fasteners
This standard is issued under the fixed designation F 1428; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 1.8 The coating systems defined by this specification can be
applied to ferrous alloy steels, aluminum, and ferritic and
1.1 This specification covers the basic requirements for a
austenitic stainless steels.
corrosion-resistant coating consisting of an inorganic alumi-
1.9 The values stated in SI units are to be regarded as the
num particle-filled basecoat and an organic or inorganic
standard. The values given in parentheses are for information
topcoat, depending on the specific requirements.
only.
1.2 Thecoatingmaybespecifiedwithbasecoatonly,orwith
1.10 The following safety hazards caveat pertains only to
the top coated with compatible organic polymer or inorganic
the test methods portion, Section 6, of this specification: This
topcoats, depending on the specific requirements.
standarddoesnotpurporttoaddressallofthesafetyproblems,
1.3 The basecoat is a water-dilutable slurry containing
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
aluminum particles dispersed in a liquid binder of chromate/
of this standard to establish appropriate safety and health
phosphate compounds.
practices and determine the applicability of regulatory limita-
1.4 The organic topcoats consist of polymer resins and
tions prior to use.
dispersed pigments and are for service where temperatures do
not exceed 230°C (450°F).
2. Referenced Documents
1.5 The inorganic topcoats consist of ceramic oxide pig-
2.1 ASTM Standards:
ments dispersed in a liquid binder of chromate/phosphate
B 117 Test Method of Salt Spray (Fog) Testing
compounds and are for service where temperatures do not
B 487 Test Method for Measurement of Metal and Oxide
exceed 645°C (1200°F).
Coating Thicknesses by Microscopical Examination of a
1.6 These coatings are applied by conventional dip/spin,
Cross Section
dip/drain, or spray methods.
B 568 Test Method for Measurement of Coating Thickness
1.7 The coating process does not normally induce hydrogen
by X-Ray Spectrometry
embrittlement, provided that the parts to be coated have not
D 1186 Test Methods for Nondestructive Measurement of
been subjected to an acid cleaner or pretreatment (see Note 1).
Dry Film Thickness of Nonmagnetic Coatings Applied to
NOTE 1—Although this coating material contains water, it has a
a Ferrous Base
relatively low susceptibility to inducing hydrogen embrittlement in steel
D 2247 PracticeforTestingWaterResistanceofCoatingsin
parts of tensile strengths equal to or greater than 1000 MPa (approxi-
100 % Relative Humidity
mately RC31). Normal precautions for preparing, descaling, and cleaning
D 3359 Test Methods for Measuring Adhesion by Tape
steels of these tensile strengths must be observed. An initial stress relief
Test
treatment should be considered prior to any chemical treatment or
cleaning operation.Acids or other treatments that evolve hydrogen should E 122 Practice for Choice of Sample Size to Estimate a
beavoided.Mechanicalcleaningmethodsmaybeconsidered.Somesteels
Measure of Quality for a Lot or Process
are more susceptible to hydrogen embrittlement than others and may also
E 376 Practice for Measuring Coating Thickness by
require hydrogen embrittlement relief baking after cleaning but before
Magnetic-Field or Eddy-Current (Electromagnetic) Test
coating. Since no process can completely guarantee freedom from
Methods
embrittlement, careful consideration must be given to the entire coating
process and the specific steel alloy employed.
Annual Book of ASTM Standards, Vol 03.02.
1 3
This specification is under the jurisdiction of ASTM Committee F-16 on Annual Book of ASTM Standards, Vol 02.05.
FastenersandisthedirectresponsibilityofSubcommitteeF16.03onMetalCoatings Annual Book of ASTM Standards, Vol 06.01.
on Threaded Fasteners. Annual Book of ASTM Standards, Vol 14.02.
Current edition approved Aug. 15, 1992. Published October 1992. Annual Book of ASTM Standards, Vol 03.03.
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F 1428
3. Classification 5.3 Corrosion—These coatings shall be capable of with-
standing neutral salt spray testing for the minimum time
3.1 The inorganic aluminum particle-filled basecoat and the
specified in Table 1. Unless otherwise defined, acceptable
subsequent topcoats are classified into three groups, with
corrosion resistance shall be considered to be met where there
subsequent subgroups formed according to the requirements
is no base metal corrosion on significant surfaces.
given in Table 1. The coating bath requirements and cure
5.3.1 Significant surfaces on threaded fasteners are defined
temperatures recommended by the chemical manufacturer
as the surfaces exposed when the fasteners are installed in a
should be followed.
normal manner (bolt head, nut drive, face, etc.). On other
3.2 Regardless of the processes or materials used, the
surfaces on which coating control cannot be obtained under
inorganic and organic coatings shall conform to all of the
normal processing, such as holes, recesses, threads, etc., the
applicable requirements of this specification.
above requirements do not apply.
5.4 Thread-Fit—The coating shall not have an adverse
4. Ordering Information
effect on normal installation and removal practices, as deter-
4.1 Orders for material in accordance with this specification
mined by the proper “GO” thread gage or the fit and function
shall include the following information:
inspection method (see 8.2).
4.1.1 Quantity of parts,
5.4.1 Sizing—The thickness of the coating is limited by the
4.1.2 Grade of coating (see Table 1),
basic thread size. Where greater thickness is necessary, threads
4.1.3 Color of coating,
may be produced undersize or oversize (before coating) to
4.1.4 Any additions to specifications as agreed upon by the
accommodate the coating thickness, providing that the finished
purchaser and the supplier, and
fastener (after coating) meet
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