ASTM F1428-92(2005)
(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
ABSTRACT
This specification covers corrosion-resistant coating consisting of an inorganic aluminum particle-filled basecoat and an organic or inorganic topcoat. The basecoat is a water-dilutable slurry containing aluminum particles dispersed in a liquid binder of chromate/phosphate compounds. The organic topcoats consist of polymer resins and dispersed pigments. The inorganic topcoats consist of ceramic oxide pigments dispersed in a liquid binder of chromate/phosphate compounds. These coatings are applied by conventional dip/spin, dip/drain, or spray methods. The coating systems defined by this specification can be applied to ferrous alloy steels, aluminum, and ferritic and austenitic stainless steels. The inorganic aluminum particle-filled basecoat and the subsequent topcoats are classified into three groups, with subsequent subgroups. Materials shall be tested and the individual grades shall conform to specified values of appearance, adhesion, corrosion, thread-fit, weathering, coating thickness, and humidity.
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 230C (450F).
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 645C (1200F).
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.
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 concerns, 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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F1428 – 92 (Reapproved 2005)
Standard Specification for
Aluminum Particle-Filled Basecoat/Organic or Inorganic
Topcoat, Corrosion Protective Coatings for Fasteners
This standard is issued under the fixed designation F1428; 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 (´) indicates an editorial change since the last revision or reapproval.
embrittlement, careful consideration must be given to the entire coating
1. Scope
process and the specific steel alloy employed.
1.1 This specification covers the basic requirements for a
1.8 The coating systems defined by this specification can be
corrosion-resistant coating consisting of an inorganic alumi-
applied to ferrous alloy steels, aluminum, and ferritic and
num particle-filled basecoat and an organic or inorganic
austenitic stainless steels.
topcoat, depending on the specific requirements.
1.9 The values stated in SI units are to be regarded as the
1.2 Thecoatingmaybespecifiedwithbasecoatonly,orwith
standard. The values given in parentheses are for information
the top coated with compatible organic polymer or inorganic
only.
topcoats, depending on the specific requirements.
1.10 The following safety hazards caveat pertains only to
1.3 The basecoat is a water-dilutable slurry containing
the test methods portion, Section 6, of this specification: This
aluminum particles dispersed in a liquid binder of chromate/
standarddoesnotpurporttoaddressallofthesafetyconcerns,
phosphate compounds.
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
1.4 The organic topcoats consist of polymer resins and
of this standard to establish appropriate safety and health
dispersed pigments and are for service where temperatures do
practices and determine the applicability of regulatory limita-
not exceed 230°C (450°F).
tions prior to use.
1.5 The inorganic topcoats consist of ceramic oxide pig-
ments dispersed in a liquid binder of chromate/phosphate
2. Referenced Documents
compounds and are for service where temperatures do not
2.1 ASTM Standards:
exceed 645°C (1200°F).
B117 Practice for Operating Salt Spray (Fog) Apparatus
1.6 These coatings are applied by conventional dip/spin,
B487 Test Method for Measurement of Metal and Oxide
dip/drain, or spray methods.
CoatingThicknessbyMicroscopicalExaminationofCross
1.7 The coating process does not normally induce hydrogen
Section
embrittlement, provided that the parts to be coated have not
B568 Test Method for Measurement of Coating Thickness
been subjected to an acid cleaner or pretreatment (see Note 1).
by X-Ray Spectrometry
NOTE 1—Although this coating material contains water, it has a
D1186 Test Methods for Nondestructive Measurement of
relatively low susceptibility to inducing hydrogen embrittlement in steel
Dry Film Thickness of Nonmagnetic Coatings Applied to
parts of tensile strengths equal to or greater than 1000 MPa (approxi-
a Ferrous Base
mately RC31). Normal precautions for preparing, descaling, and cleaning
D2247 Practice for Testing Water Resistance of Coatings in
steels of these tensile strengths must be observed. An initial stress relief
treatment should be considered prior to any chemical treatment or 100 % Relative Humidity
cleaning operation.Acids or other treatments that evolve hydrogen should
D3359 Test Methods for Measuring Adhesion by Tape Test
beavoided.Mechanicalcleaningmethodsmaybeconsidered.Somesteels
E122 Practice for Calculating Sample Size to Estimate,
are more susceptible to hydrogen embrittlement than others and may also
With Specified Precision, the Average for a Characteristic
require hydrogen embrittlement relief baking after cleaning but before
of a Lot or Process
coating. Since no process can completely guarantee freedom from
1 2
This specification is under the jurisdiction of ASTM Committee F16 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Fasteners and is the direct responsibility of Subcommittee F16.03 on Coatings on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Fasteners. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved May 1, 2005. Published May 2005. Originally the ASTM website.
approved in 1992. Last previous edition approved in 1999 as F1428 – 92 (1999). Withdrawn. The last approved version of this historical standard is referenced
DOI: 10.1520/F1428-92R05. on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F1428 – 92 (2005)
E376 Practice for Measuring Coating Thickness by tape-tested immediately after a 10-min recovery period from
Magnetic-FieldorEddy-Current(Electromagnetic)Exami- the humidity test, and there shall be no other peeling under the
nation Methods tape.
5.3 Corrosion—These coatings shall be capable of with-
3. Classification
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, and so forth). On
3.2 Regardless of the processes or materials used, the
other surfaces on which coating control cannot be obtained
inorganic and organic coatings shall conform to all of the under normal processing, such as holes, recesses, threads, and
applicable requirements of this specification.
so forth, the 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, th
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