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ASTM F 1428 Document Information:
Title
Standard Specification for Aluminum Particle-Filled Basecoat/Organic or Inorganic Topcoat, Corrosion Protective Coatings for Fasteners
ASTM International
Publication Date:
Aug 15, 1992
Scope:
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.
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.
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
and are for service where
temperatures do not exceed 230°C (450°F).
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).
These coatings are applied by conventional dip/spin, dip/drain, or
spray methods.
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.
The coating systems defined by this specification can be applied to
ferrous alloy steels, aluminum,
and ferritic and austenitic stainless steels.
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.
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