ASTM F1137-11

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Designation: F1137 – 11
Standard Specification for
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Phosphate/Oil Corrosion Protective Coatings for Fasteners
This standard is issued under the fixed designation F1137; 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.
TABLE 1 Classification and Performance Requirements of
1. Scope*
Protective Coatings
1.1 This specification covers the basic requirements for four
Grade No. Zinc Supplemental Coating Salt Spray,
grades of corrosion protection for fasteners. Grade A consists
Phosphate, Coating Thickness, µm h
2
of a zinc phosphate coating with no additional sealer (dry),
g/m
A
GradeBconsistsofazincphosphatecoatingwithadryorganic
Grade A 11, min none see 5.3 72
sealer, Grade C, and Grade D.1.2This specification is intended Grade B 11, min sealer see 5.3 72
Grade C 11, min protective oil-type see 5.3 24
primarily for fasteners such as nuts, clips, washers, and other
compound
ferrous threaded and non-threaded fasteners that require cor-
Grade D 11, min protective oil-type see 5.3 72
compound
rosion protection.
A
1.2 This specification is intended primarily for fasteners When testing Grade A finished parts, a protective oil coating shall be added
before salt spray testing.
such as nuts, clips, washers, and other ferrous threaded and
non-threaded fasteners that require corrosion protection.
4.1.3 Any additions agreed upon between the purchaser and
1.3 These coatings may or may not have a decorative finish.
the supplier.
2. Referenced Documents
5. Requirements
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2.1 ASTM Standards:
5.1 Appearance—Unless otherwise agreed upon between
B117 Practice for Operating Salt Spray (Fog) Apparatus
the purchaser and the producer, the color of the protective
F1470 Practice for Fastener Sampling for Specified Me-
coating shall be as-coated gray for Grades A, B, C, and D.
chanical Properties and Performance Inspection
5.2 Corrosion Resistance—These coatings shall be capable
of withstanding neutral salt spray for the minimum h specified
3. Classification
inTable 1 with no base metal corrosion on significant surfaces.
3.1 The zinc phosphate treatment and subsequent protective
Significant surfaces on threaded fasteners are defined as the
coatings are classified into four grades according to the
exposed surfaces when the fasteners are installed in a normal
requirements shown in Table 1.
manner (bolt head, nut head, face, etc.). On other surfaces
where control of the coating cannot be obtained under normal
4. Ordering Information
processing such as holes, recesses, threads, etc., the above
4.1 Orders for material under this specification shall include
requirements do not apply.
the following information:
5.3 Thread Fit—The maximum thickness of coating which
4.1.1 Quantity of parts,
may be applied to threads on threaded products is limited by
4.1.2 Grade required (see Table 1), and
the basic thread size (see 8.2). Threads may be produced
undersize/oversize (before coating) to accommodate the coat-
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This specification is under the jurisdiction of ASTM Committee F16 on ing thickness, providing the finished product (after coating)
Fasteners and is the direct responsibility of Subcommittee F16.03 on Coatings on
meets all specified mechanical properties. All undersize/
Fasteners.
oversize must be within permissible limits as agreed upon
Current edition approved May 1, 2011. Published May 2011. Originally
between the supplier and the purchaser.
approved in 1988. Last previous edition approved in 2006 as F1137 – 00(2006).
DOI: 10.1520/F1137-11.
5.4 Dry-to-Touch—Grade C shall be evenly coated and
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
dry-to-touchsuchthatwhenheldwithfilterpaperorequivalent
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
and applying hand pressure for 5 to 10 s, there shall be no
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. visible staining of the filter paper when viewed without use of
*A Summary of Changes section appears at the end of this standard.
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F1137 – 11
supplementary magnification. For referee purposes, this test
W = mass of deposit, g,
2
shall be performed using a force of 10 N as measured with a
A = area of deposit, m , and
3
load-indicating gage.
D = density of coating, kg/m .
6. Sampling
8. Inspection
6.1 The purchaser may request samples in accordance with
8.1 Samples shall be taken in accordance with Practice
Practice F1470.
F1470.
8.2 Ref
...