ASTM F2832-11(2016)

Standard Guide for Accelerated Corrosion Testing for Mechanical Fasteners

ABSTRACT
This guide covers test procedures for performing accelerated tests to evaluate relative corrosion resistance of various coatings applied to mechanical fasteners. Corrosion mechanisms such as general and crevice corrosion may be evaluated with this method. Test duration may be selected to achieve any desired level of corrosion exposure and provides a frame of reference to determine relative coating resistance to corrosion. Fasteners tightened to a desired tension and subjected to this test procedure may be evaluated to simulate a variety of service conditions. Without large amounts of accumulated field results, it is difficult to relate test duration or the number of test cycles to actual service life for a given application.
SCOPE
1.1 This guide covers test procedures for performing accelerated tests to evaluate relative corrosion resistance of various coatings applied to mechanical fasteners. Corrosion mechanisms such as general and crevice corrosion may be evaluated with this method. Test duration may be selected to achieve any desired level of corrosion exposure and provides a frame of reference to determine relative coating resistance to corrosion. Fasteners tightened to a desired tension and subjected to this test procedure may be evaluated to simulate a variety of service conditions. Without large amounts of accumulated field results, it is difficult to relate test duration or the number of test cycles to actual service life for a given application.  
1.2 This standard is not intended to cover tests of driven fasteners such as nails, staples, screws and lag bolts.  
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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

• Status: Historical
• Publication Date: 31-Aug-2016
• ICS: 21.060.01 - Fasteners in general
• Technical Committee: F16 - Fasteners
• Drafting Committee: F16.01 - Test Methods

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F2832 − 11 (Reapproved 2016)
Standard Guide for
Accelerated Corrosion Testing for Mechanical Fasteners
This standard is issued under the fixed designation F2832; 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.
1. Scope F1470 Practice for Fastener Sampling for Specified Me-
chanical Properties and Performance Inspection
1.1 This guide covers test procedures for performing accel-
F1789 Terminology for F16 Mechanical Fasteners
erated tests to evaluate relative corrosion resistance of various
G1 Practice for Preparing, Cleaning, and Evaluating Corro-
coatings applied to mechanical fasteners. Corrosion mecha-
sion Test Specimens
nisms such as general and crevice corrosion may be evaluated
2.2 ASME Standard:
with this method. Test duration may be selected to achieve any
ASME B18.12 – Glossary of Terms for Mechanical Fasten-
desired level of corrosion exposure and provides a frame of
ers
reference to determine relative coating resistance to corrosion.
Fasteners tightened to a desired tension and subjected to this 2.3 IFI Standards
testproceduremaybeevaluatedtosimulateavarietyofservice IFI-170 –Accelerated CorrosionTest for Mechanical Fasten-
conditions.Withoutlargeamountsofaccumulatedfieldresults, ers
it is difficult to relate test duration or the number of test cycles
3. Terminology
to actual service life for a given application.
3.1 Definitions for many of the terms used in this standard
1.2 This standard is not intended to cover tests of driven
are included in Terminology F1789 and ASME B18.12.
fasteners such as nails, staples, screws and lag bolts.
3.2 Definitions of Terms Specific to This Standard:
1.3 Units—The values stated in SI units are to be regarded
3.2.1 cycle—a series of events scheduled over a 24-hour
as standard. No other units of measurement are included in this
period
standard.
3.2.2 phase—a test period which has elapsed for 8 cycles.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.2.3 test duration—a series of cycles as defined in
responsibility of the user of this standard to establish appro-
Section 4.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Test Duration
4.1 Test duration is specified as A, B, C, D or E in
2. Referenced Documents
accordance with Table 1.
2.1 ASTM Standards:
4.2 A typical cycle is shown in Table 2.
A480/A480M Specification for General Requirements for
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
5. Apparatus and Materials
Sheet, and Strip
5.1 Coupons 25.4 mm wide and 50.8 mm long having a
B117 Practice for Operating Salt Spray (Fog) Apparatus
thickness selected from Table 3 shall be used. Dimensional
B605 Specification for Electrodeposited Coatings of Tin-
tolerances of Specification A480/A480M shall apply. Coupons
Nickel Alloy
shall have a plain finish and be manufactured fromAISI–1008
D1193 Specification for Reagent Water
steel grade. Coupons shall be included with fasteners to be
tested to verify that uniform amounts of corrosion have been
produced by tests. Refer to Fig. 1, Fig. 1 (a) and Fig. 1(b) and
This guide is under the jurisdiction ofASTM Committee F16 on Fasteners and
Table 3. Inclusion of a metal loss coupon assists in making
is the direct responsibility of Subcommittee F16.01 on Test Methods.
Current edition approved Sept. 1, 2016. Published September 2016. Originally
approved in 2011. Last previous edition approved in 2011 as F2832– 11. DOI:
10.1520/F2832–11 Available from American Society of Mechanical Engineers (ASME), ASME
For referenced ASTM standards, visit the ASTM website, www.astm.org, or International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM www.asme.org.
Standards volume information, refer to the standard’s Document Summary page on Available from Industrial Fasteners Institute (IFI), 6363 Oak Tree Blvd.
the ASTM website. Independence, OH 44131 http://www.indfast.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2832 − 11 (2016)
TABLE 1 Test Duration
7.3 Coupons to be tested shall be permanently identified by
Test Duration Number of Cycles numbers stamped onto the surface.
A8
7.4 Coupons to be used shall be cleaned with a methanol or
B16
C40
acetone solution and weighed prior to use. A coupon’s weight
D80
in 6 0.5-mg shall be recorded for comparison with its weight
A
E (# of cycles) >80
after testing in accordance with Table 2.
A
For special applications as agreed between supplier and purchaser.
7.5 Coupons as shown in Fig. 1(a) shall be installed by
drilling a hole to accept a nonmetallic hex fastener. Coupons
shallberaisedabovecouponracksbytwononmetallicwashers
comparisons from one test to another and allows one to
quantify a repeatable test. to expose both sides of coupons to the test environment. A
minimum of 5 mm shall be provided for spacing between
5.2 A fog humidity cabinet shall be used in which salt mist
coupons and test rack surfaces. Fixtures shall be modified as
applications are coupled with high humidity and moderately
necessary to maintain isolation from rack materials while
high temperature. Water fog or visible water droplets on parts
creating and maintaining the required fastener tensions.
being tested shall be continuous after equilibrium is reached.
Dry-off may be sequenced manually or automatically. 7.6 Dry off shall consist of exposure to high temperature,
low humidity air in accordance with Table 4 for three hours.
5.3 Racks suitable for supporting bolt or screw assemblies
shall be agreed upon between supplier and purchaser. Test 7.7 Test coupon(s) shall be removed and analyzed after
dry-off in each phase. Each coupon shall be cleaned in
results shall always state materials used for racks during
testing. Nylon or other suitable nonmetallic washers shall be accordance with the procedures described in Practice G1.
installed to prevent bolt or screw heads or test coupons from
7.8 For corrosion products that are tightly adhered to the
contact with test racks. See Fig. 1 and 7.8.
fastener specimen, cleaning by mechanically abrading the
surfacebeforechemicalcleaningwillhelpremovetheadherent
6. Salt Mist Application and Dry-off
corrosion products. Vigorous mechanical cleaning may result
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F2832 − 11 F2832 − 11 (Reapproved 2016)
Standard Guide for
Accelerated Corrosion Testing for Mechanical Fasteners
This standard is issued under the fixed designation F2832; 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.
1. Scope
1.1 This guide covers test procedures for performing accelerated tests to evaluate relative corrosion resistance of various
coatings applied to mechanical fasteners. Corrosion mechanisms such as general and crevice corrosion may be evaluated with this
method. Test duration may be selected to achieve any desired level of corrosion exposure and provides a frame of reference to
determine relative coating resistance to corrosion. Fasteners tightened to a desired tension and subjected to this test procedure may
be evaluated to simulate a variety of service conditions. Without large amounts of accumulated field results, it is difficult to relate
test duration or the number of test cycles to actual service life for a given application.
1.2 This standard is not intended to cover tests of driven fasteners such as nails, staples, screws and lag bolts.
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard.
1.4 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.
2. Referenced Documents
2.1 ASTM Standards:
A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
B117 Practice for Operating Salt Spray (Fog) Apparatus
B605 Specification for Electrodeposited Coatings of Tin-Nickel Alloy
D1193 Specification for Reagent Water
F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
F1789 Terminology for F16 Mechanical Fasteners
G1 Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
2.2 ASME Standard:
ASME B18.12 – Glossary of Terms for Mechanical Fasteners
2.3 IFI Standards
IFI-170 –Accelerated Corrosion Test for Mechanical Fasteners
3. Terminology
3.1 Definitions for many of the terms used in this standard are included in Terminology F1789 and ASME B18.12.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 cycle—a series of events scheduled over a 24-hour period
3.2.2 phase—a test period which has elapsed for 8 cycles.
3.2.3 test duration—a series of cycles as defined in
Section 4.
This guide is under the jurisdiction of ASTM Committee F16 on Fasteners and is the direct responsibility of Subcommittee F16.01 on Test Methods.
Current edition approved Feb. 1, 2011Sept. 1, 2016. Published February 2011September 2016. Originally approved in 2011. Last previous edition approved in 2011 as
F2832– 11. DOI: 10.1520/F2832–11.10.1520/F2832–11
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, ThreeTwo Park Ave., New York, NY 10016-5990,
http://www.asme.org.
Available from Industrial Fasteners Institute (IFI), 6363 Oak Tree Blvd. Independence, OH 44131 http://www.indfast.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2832 − 11 (2016)
4. Test Duration
4.1 Test duration is specified as A, B, C, D or E in accordance with Table 1.
4.2 A typical cycle is shown in Table 2.
5. Apparatus and Materials
5.1 Coupons 25.4 mm wide and 50.8 mm long having a thickness selected from Table 3 shall be used. Dimensional tolerances
of Specification A480/A480M shall apply. Coupons shall have a plain finish and be manufactured from AISI–1008 steel grade.
Coupons shall be included with fasteners to be tested to verify that uniform amounts of corrosion have been produced by tests.
Refer to Fig. 1, Fig. 1 (a) and Fig. 1(b) and Table 3. Inclusion of a metal loss coupon assists in making comparisons from one test
to another and allows one to quantify a repeatable test.
5.2 A fog humidity cabinet shall be used in which salt mist applications are coupled with high humidity and moderately high
temperature. Water fog or visible water droplets on parts being tested shall be continuous after equilibrium is reached. Dry-off may
be sequenced manually or automatically.
5.3 Racks suitable for supporting bolt or screw assemblies shall be agreed upon between supplier and purchaser. Test results
shall always state materials used for racks during testing. Nylon or other suitable nonmetallic washers shall be installed to prevent
bolt or screw heads or test coupons from contact with test racks. See Fig. 1 and 7.8.
6. Salt Mist Application and Dry-off
6.1 Salt solution shall conform to requirements of Table 4. Solutions shall be sprayed by nozzles to provide a mist such that
test fasteners and coupons are thoroughly wet and dripping when examined visually. Solution collection rates shall conform to
Practice B117. Salt accumulations shall have been rinsed away during the salt solution spray application.
6.2 For the drying part of a cycle, a dry-off environment area shall be maintained with sufficient air circulation to assure uniform
temperature and shall allow thorough drying of tested fasteners and coupons. Temperature and humidity conditions are defined in
Table 4.
7. Test Procedure
7.1 Fasteners to be tested with salt spray, shall be sampled in accordance with Practice F1470, Sample Level B.
7.2 Each fastener to be tested shall be installed through its corresponding rack using nonmetallic washers as to maintain a
minimum of 5 mm spacing between underside of the head and surface of the rack. The washers for any testing protocol shall be
identical. Fig. 1(a) and Fig. 1(b) provide an illustrative representation. Holes in test racks shall be offset to avoid dripping from
one test fastener onto another. Fastener load shall be achieved through finger tightening (Fig. 1 illustrates the assembly). If higher
loads or proof load tightening is required then the
...