ASTM F1110-09(2020)
(Test Method)Standard Test Method for Sandwich Corrosion Test
Standard Test Method for Sandwich Corrosion Test
SIGNIFICANCE AND USE
5.1 The data generated by this test method shall be used to determine whether aircraft structural aluminum alloys are liable to be corroded or damaged by application of the test material during routine maintenance operations.
5.2 Interpretation of the sandwich corrosion test results is based on a comparison of the appearance of faying surfaces of three sets of coupons. One set of test coupons is exposed with reagent water only in the faying surfaces, to establish the baseline (controls) against which the panels exposed to the test material are compared. Disregard corrosion at cut edges of the test coupons.
5.3 The relative corrosion severity rating system is provided in order to allow a numerical classification of the test results and to eliminate the necessity for elaborate weight loss measurements. Pitting corrosion, which is rated 4—extensive (severe) corrosion, may involve only a negligible weight loss.
5.4 Relative corrosion severity rating system:
Appearance/Corrosion:
0—No visible corrosion and no discoloration present
1—Very slight corrosion or very slight discoloration, and/or up to 5 % of areaA corroded
2—Discoloration and/or up to 10 % of areaA corroded
3—Discoloration and/or up to 25 % of areaA corroded
4—Discoloration and/or more than 25 % of areaA corroded, and/or pitting
present (A) ”Area” refers to area under the filter paper, or if no filter paper is used, the area where the test material was applied.
SCOPE
1.1 This test method defines the procedure for evaluating the corrosivity of aircraft maintenance chemicals, when present between faying surfaces (sandwich) of aluminum alloys commonly used for aircraft structures. This test method is intended to be used in the qualification and approval of compounds employed in aircraft maintenance operations.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information.
1.3 This standard may involve hazardous materials, operations, and equipment. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements appear in Section 9.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 31-Oct-2020
- Technical Committee
- F07 - Aerospace and Aircraft
- Drafting Committee
- F07.07 - Qualification Testing of Aircraft Cleaning Materials
Relations
- Effective Date
- 01-May-2013
- Effective Date
- 01-Oct-2010
- Effective Date
- 01-May-2008
- Effective Date
- 01-Mar-2006
- Effective Date
- 01-May-2005
- Effective Date
- 10-Nov-2002
- Effective Date
- 10-Dec-2000
- Effective Date
- 10-Feb-1999
- Effective Date
- 10-Feb-1999
- Effective Date
- 10-Jan-1999
Overview
ASTM F1110-09(2020) - Standard Test Method for Sandwich Corrosion Test establishes a procedure for evaluating the corrosivity of aircraft maintenance chemicals that may become trapped between the "sandwiched" faying surfaces of aluminum alloys commonly used in aircraft structures. This standard provides a comparative and accelerated environmental test designed to determine the potential for corrosion or damage to aluminum alloys as a result of routine maintenance operations. It is a vital resource for organizations seeking to qualify and approve cleaning products, lubricants, sealants, and other compounds used during aircraft maintenance.
This test method is approved for use by agencies such as the U.S. Department of Defense and aligns with internationally recognized standardization principles, making it relevant worldwide for ensuring aircraft safety, integrity, and compliance.
Key Topics
- Corrosivity Evaluation: Focuses on assessing how test materials (chemicals or compounds) interact with faying surfaces of structural aluminum alloys.
- Test Procedure:
- Preparation of aluminum coupons (test panels) with specific alloys.
- Application of maintenance chemicals, both in diluted and concentrated forms, to coupon sandwiches.
- Controlled environmental exposure in alternating cycles of high humidity and ambient air.
- Result Interpretation:
- Comparison against control coupons exposed only to reagent water.
- Corrosion severity rated on a 0–4 scale:
- 0: No visible corrosion or discoloration.
- 1: Slight corrosion/discoloration, up to 5% area affected.
- 2: Up to 10% area affected.
- 3: Up to 25% area affected.
- 4: Over 25% area affected and/or pitting present.
- Reporting and Classification: Results enable a straightforward, numerical rating, eliminating the need for complex weight loss measurements.
- Safety Considerations: Users must assess and address all safety, health, and environmental hazards associated with the chemicals and equipment involved.
Applications
The ASTM F1110-09(2020) standard is widely applied in the aerospace industry to:
- Qualify Aircraft Maintenance Chemicals: Ensures that cleaning agents, lubricants, and other compounds will not cause unacceptable corrosion to structural aluminum during service.
- Regulatory Compliance: Provides the test method required for demonstrating compliance with maintenance product approval processes enforced by aviation authorities and defense agencies.
- Materials Testing and Product Development: Manufacturers utilize the standard in R&D to evaluate new products before release, minimizing the risk of future corrosion issues.
- Maintenance Procedure Validation: Helps operators and maintenance organizations verify that routine operations will not compromise aircraft structural integrity.
- Quality Assurance in Aerospace MRO: Used by Maintenance, Repair, and Overhaul (MRO) facilities to qualify products for ongoing usage and supplier approval.
Related Standards
ASTM F1110-09(2020) references and relates to several additional industry and military standards, including:
- ASTM D1193 - Specification for Reagent Water
- ASTM D1748 - Test Method for Rust Protection by Metal Preservatives in the Humidity Cabinet
- ASTM G46 - Guide for Examination and Evaluation of Pitting Corrosion
- SAE-AMS-QQ-A-250/4, /5, /12, /13 - Aluminum Alloy plate and sheet specifications relevant for test coupon preparation
- MIL-A-8625 - Military specification for anodic coatings for aluminum and its alloys
Understanding and adhering to these interrelated standards helps ensure accurate, repeatable, and recognized sandwich corrosion test results throughout the aerospace sector.
Keywords: ASTM F1110, sandwich corrosion test, aircraft maintenance chemicals, aluminum alloy corrosion, aerospace industry standards, faying surfaces, corrosion severity rating, maintenance product qualification, material testing, ASTM standards.
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Frequently Asked Questions
ASTM F1110-09(2020) is a standard published by ASTM International. Its full title is "Standard Test Method for Sandwich Corrosion Test". This standard covers: SIGNIFICANCE AND USE 5.1 The data generated by this test method shall be used to determine whether aircraft structural aluminum alloys are liable to be corroded or damaged by application of the test material during routine maintenance operations. 5.2 Interpretation of the sandwich corrosion test results is based on a comparison of the appearance of faying surfaces of three sets of coupons. One set of test coupons is exposed with reagent water only in the faying surfaces, to establish the baseline (controls) against which the panels exposed to the test material are compared. Disregard corrosion at cut edges of the test coupons. 5.3 The relative corrosion severity rating system is provided in order to allow a numerical classification of the test results and to eliminate the necessity for elaborate weight loss measurements. Pitting corrosion, which is rated 4—extensive (severe) corrosion, may involve only a negligible weight loss. 5.4 Relative corrosion severity rating system: Appearance/Corrosion: 0—No visible corrosion and no discoloration present 1—Very slight corrosion or very slight discoloration, and/or up to 5 % of areaA corroded 2—Discoloration and/or up to 10 % of areaA corroded 3—Discoloration and/or up to 25 % of areaA corroded 4—Discoloration and/or more than 25 % of areaA corroded, and/or pitting present (A) ”Area” refers to area under the filter paper, or if no filter paper is used, the area where the test material was applied. SCOPE 1.1 This test method defines the procedure for evaluating the corrosivity of aircraft maintenance chemicals, when present between faying surfaces (sandwich) of aluminum alloys commonly used for aircraft structures. This test method is intended to be used in the qualification and approval of compounds employed in aircraft maintenance operations. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information. 1.3 This standard may involve hazardous materials, operations, and equipment. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements appear in Section 9. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
SIGNIFICANCE AND USE 5.1 The data generated by this test method shall be used to determine whether aircraft structural aluminum alloys are liable to be corroded or damaged by application of the test material during routine maintenance operations. 5.2 Interpretation of the sandwich corrosion test results is based on a comparison of the appearance of faying surfaces of three sets of coupons. One set of test coupons is exposed with reagent water only in the faying surfaces, to establish the baseline (controls) against which the panels exposed to the test material are compared. Disregard corrosion at cut edges of the test coupons. 5.3 The relative corrosion severity rating system is provided in order to allow a numerical classification of the test results and to eliminate the necessity for elaborate weight loss measurements. Pitting corrosion, which is rated 4—extensive (severe) corrosion, may involve only a negligible weight loss. 5.4 Relative corrosion severity rating system: Appearance/Corrosion: 0—No visible corrosion and no discoloration present 1—Very slight corrosion or very slight discoloration, and/or up to 5 % of areaA corroded 2—Discoloration and/or up to 10 % of areaA corroded 3—Discoloration and/or up to 25 % of areaA corroded 4—Discoloration and/or more than 25 % of areaA corroded, and/or pitting present (A) ”Area” refers to area under the filter paper, or if no filter paper is used, the area where the test material was applied. SCOPE 1.1 This test method defines the procedure for evaluating the corrosivity of aircraft maintenance chemicals, when present between faying surfaces (sandwich) of aluminum alloys commonly used for aircraft structures. This test method is intended to be used in the qualification and approval of compounds employed in aircraft maintenance operations. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information. 1.3 This standard may involve hazardous materials, operations, and equipment. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements appear in Section 9. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM F1110-09(2020) is classified under the following ICS (International Classification for Standards) categories: 49.025.99 - Other materials. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM F1110-09(2020) has the following relationships with other standards: It is inter standard links to ASTM G46-94(2013), ASTM D1748-10, ASTM D1748-02(2008), ASTM D1193-06, ASTM G46-94(2005), ASTM D1748-02, ASTM D1748-00, ASTM D1193-99e1, ASTM D1193-99, ASTM G46-94(1999). Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM F1110-09(2020) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F1110 − 09 (Reapproved 2020)
Standard Test Method for
Sandwich Corrosion Test
This standard is issued under the fixed designation F1110; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2.2 Industry Standards:
SAE-AMS-QQ-A-250/4Al Alloy 2024, Plate and Sheet
1.1 This test method defines the procedure for evaluating
SAE-AMS-QQ-A-250/5Al Alloy Alclad 2024, Plate and
thecorrosivityofaircraftmaintenancechemicals,whenpresent
Sheet
between faying surfaces (sandwich) of aluminum alloys com-
SAE-AMS-QQ-A-250/12Al Alloy 7075, Plate and Sheet
monlyusedforaircraftstructures.Thistestmethodisintended
SAE-AMS-QQ-A-250/13Al Alloy Alclad 7075, Plate and
to be used in the qualification and approval of compounds
Sheet
employed in aircraft maintenance operations.
2.3 Military Specification:
1.2 The values stated in SI units are to be regarded as the MIL-A-8625Anodic Coatings forAluminum andAlAlloys
standard. The values given in parentheses are for information.
3. Terminology
1.3 This standard may involve hazardous materials,
3.1 Definitions of Terms Specific to This Standard:
operations, and equipment. This standard does not purport to
3.1.1 sandwich corrosion test—a comparative accelerated
address all of the safety concerns, if any, associated with its
environmentaltestofthecorrosivityofliquidorsolidmaterials
use. It is the responsibility of the user of this standard to
present between faying surfaces of structural aluminum alloys
establish appropriate safety, health, and environmental prac-
commonly used in aerospace construction.
tices and determine the applicability of regulatory limitations
prior to use. Specific hazard statements appear in Section 9.
4. Summary of Test Method
1.4 This international standard was developed in accor-
4.1 Aluminum coupons having clad or anodized nonclad
dance with internationally recognized principles on standard-
surfaces are sandwiched together with a filter paper saturated
ization established in the Decision on Principles for the
with the test material between the coupons. The sandwiched
Development of International Standards, Guides and Recom-
coupons are cycled between warm ambient air and warm
mendations issued by the World Trade Organization Technical
humid air for 7 days. The coupons are then inspected to
Barriers to Trade (TBT) Committee.
determine whether corrosion more severe than that caused by
reagent water has occurred on the surfaces exposed to the test
2. Referenced Documents
material.This test method is used for solutions of dry granular
2.1 ASTM Standards: material or for liquid materials.
D1193Specification for Reagent Water
5. Significance and Use
D1748Test Method for Rust Protection by Metal Preserva-
tives in the Humidity Cabinet
5.1 The data generated by this test method shall be used to
G46Guide for Examination and Evaluation of Pitting Cor- determine whether aircraft structural aluminum alloys are
rosion liable to be corroded or damaged by application of the test
material during routine maintenance operations.
5.2 Interpretation of the sandwich corrosion test results is
This test method is under the jurisdiction of ASTM Committee F07 on based on a comparison of the appearance of faying surfaces of
Aerospace andAircraft and is the direct responsibility of Subcommittee F07.07 on
three sets of coupons. One set of test coupons is exposed with
Qualification Testing of Aircraft Cleaning Materials.
reagent water only in the faying surfaces, to establish the
Current edition approved Nov. 1, 2020. Published December 2020. Originally
approved in 1986. Last previous edition approved in 2014 as F1110–09(2014).
DOI: 10.1520/F1110-09R20.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from Society of Automotive Engineers (SAE), 400 Commonwealth
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Dr., Warrendale, PA 15096-0001.
Standards volume information, refer to the standard’s Document Summary page on Available from Department of Defense Single Stock Point (DODSSP); http://
the ASTM website. dodssp.daps.dla.mil
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1110 − 09 (2020)
baseline(controls)againstwhichthepanelsexposedtothetest 8.3 Unless otherwise specified, anodize the nonclad cou-
material are compared. Disregard corrosion at cut edges of the pons in accordance with Military Specification MIL-A-8625,
test coupons. Type 1 (Chromic Acid) followed by a hot water seal.
5.3 Therelativecorrosionseverityratingsystemisprovided
8.4 Filter Paper—Use Whatman No. 5 or equal filter paper
in order to allow a numerical classification of the test results
made from cellulose, 11 or 13 cm. Filter paper is not required
and to eliminate the necessity for elaborate weight loss
whenthematerialbeingtestedisasolid.Incasenofilterpaper
measurements. Pitting corrosion, which is rated 4—extensive
is used, the area covered by the test material shall also be
(severe) corrosion, may involve only a negligible weight loss.
approximately 25 by 75 mm (1 by 3 in.).
5.4 Relative corrosion severity rating system:
9. Hazards
Appearance/Corrosion:
0—No visible corrosion and no discoloration present
9.1 The materials used for aircraft maintenance sometimes
A
1—Very slight corrosion or very slight discoloration, and/or up to 5 % of area
corroded
contain flammable solvents, strong acids or alkalis, or other
A
2—Discoloration and/or up to 10 % of area corroded
toxiccompounds.Takesuitableprecautionstopreventpersonal
A
3—Discoloration and/or up to 25 % of area corroded
A
injury from these hazards. When the composition of the test
4—Discoloration and/or more than 25 % of area corroded, and/or pitting
present
material is not known, consult the manufacturer to determine
whether any hazards exist.
A
”Area” refers to area under the filter paper, or if no filter paper is used, the area
where the test material was applied.
9.2 Exercise special care in handling the chromic acid
solution, specified in 8.3, for its etching properties.
6. Interferences
6.1 It is possible that tap water containing large amounts of
10. Sampling
dissolvedsolids,especiallychlorides,willcauserelativesevere
10.1 Agitate or thoroughly mix the test material to assure
corrosion of the aluminum control panels. For this reason,
uniformity. Where dilution of the material is required, use
reagent water is specified. For comparative purposes, a set of
reagent water or the solvent specified by the product manufac-
aluminum test panels, with the locally available tap water
turer.Applysufficienttestmaterialtosaturatetheareabetween
applied to the filter paper, is sometimes run along with the
the metal coupons.
reagent water panels.
6.2 Filter paper made from glass fibers is not recommended
11. Test Specimen
since,inpractice,corrosionofthecontrolpanelshasoftenbeen
found. 11.1 Prepare three sets of test panels. A test panel set shall
consistofeightindividualtestcoupons,sandwichedtogetherin
7. Apparatus
pairs of coupons of the same alloy and the same surface
treatment,toprovidefourtestcouponsandwichesforeachtest
7.1 Humidity Test Cabinet, as specified in Test Method
D1748 or equal, capable of maintaining 95 to 100% relative condition. Identify each coupon by impression stamping or
other suitable permanent method.
humidity at 37.7 6 1°C (100 6 2°F).
7.2 Oven,forcedaircirculation,capableofmaintaining37.7
11.2 Clean the panels by solvent wiping, or vapor degreas-
6 1°C (100 6 2°F).
ing. Do not use acid or caustic cleaners. Remove ink stamped
markings from the panels. Do not use abrasive mat
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