ASTM F2111-01

Standard Practice for Measuring Intergranular Attack or End Grain Pitting on Metals Caused by Aircraft Chemical Processes

SCOPE
1.1 This practice covers the procedures for testing and measuring intergranular attack (IGA) and end grain pitting on aircraft metals and alloys caused by maintenance or production chemicals.
1.2 The standard does not purport to address all qualification testing parameters, methods, critical testing, or criteria for aircraft production or maintenance chemical qualifications. Specific requirements and acceptance testing along with associated acceptance criteria may be found where applicable in procurement specifications, materials specifications, or appropriate process specifications.
1.3 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: 09-Nov-2001
• ICS: 19.040 - Environmental testing
• ICS: 49.025.01 - Materials for aerospace construction in general
• Technical Committee: F07 - Aerospace and Aircraft
• Drafting Committee: F07.07 - Qualification Testing of Aircraft Cleaning Materials

Relations

• Replaced By: ASTM F2111-01a - Standard Practice for Measuring Intergranular Attack or End Grain Pitting on Metals Caused by Aircraft Chemical Processes
• Effective Date: 10-Nov-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: F 2111 – 01
Standard Practice for
Measuring Intergranular Attack or End Grain Pitting on
Metals Caused by Aircraft Chemical Processes
This standard is issued under the fixed designation F 2111; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 pit—a depression or cavity with a width to depth ratio
of <6 to 1.
1.1 This practice covers the procedures for testing and
3.1.3 short transverse (ST)—the shortest dimension perpen-
measuring intergranular attack (IGA) and end grain pitting on
dicular to the rolling or extruded direction of the extrusion in
aircraft metals and alloys caused by maintenance or production
the original shape.
chemicals.
3.1.4 surface roughness (R )—filtered mean line μin. (μm)
a
1.2 The standard does not purport to address all qualifica-
as defined in ASME B46.1, Surface Texture.
tion testing parameters, methods, critical testing, or criteria for
aircraft production or maintenance chemical qualifications.
4. Significance and Use
Specific requirements and acceptance testing along with asso-
4.1 If not properly qualified, chemicals and chemical pro-
ciated acceptance criteria may be found where applicable in
cesses can attack metals used during aircraft maintenance and
procurement specifications, materials specifications, or appro-
production. It is important to qualify only processes and
priate process specifications.
chemical formulas that do not have any deleterious effects on
1.3 This standard does not purport to address all of the
aircraft metallic skins, fittings, components, and structures.
safety concerns, if any, associated with its use. It is the
This test procedure is used to detect and measure intergranular
responsibility of the user of this standard to establish appro-
attack or pitting depth caused by aircraft maintenance chemical
priate safety and health practices and determine the applica-
processes, hence, this test procedure is useful in selecting a
bility of regulatory limitations prior to use.
process that will not cause intergranular attack or end grain
2. Referenced Documents pitting on aircraft alloys.
4.2 The purpose of this practice is to aid in the qualification
2.1 ASTM Standards:
2 or process conformance testing or production or maintenance
E 3 Practice for Preparation of Metallographic Specimens
chemicals for use on aircraft.
G 1 Practice for Preparing, Cleaning, and Evaluating Cor-
3 4.2.1 Some examples of maintenance and production
rosion Test Specimens
chemicals include: organic solvents, paint strippers, cleaners,
G 15 Terminology Relating to Corrosion and Corrosion
3 deoxidizers, water-based or semi-aqueous cleaners, or etching
Testing
solutions and chemical milling solutions.
G 46 Guide for Examination and Evaluation of Pitting
Corrosion
5. Apparatus and Materials
2.2 ASME Standard:
5.1 Metallurgical Microscope, capable of 5003 or greater
B46.1 Surface Texture (Surface Roughness, Waviness, and
4 magnification with scaled filar units in microscope eyepiece.
Lay)
5.2 Metallurgical Polishing Wheel, capable of polishing test
3. Terminology specimen to a surface finish of 5-μin. R or finer.
a
5.3 Noncorrosive Metallurgical Quality Polishing Media or
3.1 Definitions of Terms Specific to This Standard:
Compound, capable of polishing test specimens to 5-μin. R or
a
3.1.1 long transverse (LT)—the longest dimension perpen-
finer.
dicular to the rolling or extruded direction of the extrusion in
the original shape.
6. Test Specimens
6.1 Unless otherwise specified, manufacture test specimens
This practice is under the jurisdiction of ASTM Committee F07 on Aerospace as follows:
and Aircraft and is the direct responsibility of Subcommittee F07.07 on Qualifica-
6.1.1 Prepare at least one test specimen (or more when
tion Testing of Aircraft Cleaning Materials.
specified by applicable process specification) from plate, sheet,
Current edition approved May 10, 2001. Published July 2001.
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 03.02.
Available from American Society of Mechanical Engineers, Headquarters,
Three Park Ave., New York, NY 10016-5990.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
F 2111
extrusion, or hand forging as illustrated in Fig. 1. the grain direction as illustrated in Fig. 3.
6.1.2 Cut out metallurgical test specimen and polish Face A 7.6.1.3 Guide G 46 may be used as an alternate method to
to 0.812 μm (32 μin.) or preferably finer with polish as given evaluate pitting only.
in 5.3. 7.6.2 See Terminology G 15 for definitions of terminology
relating to corrosion and corrosion testing as a guidance
7. Procedure
document.
7.1 Expose entire polished specimen through normal pro-
8. Report
duction or maintenance cycle. Use t
...