ASTM D3482-07a

Standard Practice for Determining Electrolytic Corrosion of Copper by Adhesives

SIGNIFICANCE AND USE
Adhesives can be exposed to both electrical potential and humidity in many electrical and electronic applications. It is therefore desirable to provide a means of examining the corrosive tendencies of certain adhesives towards metals.
Although electrolytic corrosion is a direct result of ionic conduction in the adhesive, the nature of the exposed metals will have a bearing on both the severity of metal attack and the visibility of corrosion products. Because it gives a visual indication of corrosion and because of its widespread use in electrical circuits, copper is used in this practice. However, this would not preclude the use of other metals for specific interests.
This procedure is a subjective test in that determinations of the presence of corrosion is based on a visual inspection for a green discoloration or other evidence of corrosion.
SCOPE
1.1 This practice covers the determination of whether an adhesive has any corrosive effect on copper. It is ordinarily intended to distinguish materials that might cause corrosion in electrical and electronic equipment. This procedure is a subjective test for which precision and accuracy have not been established. It is not recommended for adhesives on backing.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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: 30-Sep-2007
• ICS: 83.180 - Adhesives
• Technical Committee: D14 - Adhesives
• Drafting Committee: D14.80 - Metal Bonding Adhesives

Relations

• Replaces: ASTM D3482-07 - Standard Practice for Determining Electrolytic Corrosion of Copper by Adhesives
• Effective Date: 01-Oct-2007

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation: D3482 − 07a
Standard Practice for
1
Determining Electrolytic Corrosion of Copper by Adhesives
This standard is issued under the fixed designation D3482; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 3.1.1 electrolytic corrosion, n—the corrosion of metal re-
sulting from current flow under an electrical potential in the
1.1 This practice covers the determination of whether an
presence of moisture.
adhesive has any corrosive effect on copper. It is ordinarily
intended to distinguish materials that might cause corrosion in
4. Summary of Practice
electrical and electronic equipment. This procedure is a sub-
jective test for which precision and accuracy have not been 4.1 Two parallel helices of fine copper wire are laid in
etched grooves on a glass tube.The adhesive material is coated
established. It is not recommended for adhesives on backing.
over the wires and the tube and then allowed to set or cure.The
1.2 The values stated in SI units are to be regarded as the
wired tube is exposed to high humidity with a d-c potential
standard. The values given in parentheses are for information
applied between the wires. Corrosion products are observed
only.
visually.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 Adhesives can be exposed to both electrical potential
priate safety and health practices and determine the applica-
and humidity in many electrical and electronic applications. It
bility of regulatory limitations prior to use.
is therefore desirable to provide a means of examining the
corrosive tendencies of certain adhesives towards metals.
2. Referenced Documents
5.2 Although electrolytic corrosion is a direct result of ionic
2
2.1 ASTM Standards:
conduction in the adhesive, the nature of the exposed metals
D907 Terminology of Adhesives
will have a bearing on both the severity of metal attack and the
D996 Terminology of Packaging and Distribution Environ-
visibility of corrosion products. Because it gives a visual
ments
indication of corrosion and because of its widespread use in
E104 Practice for Maintaining Constant Relative Humidity
electrical circuits, copper is used in this practice. However, this
by Means of Aqueous Solutions
would not preclude the use of other metals for specific
G15 Terminology Relating to Corrosion and Corrosion Test-
interests.
3
ing (Withdrawn 2010)
5.3 This procedure is a subjective test in that determinations
of the presence of corrosion is based on a visual inspection for
3. Terminology
a green discoloration or other evidence of corrosion.
3.1 Definitions—Definitions of terms in this test method
may be found in Terminologies D907, D996, and G15.
6. Apparatus and Material
6.1 Motor (Optional), low-speed, approximately 10 r/min
for winding wire helices.
1
This practice is under the jurisdiction ofASTM Committee D14 on Adhesives
and is the direct responsibility of Subcommittee D14.80 on Metal Bonding
6.2 Oven (or Temperature-Controlled Chamber),
Adhesives.
circulating-air, or chamber controlled at 39.5 6 1°C (95 6
Current edition approved Oct. 1, 2007. Published November 2007. Originally
2°F), unless otherwise specified.
approved in 1976. Last previous edition approved in 2007 as D3482 – 07. DOI:
10.1520/D3482-07A.
6.3 Battery, 45-V, or equivalent source of d-c power.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.4 Corrosion Test Apparatus—See Fig. 1.
Standards volume information, refer to the standard’s Document Summary page on
6.4.1 Helically Etched Glass Tubing—See Fig. 2.
the ASTM website.
3
6.4.2 Wire, No. 36 Awg, 0.13 mm (0.005 in.) in diameter,
The last approved version of this historical standard is referenced on
www.astm.org. OFHC (Oxygen-Free High-Conductivity) bare copper wire.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
D3482 − 07a
1
6.4.3 Test Tube, borosilicate glass, 32 mm (1 ⁄2 in.) in
outside diameter, 200 mm (8 in.) long.
6.4.4 Rubber Stopper, No. 6, neoprene.
6.5 Miscellaneous—Soldering
...

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:D3482–07 Designation: D 3482 – 07a
Standard Practice for
1
Determining Electrolytic Corrosion of Copper by Adhesives
This standard is issued under the fixed designation D 3482; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1 This practice covers the determination of whether an adhesive has any corrosive effect on copper. It is ordinarily intended
to distinguish materials that might cause corrosion in electrical and electronic equipment. This procedure is a subjective test for
which precision and accuracy have not been established. It is not recommended for adhesives on backing.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 907 Terminology of Adhesives
D 996 Terminology of Packaging and Distribution Environments
E 104 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions
G 15 Terminology Relating to Corrosion and Corrosion Testing
3. Terminology
3.1 Definitions—Definitions of terms in this test method may be found in Terminologies D 907, D 996, and G 15.
3.1.1 electrolytic corrosion, n—the corrosion of metal resulting from current flow under an electrical potential in the presence
of moisture.
4. Summary of Practice
4.1 Two parallel helices of fine copper wire are laid in etched grooves on a glass tube. The adhesive material is coated over the
wires and the tube and then allowed to set or cure.The wired tube is exposed to high humidity with a d-c potential applied between
the wires. Corrosion products are observed visually.
5. Significance and Use
5.1 Adhesives can be exposed to both electrical potential and humidity in many electrical and electronic applications. It is
therefore desirable to provide a means of examining the corrosive tendencies of certain adhesives towards metals.
5.2 Although electrolytic corrosion is a direct result of ionic conduction in the adhesive, the nature of the exposed metals will
have a bearing on both the severity of metal attack and the visibility of corrosion products. Because it gives a visual indication
of corrosion and because of its widespread use in electrical circuits, copper is used in this practice. However, this would not
preclude the use of other metals for specific interests.
5.3 This procedure is a subjective test in that determinations of the presence of corrosion is based on a visual inspection for a
green discoloration or other evidence of corrosion.
6. Apparatus and Material
6.1 Motor (Optional), low-speed, approximately 10 r/min for winding wire helices.
1
This practice is under the jurisdiction of ASTM Committee D14 on Adhesives and is the direct responsibility of Subcommittee D14.80 on Metal Bonding Adhesives .
CurrenteditionapprovedMayOct.1,2007.PublishedMayNovember2007.Originallyapprovedin1976.Lastpreviouseditionapprovedin20002007asD3482–90(2000).
D 3482 – 07.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D 3482 – 07a
6.2 Oven (or Temperature-Controlled Chamber), circulating-air, or chamber controlled at 39.5 6 1°C (95 6 2°F), unless
otherwise specified.
6.3 Battery, 45-V, or equivalent source of d-c power.
6.4 Corrosion Test Apparatus—See Fig. 1.
6.4.1 Helically Etched Glass Tubing —See Fig. 2.
6.4.2 Wire, No. 36 Awg, 0.13 mm (0.005 in.) in diameter, OFHC (Oxygen-Free High-Conductivity) bare copper wire.
1
6.4.3 Test Tube, borosilicate glass, 32 mm (1 ⁄2 in.) in outside diameter, 200 mm (8 in.) long.
6.4.4 Rubber Stopper, No. 6, neoprene.
6.5 Miscellaneous— Soldering iron
...