ASTM D3482-07a(2023)

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: D3482 − 07a (Reapproved 2023)
Standard Practice for
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. Terminology
1.1 This practice covers the determination of whether an 3.1 Definitions—Definitions of terms in this test method
adhesive has any corrosive effect on copper. It is ordinarily may be found in Terminologies D907, D996, and G15.
intended to distinguish materials that might cause corrosion in 3.1.1 electrolytic corrosion, n—the corrosion of metal re-
electrical and electronic equipment. This procedure is a sub- sulting from current flow under an electrical potential in the
jective test for which precision and accuracy have not been presence of moisture.
established. It is not recommended for adhesives on backing.
4. Summary of Practice
1.2 The values stated in SI units are to be regarded as the
4.1 Two parallel helices of fine copper wire are laid in
standard. The values given in parentheses are for information
only. 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
1.3 This standard does not purport to address all of the
wired tube is exposed to high humidity with a d-c potential
safety concerns, if any, associated with its use. It is the
applied between the wires. Corrosion products are observed
responsibility of the user of this standard to establish appro-
visually.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- 5.1 Adhesives can be exposed to both electrical potential
ization established in the Decision on Principles for the and humidity in many electrical and electronic applications. It
Development of International Standards, Guides and Recom- is therefore desirable to provide a means of examining the
mendations issued by the World Trade Organization Technical corrosive tendencies of certain adhesives towards metals.
Barriers to Trade (TBT) Committee.
5.2 Although electrolytic corrosion is a direct result of ionic
conduction in the adhesive, the nature of the exposed metals
2. Referenced Documents
will have a bearing on both the severity of metal attack and the
2.1 ASTM Standards:
visibility of corrosion products. Because it gives a visual
D907 Terminology of Adhesives
indication of corrosion and because of its widespread use in
D996 Terminology of Packaging and Distribution Environ-
electrical circuits, copper is used in this practice. However, this
ments
would not preclude the use of other metals for specific
E104 Practice for Maintaining Constant Relative Humidity
interests.
by Means of Aqueous Solutions
5.3 This procedure is a subjective test in that determinations
G15 Terminology Relating to Corrosion and Corrosion Test-
3 of the presence of corrosion is based on a visual inspection for
ing (Withdrawn 2010)
a green discoloration or other evidence of corrosion.
This practice is under the jurisdiction ofASTM Committee D14 on Adhesives
6. Apparatus and Material
and is the direct responsibility of Subcommittee D14.80 on Metal Bonding
Adhesives. 6.1 Motor (Optional), low-speed, approximately 10 r/min
Current edition approved Jan. 1, 2023. Published January 2023. Originally
for winding wire helices.
approved in 1976. Last previous edition approved in 2014 as D3482 – 07a (2014).
DOI: 10.1520/D3482-07AR23. 6.2 Oven (or Temperature-Controlled Chamber),
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
circulating-air, or chamber controlled at 39.5 °C 6 1 °C (95 °F
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6 2 °F), unless otherwise specified.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
6.3 Battery, 45-V, or equivalent source of d-c power.
The last approved version of this historical standard is referenced on
www.astm.org. 6.4 Corrosion Test Apparatus—See Fig. 1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3482 − 07a (2023)
FIG. 2 Glass Tube
and insert the tube into a 16-mm ( ⁄8-in.) inside diameter by
13-mm ( ⁄2-in.) deep hole centered in the small end of a
neoprene stopper.
7.5 Makesolderconnectionsofthehelicallywoundwiresto
diametrically opposed connecting posts inserted in the neo-
prene stopper (Note 1). Clip excess wire from the opposite end
FIG. 1 Corrosion Test Apparatus
of the tube.
NOTE 1—Short lengths of 14-gauge tinned copper wire have worked
satisfactory as connecting posts.
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, 7.6 Apply two thin uniform applications of the test adhesiv
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