ASTM D3933-98(2004)

Standard Guide for Preparation of Aluminum Surfaces for Structural Adhesives Bonding (Phosphoric Acid Anodizing)

SIGNIFICANCE AND USE
Durable adhesive bonds between metal to metal, metal to composites can be obtained reliably only through proper selection and careful control of the materials used and the steps in the bonding process. The preparation of the metallic substrates to obtain surfaces with appropriate characteristics is a critical step. Improper surface preparation can produce seemingly acceptable bonds that can degrade rapidly with time. This guide describes one method on how to properly prepare aluminum surfaces can be obtained.
The formation of reproducible, durable, adhesive bonds in structural assemblies requires great care in the selection of materials, the preparation of the surfaces of the components to be bonded, the fit of the components, and the performance of the steps in the bonding process. Experience has shown that when adhesively bonded aluminum surfaces which have been prepared in accordance with this guide produce relatively reproducible, durable bonds.
SCOPE
1.1 This guide describes the requirements for phosphoric acid anodizing of aluminum and its alloys for structural adhesive bonding.
1.2 The procedure included herein is based on the commercial practice of numerous agencies and organizations. The method may be revised or supplemented, as necessary, to include methods based on proven performance.
1.3 The surface preparation of metal systems used for qualification and quality-control testing of the adhesive should be agreed upon between the manufacturer and the user.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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. A specific precaution is given in 5.5.

General Information

• Status: Historical
• Publication Date: 31-Mar-2004
• Technical Committee: D14 - Adhesives
• Drafting Committee: D14.80 - Metal Bonding Adhesives

Relations

• Replaces: ASTM D3933-98 - Standard Guide for Preparation of Aluminum Surfaces for Structural Adhesives Bonding (Phosphoric Acid Anodizing)
• Effective Date: 01-Apr-2004
• Replaced By: ASTM D3933-98(2010) - Standard Guide for Preparation of Aluminum Surfaces for Structural Adhesives Bonding (Phosphoric Acid Anodizing)
• Effective Date: 01-Oct-2010
• Referred By: ASTM D3165-07(2023) - Standard Test Method for Strength Properties of Adhesives in Shear by Tension Loading of Single-Lap-Joint Laminated Assemblies
• Effective Date: 01-Apr-2004
• Referred By: ASTM D2651-01(2016) - Standard Guide for Preparation of Metal Surfaces for Adhesive Bonding
• Effective Date: 01-Apr-2004
• Referred By: ASTM D7234-22 - Standard Test Method for Pull-Off Strength of Coatings on Concrete Using Portable Pull-Off Adhesion Testers
• Effective Date: 01-Apr-2004
• Referred By: ASTM D4541-22 - Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers
• Effective Date: 01-Apr-2004
• Referred By: ASTM D6465-99(2016) - Standard Guide for Selecting Aerospace and General Purpose Adhesives and Sealants
• Effective Date: 01-Apr-2004

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:D3933–98(Reapproved2004)
Standard Guide for
Preparation of Aluminum Surfaces for Structural Adhesives
1
Bonding (Phosphoric Acid Anodizing)
This standard is issued under the fixed designation D3933; 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 3. Terminology
1.1 This guide describes the requirements for phosphoric 3.1 Definitions—Many terms in this guide are defined in
acid anodizing of aluminum and its alloys for structural Terminology D907.
adhesive bonding.
4. Significance and Use
1.2 The procedure included herein is based on the commer-
cial practice of numerous agencies and organizations. The 4.1 Durable adhesive bonds between metal to metal, metal
to composites can be obtained reliably only through proper
method may be revised or supplemented, as necessary, to
include methods based on proven performance. selectionandcarefulcontrolofthematerialsusedandthesteps
in the bonding process. The preparation of the metallic
1.3 The surface preparation of metal systems used for
qualification and quality-control testing of the adhesive should substrates to obtain surfaces with appropriate characteristics is
a critical step. Improper surface preparation can produce
be agreed upon between the manufacturer and the user.
1.4 The values stated in SI units are to be regarded as the seeminglyacceptablebondsthatcandegraderapidlywithtime.
This guide describes one method on how to properly prepare
standard. The values given in parentheses are for information
only. aluminum surfaces can be obtained.
4.2 The formation of reproducible, durable, adhesive bonds
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the in structural assemblies requires great care in the selection of
materials, the preparation of the surfaces of the components to
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- be bonded, the fit of the components, and the performance of
the steps in the bonding process. Experience has shown that
bility of regulatory limitations prior to use. A specific precau-
when adhesively bonded aluminum surfaces which have been
tion is given in 5.5.
prepared in accordance with this guide produce relatively
2. Referenced Documents
reproducible, durable bonds.
2
2.1 ASTM Standards:
5. Apparatus
D907 Terminology of Adhesives
5.1 Locate surface preparation and drying facilities separate
D2651 Guide for Preparation of Metal Surfaces for Adhe-
sive Bonding from other activities or equipment, or both, to preclude
contamination by substances detrimental to adhesion.
2.2 Federal Specifications:
3
0-0-670 Orthophosphoric Acid, Technical 5.2 Facilities should be arranged such that parts can flow
from the beginning of surface preparation to the priming
operation without being touched.
5.3 Filtersortraps,orboth,shouldbeinstalledforremoving
1
ThisguideisunderthejurisdictionofASTMCommitteeD14onAdhesivesand
airborne dust, moisture, and oil from all air lines or ducts used
is the direct responsibility of Subcommittee D14.80 on Metal Bonding Adhesives.
Current edition approved April 1, 2004. Published April 2004. Originally for solution agitation and parts drying. Periodically check,
approved in 1980. Last previous edition approved in 1998 as D3933 – 98. DOI:
clean, or replace filters to ensure proper operation.
10.1520/D3933-98R04.
5.4 Surface preparation facilities should not be used for
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
purposes other than the preparation of parts for adhesive
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
bonding and subsequent finishing.
the ASTM website.
5.5 Equipment requirements for this process include equip-
3
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
ment normally used in the chemical processing of aluminum
732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
www.access.gpo.gov. alloys, with the following special provisions:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3933–98 (2004)
5.5.1 Racks and frames that are electrically anodic shall be 6.4 If parts become contaminated, either prior to or subse-
constructed of materials that will not cause corrosive reactions quent to anodizing, corrective action shall be accomplished by
with the susp
...