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LSSER INDUCED RESCTION FOR FHEBOND SURFACE
PREPJR1TI0N OF ALUHINUH 3LL0YS
Stage X Report (5-6/93)
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1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 27 June 3. REPORT TYPE AND DATES COVERED May-June 1993
4. TITLE AND SUBTITLE Laser Induced Reaction for Prebond Surface
Preparation of Aluminum Alloys. Stage 1.
5. FUNDING NUMBERS F61708-93-
6. AUTHOR(S) Rotel, M.; Zahavi, J. ; Buchman, A.; Dodiuk, H.
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
8. PERFORMING ORGANIZATION
Israel Institute of Metals
Technion Research and
Development Foundation Ltd.
Materials and Processes Dept.
9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)
PSC802 Box 14
10. SPONSORING / MONITORING
AGENCY REPORT NUMBER
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I 9 990 2160 6 3
Standard Form 298 (Rev. 2-89)
Prescribed by ANSI Std. Z39-18 298-102
LASER INDUCED REACTION FOR PREBOND SURFACE
PREPARATION OF ALUMINUM ALLOYS
Stage I Report (5-6/93)
Contract No. F61708-93-C005
M. Rotel, J. Zahavi
Israel Institute of Metals, Technion, Haifa, Israel
A. Buchman, H. Dodiuk
Materials and Processes Department,
RAFAEL, Haifa, Israel
Haifa, June 27, 1993
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The potential of UV lasers for prebonding treatment of Al-2024
alloy was proved in a previous investigation  with a
modified epoxy adhesive.
Surface treatment of A1 by excimer laser results in oxidation
and morphological changes of the surface promoting high shear
adhesion strength at optimal laser conditions. The objective
of this research is to establish the effect of excimer ArF UV
laser on the A1 alloy surface microstructure and chemical
activity and its correlation with the macro behaviour of shear
and peel strength and failure locus of adhesively bonded
joints using structural adhesives for structural and repair
The first stage of this research (OGGI of the contract) is
summarized in this report. This stage includes the preparation
of all A1 specimens with required configurations for the
Adhesives and Primer
3 kinds of structural adhesives for various service
temperatures and their primer were ordered. The details of the
adhesives and the primer are given in Table 1.
Table 1: The structural adhesives and the primer
1 Hr. 120°C
-55°C to +120°C
-55°C to +175°C
-65°C to +177°C
l/2Hr. 121 C
-55°C to +177°C
All adhesives and the primer will pass quality control tests
including epoxy content, solid content, volatiles and percent
of fluency, before application.
Four kinds of A1 2024 adherends were prepared:
1- Single lap shear adherends (see Fig. 1) according to ASTM
25 X 100X 1.6 mm (2 for each sample).
Peel adherends according to ASTM D-3167 (see Fig. 2).
25 X 250 X 1.6 mm (rigid).
25 X 250 X 0,5 mm (flexible).
(One of each for each sample).
Tensile adherends according to ASTM C-297
(Flat wise, FW)
37 X 37 X 37 mm with a central penetrating, hole
(described in Fig. 3)
(2 for each sample).
4- Wedge adherends
According to ASTM D-3762
25 X 250 X 1.6 mm
(2 for each sample + a wedge).
The sample is described in Fig. 4.
I 6 mm
63.5 mm- -63.5 mm —
- 1271 L mm-*1
-177.8 t L mm-
Fig. 1: SLS adherends.
ALUMINUM OR STAINLESS STEEL WEDGE
j—-1 Q "±0.03 —.
l - 1
Fig. 4: Wedge test adherend.
Amount and Kinds of Samples
Two kinds of references will be used in all experiments for
comparison with laser treated specimens. A non-treated A1
sample. An unsealed chromic acid anodized A1 sample
SLS adherends will be tested at various laser parameters + 2
references in order to establish the optimal laser conditions.
Peel, tensile and wedge tests will be produced at optimal
laser conditions only + 2 references.
The total amount of sample sets prepared are summarized in
Anodization treatment for the reference adherends will be
performed as close as possible to the adhesion stage.
Table 2: Number of sets needed for the various tests
Peel Tensile Wedge
( 1 ) ( 1 ) ( 2 )
(1) Each set = 5 samples
(2) Each set = 3 samples
The total amount of samples prepared are:
All adherends for the various tests were prepared. Adhesives
and primer were ordered and will be QI tested when received.
Task No. GG01 was completed.
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