Laser ultrasonic characterization of adhesive bonds between epoxy coating and aluminum substrate

Ultrasonics ◽  
2006 ◽  
Vol 44 ◽  
pp. e1349-e1353 ◽  
Author(s):  
H. Wang ◽  
M.L. Qian ◽  
W. Liu
Keyword(s):  
Epoxy Coating ◽  
Aluminum Substrate ◽  
Laser Ultrasonic ◽  
Adhesive Bonds ◽  
Ultrasonic Characterization

Ultrasonic Characterization of Thin Adhesive Bonds

1988 ◽  
Vol 142 ◽  
Author(s):  
P. Dickstein ◽  
A. N. Sinclairw ◽  
E. Segal ◽  
Y. Segal
Keyword(s):  
Adhesive Layer ◽  
Echo Signal ◽  
Adhesive Bonds ◽  
Water Ingress ◽  
Ultrasonic Characterization ◽  
Nominal Thickness ◽  
Frequency Peak ◽  
Bond Degradation ◽  
Ultrasonic Echo

AbstractA series of nondestructive and destructive tests were performed on samples of aluminumto-aluminum bonded plates. The specimens featured a range nominal thickness of the adhesive layer from 0.0 up to 0.5 mm. It was found that a commercial bondtester was inappropriate for assessing the thickness of the adhesive in this range. However, the frequency peak of an ultrasonic echo signal from the adhesive layer was a reliable indicator of bond thickness. It is proposed that nondestructive assessments of the bond thickness could serve as an indicator of the longterm resistance of the adhesive to water ingress and bond degradation.

Ultrasonic Characterization of Degradation of Aging Epoxy Coating

2004 ◽  
Vol 449-452 ◽  
pp. 1209-1212 ◽  
Author(s):  
Noh Yu Kim ◽  
Hwan Seon Nah
Keyword(s):  
Reflection Coefficient ◽  
Acoustic Impedance ◽  
Accelerated Aging ◽  
Ultrasonic Measurement ◽  
Epoxy Coating ◽  
Acoustic Lens ◽  
Ultrasonic Characterization ◽  
Aging Conditions

Acoustic impedance of aging epoxy coating in nuclear plant is measured for evaluation of the degradation of the epoxy coating using a new ultrasonic measurement technique that uses a specially designed conical acoustic lens to determine the reflection coefficient (reflectance) of the epoxy coating. Reflection waves measured at two different vertical positions slightly apart from each other are subtracted and used to calculate the acoustic impedance of the epoxy coating. Epoxy coated concrete specimens are fabricated and degraded artificially under accelerated aging conditions to determine the acoustic impedance of the films. Experimental results show that the acoustic impedance is very sensitive to the degradation of coating and can be applied to evaluate the quality of the epoxy coating quantitatively.

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