Strength and durability characteristics of aluminum joints bonded by rubber-modified and aluminum filled epoxy adhesive

(2006) Strength and durability characteristics of aluminum joints bonded by rubber-modified and aluminum filled epoxy adhesive. Masters thesis, King Fahd University of Petroleum and Minerals.


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The objective of this study was to develop information on the effects of moisture sorption and the filler content on the performance of aluminum joints bonded by rubber-modified and aluminum powder filled epoxy adhesive. Water and fluid immersion tests were utilized to determine the moisture sorption behavior of rubber-modified and aluminum filled epoxy adhesive under complete immersion in distilled water and NaCl solutions. The durability of the adhesive bonded metal joints was investigated by measuring the joint strength by the single lap shear test before and after exposure to three environments: distilled water, sea water and atmosphere. Moisture diffusion tests show that salt concentration of the exposure solution affects the maximum amount of moisture absorbed by epoxy type A with no rubber content (Lord 309). The lighter the concentration of NaCl solution, the less diffusant absorbed by that adhesive. On the other hand, there appears to be no significant effect of solution salt content on the maximum amount of moisture absorbed by epoxy type B with 40 wt% rubber content (RA-840). Epoxy type A absorbs larger amount of moisture than epoxy type B in distilled water and lightly concentrated salt solutions. However, the opposite is the case in highly concentrated salt solutions. Moisture diffusivity in the adhesive increases as the rubber content of the adhesive increases. Consequently, moisture diffusivity is higher in epoxy type B than epoxy type A. Solution salt content affects the moisture diffusivity in epoxy type A. The higher the salt content in the test solution, the faster the moisture diffusion rate in that adhesive. However, no significant effect of salt concentration on moisture diffusivity was observed in the case of epoxy type B. Moisture diffusivity in epoxy with 9 wt% rubber which is a mixture of both epoxy types is in between those in each epoxy type. Addition of aluminum particles into the adhesive decreases the amount of moisture absorbed by the adhesive. However, they do not affect the moisture diffusivity in the adhesive significantly. Mechanical characterization tests show that inclusion of aluminum filler in epoxy adhesive does not affect its adhesive strength and degradation characteristics. Rubber modification of epoxy, on the other hand, does not affect its adhesion strength if not exposed to detrimental environments. The adhesive strength does not degrade in the Gulf atmosphere for as long as 10 months. However, degradation of the epoxy adhesive with or without rubber content is significant in distilled water and sea water. Inclusion of rubber in the epoxy results in more significant degradation in distilled water. However, it has no significant effect on adhesive degradation in sea water.

Item Type: Thesis (Masters)
Subjects: Chemical Engineering
Department: College of Chemicals and Materials > Chemical Engineering
Committee Advisor: Kahraman, Ramazan
Committee Members: Loughlin, Kevin F. and Abu-Sharkh, Basel F. and Amin, Mohamed B. and Hussein, Ibnewaleed A.
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 14:06
Last Modified: 01 Nov 2019 14:01