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The effect of time and type of water pretreatment on the bond strength of epoxy–aluminum joints
Author(s) -
McCarvill W. T.,
Bell J. P.
Publication year - 1974
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1974.070180202
Subject(s) - distilled water , tap water , bond strength , materials science , composite material , epoxy , surface roughness , chemistry , adhesive , chromatography , layer (electronics) , environmental engineering , engineering
The bond strength of unetched aluminum–epoxy joints induced by tap and distilled water pretreatment at 10°C increased to a maximum, then decreased as a function of immersion time. In distilled water, the maximum bond strength occurs after an immersion time of about 1 hr, after which the bond strength decreases. In the case of tap water pretreatment, the maximum bond strength occurred at about 12 hr of immersion time. The bond strengths at the maxima found for the tap water‐pretreated samples were greater than those found at the maxima for the joints pretreated in distilled water. Growth of the hydrated oxide bayerite is proposed as the controlling factor; the bayerite grows more rapidly and less perfectly in distilled water than in tap water. Thick layers of bayerite are structurally weak, while thin layers seem to promote adhesion. A slight surface roughness effect was also observed.