The purpose of the present study was to evaluate the efficacy of pretreatment on the bonding durability between titanium casting and two acrylic adhesives. Cast titanium disk specimens treated with four polymer-metal bonding systems as follow: 1) air-abraded with 50-70 μm alumina, 2) 1)+Alloy Primer, 3) 1)+M.L. Primer and 4) tribochemical silica/silane coating system (Rocatec System). The specimens were bonded with M bond or Super-bond C&B adhesive. The shear bond strengths were determined before and after thermocycling (20,000 cycles). The surface characteristics after polishing, and for the 1) and 4) preparations were determined. The bond strengths for all combinations significantly decreased after thermocycling. The combination of Super-bond C&B adhesive and 2) led to significantly higher bond strength than the other preparations after thermocycling. The maximum height of the profile parameters for the polishing group was lower than other preparations.
Field observations were performed to understand the spatial and temporal variations of current and suspended solid in the sub-tidal and inter-tidal zone of Ariake Sea. The tidal currents are dominant in the sub-tidal and inter-tidal zone of Ariake Sea, while the wind has an important role on generating the residual currents. A large amount of sediment is suspended in the inter-tidal zone and the shallower region of sub-tidal zone due to the combined effect of tidal currents and wind waves. Large variations of Chlorophyll pigments concentration during the neap tide are induced in the sub-tidal zone due to the intrusion of Chlorophyll pigments from the offshore sub-surface layer.
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