The regularities of changes in the residual protective effect of o-hydroxyazomethine derivatives on the acid corrosion of Al have been studied. The duration of the residual protective effect (τ) is a function of the polarity of substituents in o-hydroxyazomethine molecules, inverse temperature of the solution, and the additive concentration in the preadsorption solution. The identified regularities of the effect of these factors on τ is interpreted in terms of the Linear Free Energy Relationship approach. The changes in the near-electrode concentration of a desorbed inhibitor as a function of time and solution temperature are discussed. It is noted that the effects of various factors on the regularities of changes in the residual protective effect of o-hydroxyazomethine derivatives toward Al and Fe corrosion are similar.
High efficiency LED device is being concerned due to its high heat loss, and such heat loss will cause a shorter lifespan and lower efficiency. Since there is a demand for the materials that can release heat quickly into the external air, the organic insulating layer was required to be replaced with high thermal conductive materials such as metal or ceramics. Through anodizing the upper layer of Al, the Breakdown Voltage of 3kV was obtained by using an uniform thickness of 60 µm aluminum oxide(Al 2 O 3 ) and was carried out to determine the optimum process conditions when thermal cracking does not occur. Two Ni layers were formed above the layer of Al 2 O 3 by sputtering deposition and electroplating process, and saccharin was added for the purpose of minimizing the remain stress in electroplating process. The results presented that the 3-layer film including the Ni layer has an adhesive force of 10N and the thermal conductivity for heat dissipation is achieved by 150W/mK level, and leads to improvement about 7 times or above in thermal conductivity, as opposed to the organic insulation layer.
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