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Study on the High Voltage Composite Anodization of Aluminum

Author: YuXiaoHui
Tutor: HuangGenLiang
School: Jiangsu University
Course: Materials Science
Keywords: aluminum composite anodization Al2O3 particles phosphoric acid
CLC: TG174.451
Type: Master's thesis
Year: 2007
Downloads: 150
Quote: 1
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Abstract


Anodization on the surface of aluminun is a sort of treatment technology of aluminum. It has been applied in many fields, such as mechanism, chemistry industry, electrical implement, light industry etc. At present, study on anodization of aluminum and its alloy already have been for a long time, so we want to break the tradition thought and take a new technique, then how to attain more excellent performance of anodized film of aluminum will become the new investigative direction.The content of this task is a new anodization that putting some submicron hard-dissolved particles in the acidity electrolyte to do the composite anodization, then will gain the film which contains some solid particles.Process composite anodization on the surface of aluminum with putting some Al2O3 particles in the phosphoric acid. Then analyse each factor which may affect the technics of composite anodization. The test prove that some factors may have effect on the composite anodization, such as anodization voltage, current density, mix round intensity, temperature, consistency of solid particles, along with surface active matter and so on. Those factors when them have been changed can alter the structure and property of film.Through analyse the property of film, such as the thickness （micro-rigidity, resistance erosion and so on） of the anodized film, we may make sure the best condition is that the adding quantity of Al2O3 particles is 1.0g/L, the temperature is 20℃, the average granularity of Al2O3 particles is 0.1μm and mixing rate is 1450r/min.Adoptting SEM instrument analyse the film of composite anodization. The result show that the aperture size of the composite anodization’s film is the same as that of the common anodization, the aperture present anomalous rotundity, the density of the aperture is higher, hole rate is smaller than that of the common anodization under same condition, and aperture is vertical with its surface. From this we can primarily discuss the mechanism of forming film in the process of composite anodization.The property of film is difference when with or without putting Al2O3 particles into the systerm. The anodized film’property of thickness, micro-rigidity and resistance erosion on NaOH all have been improved when putting into some Al2O3 particles, and the puncture voltage with adding Al2O3 particles is larger than the puncture voltage withnot adding （about 10 V）. Added to this, the results also present that the thickness and micro-rigidity of composite anodization’film is a little lower than that of horniness anodization’film when compare with horniness anodization, but after adding the solid particle with high rigidity, the rigidity and resistance abrasion of the film are all improved. Composite anodization have no use for strict technics condition as horniness anodization, especially it needs lower cost of energy and the cost, so it has a good application future.In the acid electrolyte, especially in the phosphoric acid, the composite anodization with adding tiny particles is a new treatment technology on the surface of aluminum and its alloy, at home the study on this aspect is less, so the paper about some work which have done on this aspect will give definite advantage on the spread of this new technology.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Inorganic complex layer of protection > Oxidation
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