The use of the aluminum alloys is experiencing new field, from the automotive and building to IC industries. One of the major treatments to which these alloys are submit is anodizing, an electrolytic process in which aluminum is converted into aluminum a continuous anodic oxidation method for aluminum, comprising continuously feeding a sulfuric acid solution into a device consisting of a hollow container having a cathode, at least one inlet port, a discharge port, and a liquid-permeable material covering said discharge port, through said inlet port and discharging the same from said discharge port through said liquid-permeable material at a rate of about 0.67 1./cm. /cm. /min.: passing band or rod-shaped aluminum along the surface of said liquid-permeable material in opposed relation thereof; and impressing a voltage across said cathode and said aluminum at a current density of about 200600 amps/ m at about 30 C., whereby the surface of said aluminum is oxidized by anodic oxidation.A continuous anodic oxidation method for aluminum according to claim 1 wherein said device is provided on one side of said aluminum band and cooling liquid is poured onto the surface of the aluminum band opposite to the surface of same facing said device.A continuous anodic oxidation method for aluminum according to the method of claim 1 wherein two of said devices are provided, one on each side of said aluminum band at points removed from each other so that said two devices are not opposed to each other.A continuous anodic oxidation method for aluminum, as defined in claim 1, wherein a plurality of said devices and a plurality of cooling liquid pouring devices are arranged alternately on at least one side of the aluminum along the direction of travel of the aluminum.A continuous anodic oxidation method for aluminum, as defined in claim 1, wherein at least one device which discharges the electrolyte at a relatively high temperature and at least one cathode device which discharges the electrolyte at a relatively low temperature are alternately arranged along the direction of travel of the aluminum.A continuous anodic oxidation method for aluminum according to claim 1 wherein said discharge port is in the side of said container and said band or rod-shaped aluminum is passed vertically along the surface of said liquid-permeable material in opposed relation thereto.A continuous anodic oxidation method according to claim 1 wherein said liquid-permeable material is an acidresistant metal screen, an ethylene tetrafluride fabric or a polypropylene fabric having a mesh size of from 0.01 to 1 mm.


The effect of different Mg/Si and Mn content on uniformity and consistence of anodic films of 6061 aluminum alloy was investigated by using hardness test,coating thickness test, optical microscopy (OM),scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results show that when Mg/Si is in the vicinity of 1.73 and Mn content is 0.14%, the uniformity of the anodic film is the best while the consistence of the anodic film is the best when Mg/Si is 1.88 and Mn content is 0.14%. Superfluous silicon and magnesium have a bad function on the uniformity of anodic films of 6061 aluminum alloy because of secondary phases but magnesium in the base material can be beneficial for the consistence of the anodic film due to formation of a protective, impermeable layer of MgO below the anodic film while plentiful excess silicon result in single Si and w(Cu4Mg5Si4Alx) to gather in the grain boundary, which makes rarefactions and discontinuity present. The uniformity and consistence of anodic films are improved by Mn content rising, which is caused by the decrease of needle-like Fe-rich and Mg2Si phases and the increase of bone-like Fe-rich phases. 


Aluminum Alloys There Of Continuous Anodic Oxidation Method                               

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