Ⅰ: Anodized aluminum metal colors
In order to overcome the defects of surface hardness and wear resistance of aluminum alloys, expand the scope of application and prolong the service life, surface treatment technology has become an indispensable part of the use of aluminum alloys. Metal oxide films change the surface state and properties, such as surface coloration, improve corrosion resistance, enhance wear resistance and hardness, and protect metal surfaces.
Generally speaking, the anode is made of aluminum or aluminum alloy as the anode, and the cathode is selected from the lead plate, and the aluminum and lead plate are placed together in an aqueous solution, which contains sulfuric acid, oxalic acid, chromic acid, etc. An oxide film is formed on the surface. Anodizing usually refers to sulfuric acid anodizing unless otherwise specified.
If not colored. Ordinary anodizing below 20MU is white. If it is greater than 25, it will become gray and dark green
Anodized aluminum metal colors
First of all, electrophoresis treatment, the method of electrophoresis treatment can make industrial aluminum profiles have champagne color, silver white, stainless steel color, bronze color, as well as golden yellow, black, etc. Generally, it is silver white when the customer does not need it.
Then the surface color of the aluminum profile that can be obtained by the anodizing treatment method and the electrophoresis treatment method is relatively consistent. In recent years, anodized aluminum plate has gradually been widely used by the public as a new type of building decoration material.
Anodizing is an electrolytic process that forms an aluminum oxide onto the surface of the material. The oxide film that is formed grows from the base metal as an integral part of the material. Typically, 60% of the thickness builds into the material and 40% builds up. This oxide is hard; and is corrosion and abrasion resistant with excellent wear properties. The natural color of anodizing is typically light silver in appearance, but the coating can also be dyed to help meet customer color requirements. This coating is commonly referred to as Type II Anodizing. Dyed (Color) Anodizing will give your products a professional, yet attractive appearance. Huawei aluminum standard colors are Red, Blue, Black, Green and Gold. Others are available upon request.
Ⅱ: Anodized Aluminum Anodizing Process
Anodized aluminum refers to a layer of dense aluminum oxide coated on the surface of aluminum and aluminum alloys. In order to prevent further oxidation, its chemical properties are the same as aluminum oxide. But unlike ordinary oxide films, anodized aluminum can be dyed with electrolytic coloring. In terms of production, when the anode effect occurs, the temperature of the electrolyte rises sharply, from the normal value of 940°C to 955°C to 980°C to 990°C, the furnace side melts and becomes thinner, which increases the eroded carbon block on the side. possibility. The sharp rise in voltage makes the series current fluctuate and affects the output of the electrolyzer. Power consumption increases. The method of extinguishing the anode effect in production is: insert the effect rod (about 2 to 3 meters of branches with a diameter of 2 to 4 cm) into the aluminum liquid to burn the wooden rod to remove the gas film on the bottom of the anode, and clean the bottom of the anode, which is actually burning. The whole process of molten aluminum lasts about 3 to 5 minutes, and the electrochemical process of electrolysis is stopped at this time. As a result, serious loss of molten aluminum is caused. Take the 300KA intermediate blanking pre-baking tank as an example: the effect coefficient is 0.3 times/tank day, the effect time is 5min, the current efficiency is 93%, and one anode effect produces less primary aluminum: 300×0.3355×5÷60=8.4kg, per ton of aluminum Power consumption increased by 158kwh. Most of this energy is converted into heat energy in production, which causes the temperature between the electrodes of the electrolytic cell to rise sharply, and then conducts around the anode, which increases the temperature of the electrolytic cell and causes a large amount of volatilization of aluminum fluoride in the electrolyte. Therefore, the traditional anode effect method can no longer adapt to the production of modern electrolyzers. In the environmental aspect of aluminum electrolysis production, the anode effect is also accompanied by the generation of PFCs (CF4·C2F6) gas, which is destructive to the atmospheric ozone layer. Today's western developed countries have extremely strict environmental protection requirements for aluminum electrolysis.