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The anodized aluminium layer is grown by passing a direct current through an electrolytic solution, with the aluminium object serving as the anode (the negative electrode). The current releases hydrogen at the cathode (the positive electrode) and oxygen at the surface of the aluminium anode, creating a build-up of aluminium oxide. Alternating current and pulsed current is also possible but rarely used. The voltage required by various solutions may range from 1 to 300 V DC, although most fall in the range of 15 to 21 V. Higher voltages are typically required for thicker coatings formed in sulfuric and organic acid. The anodizing current varies with the area of aluminium being anodized and typically ranges from 30 to 300 A/m2 (2.8 to 28 A/ft2).Aluminum custom cnc machining parts Supplier
Aluminium anodizing is usually performed in an acid solution, which slowly dissolves the aluminium oxide. The acid action is balanced with the oxidation rate to form a coating with nanopores, 10–150 nm in diameter. These pores are what allow the electrolyte solution and current to reach the aluminium substrate and continue growing the coating to greater thickness beyond what is produced by autopassivation. However, these same pores will later permit air or water to reach the substrate and initiate corrosion if not sealed. They are often filled with colored dyes and/or corrosion inhibitors before sealing. Because the dye is only superficial, the underlying oxide may continue to provide corrosion protection even if minor wear and scratches may break through the dyed layer.
Conditions such as electrolyte concentration, acidity, solution temperature, and current must be controlled to allow the formation of a consistent oxide layer. Harder, thicker films tend to be produced by more dilute solutions at lower temperatures with higher voltages and currents. The film thickness can range from under 0.5 micrometers for bright decorative work up to 150 micrometers for architectural applications.
Q: Are you factory or trading company?
A: We are factory.
Q: What’s the material of your product?
A: We mainly use steel alloy and high quality 7075 aluminum alloy with multi choices of surface treatment: Zinc plated ( four colors: white,yellow,colorful,black), chrome plated,nickle plated, electrophoresis EP (black), powder- coated,galvanizing, dip plastic, anodizing and dacromet ect.
Q: What’s the function of heat-treatment?
A: The main function of heat-treatment is to adjust the internal structure of steel alloy which enhance the tensile hardness of it.
Q: Do you offer OEM&ODM services?
A: Yes, OEM,ODM is welcomed, all of our products support convinient customization.
Q: What’s your terms of payment?
A: We appreciate payment by T/T and Paypal.
Q: Can your product ensure personal safety?
A: We are an ISO9001:2008 certified company, many of our products are CE certified which ensures high quality.