The so-called anode, relative to the principle of electroplating, is to be placed in the object in the anode, so that its oxidation, the formation of oxide film, due to the aluminum oxide film structure is careful, good adsorption, not easy to fall off, so artificial way to cover a layer of careful oxide film to protect it will not continue to oxidation, this is the use of the anode.
The anodic treatment of aluminum is the formation of a layer of oxide film on the surface of aluminum metal by the action of electric current, hard and wear-resistant, high corrosion resistance, beautiful color. Aluminum alloy itself is easy to process, высокая прочность, a wide range of uses, used in aluminum doors and Windows, furniture, camera and instrument shell. Aluminum manufacturing and processing industry is also expanding, aluminum Yang treatment has considerable market potential.
The development of anodic treatment such as hard anodizing can also be used for ac and DC anodizing at low temperature. This hardened anodized aluminum can be used for pistons, cylinders, cylinder linings, hydraulic and turbine parts, steam valves, gears, gun parts, clutches, brake discs, machine tools, и т. д.. Automatic control of bath temperature, current density and solution composition is required to strictly control the quality of finished products to meet customer requirements. Automation needs to introduce foreign technology and a large amount of capital, so at the same time to understand the potential of foreign markets to achieve automation step by step.
Electroplating principle
Electroplating is an electrolysis process in which a sheet of metal that provides a coating acts as an anode and the electrolyte, usually a solution of ions coated with the metal, acts as a cathode. After the input voltage between the anode and cathode, the metal ions in the electrolyte are attracted to swim to the cathode, which is plated on it after reduction.
At the same time the anode metal redissolves, providing the electrolyte with more metal ions. In some cases, insoluble anodes are used and new electrolytes are added to supplement the metal ions
