Electrochemical oxidation of metals or alloys.
The metal or alloy part is used as an anode, and an oxide film is formed on the surface by electrolysis. The metal oxide film changes the surface state and properties such as surface coloration, improves corrosion resistance, enhances wear resistance and hardness, and protects metal surfaces. For example, anodization of aluminum, aluminum and its alloys placed in the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as an anode, under specific conditions and the role of the applied current, electrolysis. Anodized aluminum or its alloy is oxidized, a thin layer of aluminum oxide is formed on the surface, its thickness is 5 to 20 micrometers, and the hard anodized film can reach 60 to 200 micrometers. After anodized aluminum or its alloys, improve its hardness and wear resistance, up to 250 ~ 500 kg/mm2, good heat resistance, hard anodized film melting point up to 2320K, excellent insulation, resistance to fire With a voltage of up to 2000V, the anti-corrosion properties are enhanced, and no corrosion occurs for thousands of hours in the ω=0.03NaCl salt spray. Oxide film has a large number of micro-holes in the thin layer, can absorb a variety of lubricants, suitable for the manufacture of engine cylinders or other wear parts; membrane porous adsorption capacity can be colored into a variety of beautiful and beautiful colors. Non-ferrous metals or their alloys (such as aluminum, magnesium, and their alloys) can be anodized. This method is widely used in mechanical parts, aircraft parts, precision instruments and radio equipment, daily necessities, and architectural decoration. Why Anodic Oxidation: In order to overcome the defects in surface hardness and wear resistance of aluminum alloys, to extend the application range and prolong the service life, the surface treatment technology becomes an indispensable part in the use of aluminum alloys, and the anodizing technology is currently applied. Broader and more successful. What is anodization of aluminum: The so-called anodization of aluminum is an electrolytic oxidation process in which the surface of aluminum and aluminum alloys is generally converted into an oxide film, which is protective, decorative, and some Other features. The anodization of aluminum from this definition includes only the process of forming anodized film