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Anodized aluminum plate

Date: 2019-05-07 10:25
Anodizing of aluminum
 
definition
 
Anodizing: Electrochemical oxidation of a metal or alloy. Aluminum and its alloys in the corresponding
Electrolyte and specific process conditions, with applied current
The role of forming an oxide film on the aluminum product (anode). Anodization generally means anodization, usually with sulfuric acid, unless otherwise stated.
 
What is the anodizing of aluminum?
The anodization of aluminum is a process of electrolytic oxidation. In the process, aluminum
And the surface of the aluminum alloy is usually transformed into a layer
An oxide film that protects, decorates, etc. Starting from the definition, the anodizing of aluminum only includes
The process of producing an anodized film.
 
 Why do you need anodization?
 In order to overcome the defects of surface hardness and wear resistance, expand the application range and prolong the service life, surface treatment technology is an essential step for the use of aluminum alloy. and
Anodizing technology is the most widely used and most successful.
 
 in principle:
Using a metal or alloy workpiece as the anode, using electrolysis
The method forms an oxide film on the surface. Metal oxide film changes the state and properties of the surface, such as surface coloring, improvement
Corrosion resistance, increased wear resistance and hardness, and protection of metals
surface. For example, the anodization of aluminum is
Under certain conditions and
The aluminum is placed in the corresponding electrolyte (for example, sulfuric acid, chromic acid, and oxalic acid) as an anode under the action of an applied current for electrolysis. Aluminum or an alloy is oxidized at the anode. Alumina formation
on the surface. The general thickness of the interior decorative film is 3~10μm, the appearance
The decoration is 15~25μm. The hard anodized film can reach a thickness of 40 to 200 μm.
The hardness and wear resistance of aluminum or aluminum alloy after anodizing increase to 220~500 kg / mm2;
Good properties, the hardness of the hard anodized film is as high as 2300K; good insulation,
Breakdown voltage resistance up to 2000V; improve corrosion resistance, in
There is no corrosion for thousands of hours in the slat fog of ω = 0.03NaCl. Many micropores on the thin layer of oxide film can absorb a variety of micropores
Lubricant for the manufacture of engine cylinders or other wear parts. The film can be colored
Beautiful and colorful colors with strong microporous adsorption capacity. Non-ferrous metal or its alloy
(such as aluminum, magnesium and its alloys) can be anodized. This method is extensive
Used in mechanical parts, aircraft and automotive parts, precision instruments, radio equipment, daily necessities
And architectural decoration.
 
 Anodizing function:
protection
decoration
Insulation
Improve adhesion to organic coatings.
Improve adhesion to inorganic coatings.
Other features in development
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