With the development of society and the advancement of technology, equipment manufacturers have higher and higher requirements for the internal quality and appearance of aluminum alloy shell parts. In order to meet the ever-increasing internal quality and appearance requirements, manufacturers have adopted various methods to improve the internal and external quality of aluminum alloy shell parts. In production practice, the external quality of aluminum alloy parts is often improved by anodizing surface treatment process.
After anodizing treatment, a layer of
anodic oxide film with a certain thickness, strength and beautiful appearance
can be formed on the surface of the aluminum alloy shell parts. Through
electron microscope observation, it can be found that the structure of the
anodic oxide film is honeycomb, and the center has a micropore that grows
perpendicular to the surface of the aluminum substrate, showing the beauty of
the shape that cannot be seen in other surface treatments. Then the anodic
oxide film is electrolytically colored and then sealed to obtain unique and
beautiful colors. The anodic oxidation film has stable performance and long-term
durability. Therefore, anodic oxidation is a common application in the current
production and processing of aluminum alloy shell parts.
The anodic oxidation process can form a
film with a certain thickness, strength and certain characteristics on the
surface of the aluminum alloy shell parts without changing the original shape
of the parts. In order to obtain a highly aesthetic appearance, it is required
that the surface of the parts before anodization be treated to a certain degree
of smoothness, and the surface should be clean and free of other impurities.
However, due to various factors in the anodizing process of aluminum alloy
shell parts, the oxide film appears uneven and the anodizing effect is not
ideal.
The research results show that the factors
that affect the quality of the anodic oxide film are as follows:
The influence of alloy chemical composition
in aluminum. In order to improve the mechanical properties and chemical
properties of aluminum alloys, a small amount of copper, silicon, and iron are
usually added to aluminum. After alkali etching treatment, aluminum is first
dissolved, while copper, silicon and iron are left on the surface to form
"ash", resulting in uneven anodic oxide film, affecting the
reflectivity, color and corrosion resistance of the oxide film.
The influence of foreign impurities in
aluminum. The "metallic bright lines", "end marks" and
"stripe marks" produced during rolling become obvious after
anodizing. The influence of the rolling process. After rolling, the grain size
and shape of aluminum change, and after alkali etching treatment, the surface
is rough due to preferential erosion, which affects the quality of the oxide
film.
The effect of heat treatment. Since the
failure treatment is mainly based on optimizing the mechanical properties, the
grain size changes greatly, which is not conducive to the production of a
uniform anodic oxide film.
The influence of the mold, the surface
roughness of the mold directly affects the surface roughness of the extruded
aluminum profile. Due to the defects and impurities of the aluminum alloy shell
parts before the anodization treatment, when the surface anodization treatment
is carried out, the surface current will be uneven, and the electrolyte flow
speed will vary, resulting in uneven surface treatment. State, formation and
obvious black stripes. Due to the presence of impurities on the surface of the
anodizing treatment, the anodic oxide film is not uniform, affecting the
reflectivity, color and corrosion resistance of the oxide film, and directly
affecting the quality of the anodizing treatment. Too high magnesium will
affect the transparency of the film; too high silicon will change the color of
the film from colorless and transparent to gray, purple and finally black. The color
is dark, not shiny, and reduces the bonding ability of the anodic oxide film
with the substrate, and cracks on the surface of the film.
Studies have shown that the aluminum alloy
shell parts themselves have streak defects and impurities, causing black
stripes in some places after anodized surface treatment, and the color is dark
and not shiny, which directly affects the appearance of the aluminum alloy
shell. Due to the presence of impurities in the aluminum alloy shell parts
before the treatment, they were not completely removed in time after the
alkaline washing. The "stripe" defects generated during the rolling
process were not completely removed during the polishing treatment, resulting
in the current failure during the surface anodizing treatment. Uniformity,
resulting in small black dots and streamlined stripes with a certain direction
of silver and black on the surface of the oxide film
In order to improve the surface quality of
aluminum alloy shell parts, while further optimizing the anodizing process, the
internal and external quality inspection of aluminum alloy shell parts before
oxidation treatment must be done, and the aluminum composition, rolling
production, heat treatment process and mold must be strictly controlled. The
quality of anodic oxidation provides good quality aluminum alloy shell parts,
which lays a solid foundation for ensuring the quality of anodic oxidation.
JY Machinery is an enterprise specializing
in the processing of aluminum alloy shell parts for a long time. It provides
design and production processing of aluminum alloy cavity shells, shells and
other parts. It has accumulated rich experience in CNC machining and anodizing.
Manufacturers in industries such as environmental protection and energy saving,
electronic appliances and automobiles provide high-quality supporting
processing services.
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