On the China Aluminum Network, it is well known that the composition and heat treatment of aluminum and its alloys significantly impact the appearance and quality of the anodized film. For instance, when using sulfuric acid for anodizing, aluminum alloys with high copper content tend to produce a more porous and uneven oxide layer due to the dissolution of CuAl2. Similarly, alloys with high silicon content result in a dark gray oxide film. Alloys containing over 5% beryllium copper or more than 7.5% silicon are not suitable for chromic acid anodizing. Additionally, aluminum alloys with high levels of copper or silicon cannot be hard anodized using traditional methods and must instead use a high-frequency power supply designed for hard anodizing.
When it comes to decorative anodizing, the choice of aluminum and its alloys becomes even more critical. Generally, only pure aluminum, aluminum-magnesium alloys, or aluminum-manganese alloys can achieve vibrant and vivid colors after dyeing. On the other hand, alloys with higher silicon or iron content tend to produce darker oxide films, which are better suited for dark color dyes. When selecting materials for decorative anodized parts, several factors should be considered:
For parts requiring a mirror-like surface finish, it is essential to choose high-purity aluminum or 5A66 aluminum-magnesium alloys with an aluminum content exceeding 99.99%. After chemical or electrochemical polishing, anodizing with sulfuric acid results in a clear, transparent, and bright oxide layer that can be easily dyed with bright and attractive colors.
If a lower surface brightness is acceptable, industrial-grade high-purity aluminum (with an aluminum content above 99.9%) or specific aluminum-magnesium alloys like LT65 and LT67 are good options.
For general decorative applications, there is more flexibility regarding the presence of impurities and other elements in the aluminum material. However, aluminum-magnesium alloys are typically preferred for their balance of performance and aesthetics.
When choosing aluminum materials, it's also important to consider the surface condition. The selected aluminum should not have serious scratches, structural defects, or inclusions, as these can negatively affect both the appearance and corrosion resistance of the oxide film. Additionally, some aluminum alloys require proper heat treatment. Grain size plays a key role in the structure and properties of the oxide layer—coarse grains can lead to non-uniform reactions during anodizing, resulting in an "orange peel" effect. Therefore, fine-grained aluminum materials are generally preferred.
When operating oxidation equipment, special attention should be given to the type of power supply used. For hard anodizing, it is recommended to use a high-frequency, water-cooled power source with a square wave output. This type of power supply provides faster and more efficient film formation while also being energy-efficient, making it a superior choice for industrial applications.
Plasma Consumables Compatible for SG
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Plasma Consumables Compatible for SG, SG-51 Plasma Cutting, SG123 Plasma Cutting
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