1. We often see 5083H112 aluminum plate, AA6061, AA7075, AA2024 and AA5052 in engineering materials or drawings. What does AA stand for?

A: AA is the abbreviation of aluminum association, which is the abbreviation of American aluminum association. AA is only in front of deformed aluminum alloy jin brand. It means that the brand is produced and tested according to Alcoa standards.

2. Our products have a bending process in the manufacturing process, and it is required that there are no cracks or fine lines at the bending part of aluminum parts.

Answer: all the plates have passed the semi-conductive bending test, and there will be no cracking when bending 180 degrees.

3. The aluminum plate we need is a bedplate used in precision machinery, which requires beautiful coloring effect. Can Alcoa meet this requirement?

Answer: the coloring effect of aluminum plate is determined by three factors: lattice structure arrangement, microstructure compactness and heat treatment technology. Alcoa products have exquisite production technology, accurate chemical composition control and complete inspection procedures, which ensure the consistent excellent quality of Alcoa.

4. Our aluminum workpieces need to work continuously or intermittently at 300-500℃. Can Alcoa meet the requirements?

Answer: the heat treatment technology is excellent, and the product is below 300mm thickness (or diameter), and the strength and hardness can be consistent; Yong long-term deformation will not occur in the working environment of 400℃.

5. Ultra-hard aluminum must be harder than hard aluminum, right?

A: Not exactly. Some technical performance indexes of aluminum alloy (such as strength, hardness, etc.) can only be compared under the same standard, brand and treatment state. 5083H112 aluminum plate is a fine product of 5xx series, and other expressions mean the hardness (HB150) of Alcoa AA7075-T651, but the hardness (HB60) of AA7075-0 is much lower than that of AA6061-T651. It is often seen that some brands are dislocated in the market (for example, the hardness of domestic brand LY12 is lower than 6061-T6).

6. Why are the colors of different types of aluminum materials different after anodic oxidation?

A: The alloy composition and content of different models of aluminum are also different. The purity of aluminum directly affects the transparency of the oxide film, and the elements Si, Mn, Cr and Mg in the alloy will affect the color of the oxide film, thus affecting the color of the oxide film.

7. Why can't anodized aluminum alloy parts be used in alkaline environment?

A: The composition of the oxide film formed by anodic oxidation of aluminum alloy is alumina. The film is compact and wear-resistant. Alumina is an amphoteric substance, which will react with alkali to dissolve the film.

8. Whether it is domestic aluminum alloy or European aluminum alloy, as long as the brand can correspond to Alcoa, the quality is roughly the same, right?

A: The quality of aluminum alloy products is closely related to the following factors besides production technology, industrial equipment level and the quality of workers:

A, the quality of products under different production standards and specifications is different because of their different requirements.

B, some technical treatment and inspection items of aluminum alloy products, if not required by the buyer, will not be provided by the supplier, which may cause significant differences in product performance. For example, the series of heat-treatable strengthened alloys in Alcoa products have been treated by internal stress relief technology, and through ultrasonic flaw detection, spectral analysis, semi-conductor bending test, micro-corrosion test, electromagnetic (eddy current) test and cracking sensitivity test, Alcoa products are guaranteed to be outstanding in all aspects of the market.

C/ The numbers in wrought aluminum or aluminum alloy jin only represent its purity or the large average percentage of Z of some alloy chemical elements.

D, even the chemical composition content, the products of the same brand are different because of the different production standards and different production batches.

9. Is there obvious crystal spot on aluminum after anodic oxidation?

A: The crystal spot is caused by segregation and segregation of alloy elements in aluminum alloy under improper extrusion process and irregular heat treatment, which leads to intergranular corrosion, white flocculent AL (OH) 3 finally precipitates in Z, and forms crystal spot after drying.

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