The quality difference exists in all products, and the reasons for the formation of different products are different. The quality factors affecting the T slot aluminum profiles can be analyzed from the aspects of material, dimensional tolerance and surface treatment, and the defects in any aspect may have different degrees of impact on the mechanical properties and external properties of T slot aluminum profiles.


 

Texture of material:

T slot aluminum profile is a new type of aluminum alloy material, which is made of aluminum as the main raw material, and then added with other alloy elements. 6063-T5 is the most widely used  T slot aluminum profile, with aluminum content of 97.35-98.35%, and other alloy elements content of 0.49-0.9% magnesium, 0.2-0.6% silicon The content of 0.35% for iron, 0.1% for copper, chromium, zinc and titanium respectively. The tensile strength, yield strength and hardness of the T slot aluminum profiles produced by this formula can reach 180MPa, 127mpa and 62hb respectively. Therefore, the formula of alloy elements is particularly important in the production of T slot aluminum profiles.

The function of each alloy element: the density of aluminum element is small (2.7g / cm3), and the weight is light, which is well known; magnesium element can increase its strength and hardness; silicon element can improve its strength and hardness, and reduce its elongation; copper element can improve its cutting performance; iron element can refine the grain; nickel can improve the high temperature and heat resistance of aluminum alloy; chromium can reduce the cracking degree and improve the aluminum alloy The toughness of T slot aluminum profile; zinc can strengthen; titanium can improve the mechanical properties of T slot aluminum profile; manganese can improve the corrosion resistance of T slot aluminum profile. Each alloy element will have a certain impact on the mechanical properties of T slot aluminum profiles. The content of various alloy elements should be controlled within the specified range. Therefore, in order to reduce the production cost, some T slot aluminum profile manufacturers cut corners on the alloy formula, which is one of the reasons why some T slot aluminum profiles are cheap. The production cost is reduced, but the bearing capacity and Other mechanical properties must be affected.

Aluminum profile shelf


 

Dimensional tolerance:

Dimension tolerance refers to the difference between the maximum allowable dimension and the minimum allowable dimension. It is a value that the allowable dimension can float up and down. It is normal within the range of this absolute value. Beyond this range, it will affect the service performance of the T slot aluminum profile, thus affecting the quality of the T slot aluminum profile. The dimensional tolerance of 6063-T5 series  T slot aluminum profiles mainly includes section width, transverse tolerance, longitudinal straight tolerance and angular tolerance. Understanding the scope of dimensional tolerance is conducive to the calculation of the deformation amount of T slot aluminum profiles when customers select models. Through the calculation formula of the deformation amount, suitable T slot aluminum profile models can be selected, and the dimensional tolerance of T slot aluminum profiles can not meet the national standards Deviation will affect the performance of T slot aluminum profiles.

Surface treatment:

The oxide film on the surface of the extruded T slot aluminum profile is soft and thin, only 0.5-4 μ m, which is very corrosion-resistant. It must be treated by surface treatment and hole sealing to thicken the oxide film, and form other colors, so as to enhance the corrosion resistance and decoration effect of the T slot T slot aluminum profile. In order to reduce the cost, some businesses have done some work on the surface treatment. The thickness of the oxide film is only 2-4 μ m, which can not reach the national standard of more than 10 μ M. some even have no oxide film. The T slot aluminum profiles produced are low in price, low in corrosion resistance, and can not reach the use effect at all.

There are many kinds of surface treatment methods, such as anodizing, sandblasting, electrophoretic coating and electrostatic powder spraying. Each surface treatment method has different functions, such as sandblasting oxidation to reduce the surface roughness of T slot aluminum profiles and improve the surface adhesion; anodizing to increase the corrosion resistance of T slot aluminum profiles; electrophoretic coating and electrostatic powder spraying can make Various colors are obtained on the surface of T slot aluminum profiles, which increases the thickness of oxide film, improves the corrosion resistance, wear resistance and weather resistance of the surface, enhances the service life and improves the appearance performance.

Before the surface oxidation treatment, the surface pretreatment shall be carried out to remove the oxide film and oil stain on the surface of the T slot aluminum profile, so that the aluminum matrix can be fully exposed, so as to facilitate the formation of new oxide film. Each surface treatment method has corresponding precautions. For example, if the powder distribution is uneven during the electrostatic powder spraying, the coating will produce color difference; the water washing is not thorough during the pretreatment, It will cause poor adhesion of the coating and affect the spraying effect; if there are pinholes or sundries on the coating surface, it will cause orange peel defects on the surface of the produced T slot aluminum profile, thus affecting the appearance and use effect; there are also spraying powder affected by moisture, improper distance of the spray gun and too high curing temperature, which will affect the spraying quality, so the correct surface treatment method can avoid Free of various defects such as color difference, orange peel, bubble and groove on the surface of T slot T slot aluminum profile, which can ensure the higher quality of T slot T slot aluminum profile products, and improve the use performance and appearance performance.