Identification of Poor Quality Aluminum Profiles

Alufolien-or-EN

Titanium gold plating process for aluminum profiles belongs to coating technology, which is based on the conventional titanium plating process with the addition of pre-plating and electroplating process steps, and the aluminum profile process is to place the activated plated parts in an aqueous solution of salt and hydrochloric acid for chemical treatment; the plating solution composition of the plating process includes nickel sulfate, nickel chloride, boric acid, sodium dodecyl sulfate, saccharin, and brightener, etc. This process has the advantages of simple, practical and good effect. The film hardness of titanium aluminum profile made by this process is HV≈1500, 150 times more wear-resistant than 22K gold plating under the same conditions, and can be processed into various forms of gold, color, black and other bright series of aluminum profile products.

Aluminum is divided into raw aluminum and cooked aluminum, raw aluminum is below 98% of aluminum, the nature of brittle and hard, can only turn sand casting goods; cooked aluminum is above 98% of aluminum, the nature of soft, can be calendered or rolled a variety of utensils. Inferior quality aluminum profiles greatly reduce the closure time and chemical reagent loss, although the cost is reduced, but the corrosion resistance of the profile is also greatly reduced. So when ordering aluminum profiles, how to identify whether they are of inferior quality?

Extrusion defects. The extrusion process of aluminum profiles will produce defects such as bubbles, inclusions, layer formation, color difference, distortion and so on, which will affect the quality of aluminum profiles due to the completeness of the extrusion equipment, the maturity of the extrusion process and the improper operation.
The influence of production process on the quality of aluminum profiles is very far-reaching, which is mainly reflected in the production equipment, moulds, operation conditions and aging; to identify whether the extrusion of profiles meets the requirements, we can start from the appearance, precision and strength, and use professional equipment to observe whether the surface of profiles is flat, whether there is orange peel or cracks, whether the straightness of profiles is qualified, etc.; regarding the strength of profiles, we need to test them with the help of professional equipment. The strength and toughness of a single profile.

The thickness of oxide film is thin. The Chinese national standard stipulates that the thickness of the oxide film of architectural aluminum profiles should be not less than 10um (micron). The thickness is not enough, the surface of aluminum profile is easy to rust and corrode. Some of the aluminum profiles without production name, factory address, production license and certificate of conformity in the random inspection, the thickness of the oxide film is only 2 to 4um, and some even have no oxide film. According to expert estimates, every 1um oxide film thickness reduction, each ton of profiles can reduce the cost of electricity consumption by more than 150 yuan.

The material of 6063 series aluminum profiles is mainly aluminum-magnesium alloy, but in order to enhance the physical strength of the profiles, other metal elements are added to the alloy to form the best ratio of metal elements, which we call the standard ratio; the raw materials melted and cast according to the standard ratio are called primary aluminum rods, and the extruded profiles have high strength and stable performance; however, in order to reduce the cost, many enterprises use secondary or repeatedly recycled aluminum materials. However, in order to reduce the cost, many enterprises use secondary or repeatedly recycled aluminum materials to extrude the molten aluminum rods, and the alloy composition ratio of the produced profiles is not uniform, and many deposited impurities are mixed, so the quality of the profiles is not guaranteed.

Chemical composition is not qualified. Aluminum profiles mixed with a large amount of miscellaneous aluminum, aluminum scrap can greatly reduce the cost, but it will lead to unqualified chemical composition of aluminum profiles for construction, which will seriously endanger the safety of construction projects. Unqualified aluminum profiles, the use of air, rain, sunlight and other influences, resulting in deformation of aluminum profiles, and even the formation of glass cracking, falling off and other appearances.

From the material aspect, the surface color of the extruded aluminum profile with the original quality aluminum bar is white, and the surface of the extruded profile with inferior quality aluminum bar is dark, so that the raw material can be judged as good or bad.
In terms of appearance, the surface of ordinary aluminum profiles is only silver-white oxidized, and the stretch lines formed on the surface of the profiles during the extrusion process are very obvious; while the standard profiles need to be sandblasted before oxidation to remove the stretch lines on the surface of the profiles and increase the surface density of the profiles, which can enhance the corrosion resistance of the surface of the profiles, and the effect is beautiful.

Many people usually take the price as a reference when purchasing aluminum profiles, such a procurement method is too one-sided, because many profiles have the same specifications, but the product material, process and weight are very different, if we only focus on the price, then it is easy to be misled, so when choosing products we need to consider the material, process and appearance, etc. For more information, contact Yutwin customer service for more information, we are happy to answer your questions about aluminum.


Post time: Oct-19-2022