How to distinguish good or defective aluminum profiles?

Ten steps to teach you how to judge the quality of #aluminumprofile :

1. Check the label

Check whether it marked the aluminum alloy profile and packaging with a product certificate and production license number, etc.

2. Check the surface quality

The surface of the aluminum alloy #profile should be clean and free from defects such as cracks, peeling, corrosion, and bubbles. There should be no defects such as corrosion spots, burns (oxidation electrode points), black spots, or oxide film peeling. Also, check the color and glossiness of the aluminum profile surface and whether there is any color difference. The darker the color, the more impurities it contains.

3. Check the thickness of the oxide film

The oxide film of #anodized aluminum profiles is formed by passing an electric current through the #aluminumprofile ends in an acid-base solution, which has a protective and decorative effect and can be detected using an eddy current thickness gauge. Generally, the thickness of the oxide film is between 8-15μ, the thicker the oxide film, the more corrosion-resistant it is, and the higher the oxidation cost.

4. Check the ceiling

Use the acid immersion method to clean the surface of the aluminum profile with acetone, drip 50% nitric acid on the surface, gently wipe it, and rinse with water after 1 minute. Then, drip a drop of purple medicine on the surface of the aluminum profile, wipe off the purple medicine, and clean it after 1 minute. Aluminum profiles with poor sealing will leave obvious marks. The heavier the marks, the poorer the quality.

5. Check the color

The color of the same aluminum alloy profile should be #consistent . If there is a significant color difference, it is not suitable for purchase. Generally, the normal color of the aluminum alloy profile cross-section is silver-white, and the texture is uniform. If the color is dark, it can be determined to be recycled aluminum or waste #aluminum recycled and forged.

6. Check the flatness

The flatness is the plane gap. For industrial aluminum profiles, the smaller the gap value, the better, which is the requirement for its section size. From an overall perspective, the standard specifies the bending and torsion, which should not exceed the allowable range.?

7. Check the strength

When purchasing, you can use your hand to bend the profile moderately. If the profile can be easily #bent, it can be determined that the strength of the aluminum profile does not meet the standard. In addition, the stronger the profile, not the harder, the better. Aluminum has a certain toughness but is not a hard material. Utilizing this characteristic is good for forging into different shapes. Therefore, when purchasing, the owner should recognize the brand and observe it carefully.

8. Check the corrosion resistance

Drop about 10mg of 100g/L NaOH solution at 35℃±1℃ onto the surface of the aluminum profile with an alkaline drip. Observe the corrosion bubbles in the droplet until the penetration time of the oxide film is calculated. This test is easy to perform outdoors in the summer and can roughly judge the performance.

9. Check the glossiness

Aluminum alloys should avoid purchasing profiles with open bubbles and ash residues on the surface, as well as obvious defects such as cracks, burrs, and peeling. If there are any of the above phenomena, it can be determined that they are recycled aluminum or waste #aluminum processed into a secondary shape. Due to the uneven texture and mixed alloy ratio, it is prone to cracking and oxidation in the later stages.

10. Check the thickness

The wall thickness of commonly used 70 and 90-series aluminum #windowprofiles should be 1.2-2.0mm. The national standard for the wall thickness of balcony window aluminum profiles is different.

?About how to distinguish good and bad aluminum profiles, if you have a better way, welcome to communicate with us Shijun Hongmao Aluminum.