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Five steps to identify the quality of aluminum profiles

  • Categories:Trade News
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  • Time of issue:2018-05-22 10:41
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(Summary description)When we buy aluminum alloy profiles, we will find that the price is uneven. We often don't know how to look at its quality. The appearance of the price difference of several hundred thousand yuan a ton looks almost the same. In fact, there is still a difference. The following five methods for identifying aluminum alloy profiles are expected to be useful to buyers

Five steps to identify the quality of aluminum profiles

(Summary description)When we buy aluminum alloy profiles, we will find that the price is uneven. We often don't know how to look at its quality. The appearance of the price difference of several hundred thousand yuan a ton looks almost the same. In fact, there is still a difference. The following five methods for identifying aluminum alloy profiles are expected to be useful to buyers

  • Categories:Trade News
  • Author:
  • Origin:
  • Time of issue:2018-05-22 10:41
  • Views:
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When we buy aluminum alloy profiles, we will find that the price is uneven. We often don't know how to look at its quality. The appearance of the price difference of several hundred thousand yuan a ton looks almost the same. In fact, there is still a difference. The following five methods for identifying aluminum alloy profiles are expected to be useful to buyers.

1. Surface quality: In addition to the cleaning of the surface of the aluminum alloy profile, cracks, peeling, corrosion and bubbles are not allowed. No corrosion spots, electric burns (oxidation electrode spots), black spots or oxide film peeling are allowed. And other defects. Also look at the color and gloss of the surface of the aluminum profile, whether there is color difference. The darker the color, the more impurities are contained. 3. Sealing quality: There are many voids left on the surface of the aluminum profile after anodizing. If it is not closed or closed, the corrosion resistance of the aluminum profile will be reduced. The commonly used methods for sealing quality inspection are acid leaching and guiding. Naf and Phosphorus Butyric Acid Method. Acid leaching method is generally used in the on-site inspection. The surface of the aluminum profile is wiped clean with acetone to remove oil and dust. The nitric acid with a volume ratio of 50% is dripped onto the surface and gently scrubbed. After 1 minute, it is used. Wash off the nitric acid in water, then dry it. Drip a drop of medical purple medicine onto the surface. After 1 minute, wipe off the purple syrup and thoroughly clean the surface, and carefully observe the traces left. The aluminum profile with poor sealing will leave obvious marks. The heavier the trace, the worse the quality of the seal.

2. Sealing quality: There are many voids left on the surface of the aluminum profile after anodizing. If it is not closed or closed, the corrosion resistance of the aluminum profile will be reduced. The commonly used methods for sealing quality inspection are acid leaching and guiding. Naf and Phosphorus Butyric Acid Method. Acid leaching method is generally used in the on-site inspection. The surface of the aluminum profile is wiped clean with acetone to remove oil and dust. The nitric acid with a volume ratio of 50% is dripped onto the surface and gently scrubbed. After 1 minute, it is used. Wash off the nitric acid in water, then dry it. Drip a drop of medical purple medicine onto the surface. After 1 minute, wipe off the purple syrup and thoroughly clean the surface, and carefully observe the traces left. The aluminum profile with poor sealing will leave obvious marks. The heavier the trace, the worse the quality of the seal.

3. Oxide film thickness: The oxide film of the anodized aluminum profile is formed by energizing both ends of the aluminum profile in an acid-base solution, which has protective and decorative effects and can be detected by an eddy current thickness gauge. Generally, the thickness of the oxide film is between 8 and 15 μ. The thicker the oxide film, the more corrosion resistant and the higher the oxidation cost.

4. Corrosion resistance: This index mainly affects the life of aluminum profiles. Corrosion resistance inspection has copper accelerated acetate spray test and drop alkali test. Here, the drop alkali test is introduced. That is, at 35 °C ± 1 °C, it will be about 10mg, 100g / L NaOH solution was dropped onto the surface of the aluminum profile, and the droplets were visually observed until corrosive bubbling occurred, and the time of penetration of the oxide film was calculated. This test is easy to judge in the outdoor step in summer, to ensure the test. The accuracy must be carried out under the strict conditions of the laboratory.

5. Hardness: The hardness of the general grade 6063 aluminum profile is between 8 and 12HW, measured by a Vickers hardness tester.

 

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