Laser marking on aluminum parts after oxidation does not fade
After aluminum parts undergo oxidation treatment, laser marking on them results in markings with excellent durability that do not fade easily. The following are the specific reasons:
1. The role of the oxide layer
After aluminum parts undergo oxidation treatment, a dense oxide film forms on their surface. This oxide film not only enhances the surface hardness and corrosion resistance of the material but also provides protective effects during the laser marking process. During laser marking, the laser beam acts on the oxide layer, causing physical or chemical changes in certain areas, thereby forming the mark. Due to the presence of the oxide layer, the surface of the marked aluminum part can resist external environmental corrosion, maintaining the durability of the mark.
2. Advantages of Laser Marking Technology
Laser marking is a non-contact processing method that uses a high-energy-density laser beam to locally treat the material surface, achieving the marking effect. When laser marking is performed on the oxide layer of aluminum parts, the laser beam's energy precisely acts on the oxide film, causing color changes or partial removal, thereby forming clear markings. This processing method does not damage the base material of the aluminum part, and the marking effect is permanent, not fading due to factors such as touch, high/low temperatures, or acidic/alkaline environments.
III. Experimental Data Support
Experiments compared the marking effects on anodized aluminum surfaces using a specific laser marking method and a traditional laser marking method. The results showed that the marked areas on the anodized aluminum surface treated with the specific laser marking method were smooth and had no tactile sensation, while the marked areas treated with the traditional method were rough and had a noticeable tactile sensation. Further metallographic microscope observations revealed that the anodized aluminum surfaces marked using the specific method exhibited micro-crack morphology, smooth and flat; whereas the surfaces marked using the traditional method were uneven, rough, and protruding. Additionally, measurements of the oxide film thickness showed that the oxide film thickness decreased slightly after marking using the specific method, while it decreased significantly after marking using the traditional method. Salt spray test results also indicate that the anodized aluminum marked using the specific method shows almost no difference in appearance after the salt spray test, with minimal damage to the oxide film; however, the anodized aluminum marked using the traditional method exhibits localized discoloration and pitting corrosion, indicating that the oxide film has lost a certain degree of protective function.
IV. Stability in Practical Applications
In practical applications, laser marking technology has been widely adopted for marking aluminum components. For example, in fields such as consumer electronics and aerospace components, laser marking can achieve high-contrast, durable, and aesthetically pleasing markings. These application areas demand extremely high durability and stability from markings, and laser marking technology meets these requirements, demonstrating its stability and reliability for marking on aluminum oxide layers.
In summary, laser marking on aluminum parts after oxidation does not fade. The presence of the oxide layer provides protection for the markings, and the non-contact processing method and precise energy control of laser marking technology ensure the durability of the markings. Experimental data and practical applications further validate this. Therefore, laser marking on the oxide layer of aluminum parts is a reliable and durable marking method.
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