How to effectively prevent oxidation or discoloration of the metal frame of a 120 metal frame switch during long-term use?
Publish Time: 2026-01-29
The 120 metal frame switch, with its robust and durable structure and modern smart features, is gradually becoming the preferred choice for high-end home electrical control. Effectively preventing oxidation or discoloration of the metal frame is crucial, as it not only affects the product's aesthetics but also directly impacts its lifespan and safety performance.1. Using a highly corrosion-resistant metal substrate is fundamental to oxidation prevention.Metal frames are typically made of materials such as aluminum alloy, stainless steel, or zinc alloy. Among these, 6063-T5 aluminum alloy is widely used due to its excellent mechanical strength, machinability, and natural oxide film; 304 stainless steel possesses extremely strong corrosion resistance but is more expensive; while zinc alloy die-cast parts offer flexible shapes, they require high-quality surface treatment to resist corrosion. To ensure long-term oxidation prevention, aluminum alloys with optimized proportions of elements such as copper and magnesium should be prioritized, and batches with excessively high impurity content should be eliminated through rigorous material testing, thus improving corrosion resistance from the source.2. Advanced Surface Treatment Processes Create a Long-Lasting Protective LayerEven if high-quality metals possess inherent oxidation resistance, surface treatment is still necessary to form a stable protective layer. Common processes include anodizing, electrophoretic coating, nano-coating, and PVD coating. Anodizing generates a dense Al₂O₃ film on the aluminum surface, with a thickness of 10–25 μm, significantly improving wear resistance and corrosion resistance. Electrophoretic coating covers the metal surface with a uniform organic paint film, providing both insulation and decorative effects. PVD coating not only ensures long-lasting color but also blocks moisture and oxygen penetration at the microscopic level, effectively preventing discoloration. For products emphasizing a "pure white appearance," a composite process of white electrophoresis and transparent anodizing is often used, balancing aesthetics and durability.3. Sealed Structural Design Prevents Moisture and Contaminant IntrusionThe seams between the metal frame and the internal plastic base and button components are key pathways for moisture and dust intrusion. High-quality triple switches incorporate silicone sealing rings or ultrasonic welding technology between the frame and the base, achieving IP20 or even IP44 protection levels. Furthermore, the moving parts of the buttons are often designed with a labyrinthine structure or micro-gap fit to ensure smooth operation while limiting the entry of external contaminants into the metal interior. This "dual protection" strategy can significantly delay the appearance of spots or rust on the metal edges caused by localized corrosion.4. Adapting to Diverse Usage Environments and Enhancing Environmental AdaptabilityAlthough 120 metal frame switches are mostly used in dry indoor areas, they still face challenges in kitchens, balconies, or high-humidity areas in the south. Therefore, product design must consider environmental adaptability—for example, in coastal areas with high salt spray, ordinary aluminum alloys should be avoided, and marine-grade stainless steel or surface treatments that have undergone special salt spray testing should be used instead. At the same time, the integration of the smart module should not compromise the integrity of the metal casing; non-conductive isolation areas or embedded antenna windows are needed to ensure signal transmission while maintaining protective integrity.5. Proper Use and Regular Maintenance Extend the Lifespan of the AppearanceEven with multiple layers of protection, users' daily usage habits affect the long-term condition of the metal frame. It is recommended to avoid using cleaners containing chlorine, acids, or abrasive ingredients to wipe the switch surface. When cleaning, gently wipe with a slightly damp, soft cloth, then dry immediately. If minor oxidation marks are found, they can be repaired with a specialized metal care product; do not forcibly scratch them. In addition, regularly checking for loose mounting screws to prevent seal failure due to vibration is also an important step in preventing oxidation.In summary, the oxidation or discoloration of the 120 metal frame switch is a complex engineering project encompassing materials science, surface engineering, structural design, and user behavior. Through the synergistic effect of high-quality substrates, advanced coatings, tight sealing, and proper maintenance, not only can its "pure and elegant" white appearance be maintained, but advanced functions such as three-way independent control, intelligent linkage, and scene timing can also be ensured to operate long-term on a safe and reliable physical carrier, truly achieving a unity of aesthetics and practicality.
