The durability of titanium alloy coat racks is closely related to their surface treatment processes. Different processes alter the physicochemical properties of the material's surface, directly affecting its corrosion resistance, wear resistance, and fatigue resistance, thus determining the product's lifespan and user experience. While titanium alloys possess high strength, low density, and excellent corrosion resistance, untreated surfaces can still experience performance degradation due to oxidation, wear, or stress concentration in humid, salt spray, or high-frequency contact environments. Therefore, surface treatment processes are crucial for enhancing durability.
Anodizing is one of the commonly used surface treatment processes for titanium alloy coat racks. This process forms a dense oxide film on the titanium alloy surface through electrolysis, significantly improving the material's corrosion resistance and allowing for diverse colors by controlling the oxide film thickness. For example, in fluorinated electrolytes, the oxide film can exhibit interference colors such as yellow, green, and gold, satisfying decorative needs while also preventing the penetration of corrosive media through the oxide film's barrier effect. Furthermore, the hardness of the anodic oxide film is higher than that of the substrate, effectively resisting scratches and wear during daily use and extending the coat rack's appearance.
Micro-arc oxidation technology further enhances the protective performance of titanium alloy surfaces. This process utilizes high-voltage electric sparks to generate a ceramicized oxide film in situ on the surface of titanium alloys. The film thickness can reach hundreds of micrometers, and its hardness approaches that of ceramic materials. This ceramic film exhibits extremely high bonding strength with the substrate, and will not detach even under the high pressure of a hydraulic press. It also possesses excellent wear resistance, corrosion resistance, and thermal shock resistance. For coat racks that are exposed to humid environments for extended periods or frequently come into contact with clothing, the micro-arc oxidation process can significantly reduce surface wear rates, prevent coating peeling due to friction, and thus extend product lifespan.
Physical vapor deposition (PVD) technology provides titanium alloy coat racks with high-hardness, high-wear-resistance ceramic or composite coatings. By evaporating and depositing coating materials onto the substrate surface in a vacuum environment, the PVD process can form a thin film with strong adhesion and uniform thickness. The coatings come in a variety of colors, including silver, black, and gold, to meet personalized decorative needs. More importantly, PVD coatings, such as CrN and TiAlN multi-component nitrides, exhibit excellent chemical stability in high-temperature oxidation environments, effectively preventing the diffusion of corrosive media into the substrate while simultaneously increasing surface hardness and reducing damage caused by impacts from hard objects.
Chemical treatment processes involve the reaction of the titanium alloy surface with chemical reagents to form a protective oxide film or other functional coating. For example, high-concentration NaOH or H₂O₂ treatment can generate a stable oxide protective layer on the material surface, blocking corrosive media. Acid-alkali pretreatment combined with rapid calcification solution immersion can construct a bioceramic coating on the titanium alloy surface, improving corrosion resistance and biocompatibility. These processes are relatively low-cost, but require strict control of treatment parameters to avoid an excessively thin or unevenly distributed film, which could affect the overall protective effect.
Sandblasting uses a high-speed stream of sand to impact the titanium alloy surface, removing the oxide layer and increasing surface roughness, thereby improving coating adhesion and fatigue resistance. Sandblasted coat racks exhibit significantly improved bonding strength between the surface and subsequent coatings or oxide films, effectively preventing coating peeling and extending the service life of the protective layer. Simultaneously, sandblasting improves surface smoothness and aesthetics, eliminates machining marks, and enhances product quality.
Different surface treatment processes enhance the corrosion resistance, wear resistance, and fatigue resistance of titanium alloy coat racks, collectively improving their durability. Anodizing and micro-arc oxidation processes focus on forming a dense protective layer, suitable for humid or corrosive environments; PVD technology improves wear resistance through high-hardness coatings, suitable for high-frequency contact scenarios; chemical treatment and sandblasting processes optimize surface condition, providing a good foundation for subsequent coatings. In practice, the choice should be based on a comprehensive consideration of the coat rack's usage environment, decorative requirements, and cost budget to achieve a balance between durability and economy.
