Door hinges are key components that connect doors and door frames. Their rust prevention and surface treatment are crucial, which not only affects the aesthetics, but also has a direct impact on the service life and performance stability.
The rust prevention performance of door hinges depends first on the material basis. Stainless steel, aluminum alloy and galvanized steel are the mainstream choices. Among them, stainless steel has become the first choice for high-end products due to its strong corrosion resistance. Aluminum alloy forms a dense oxide film through anodizing, and galvanized steel isolates oxygen and moisture through the electroplated zinc layer. For example, after anodizing, the surface hardness of aluminum alloy hinges can be increased by 30%, and the corrosion resistance is significantly enhanced.
Electroplating is a traditional and efficient surface treatment method. Metal layers such as zinc, nickel, and chromium are deposited on the metal surface through electrolysis to form a physical barrier. For example, when the thickness of the nickel plating layer reaches 10-25 microns, the neutral salt spray test can last up to 96 hours without rusting, effectively resisting erosion in a humid environment.
The spraying process uses high-pressure airflow to evenly cover the anti-corrosion paint on the hinge surface, which not only enhances corrosion resistance, but also allows customization of multiple colors. The application of environmentally friendly water-based paint reduces VOC emissions by 60%, while maintaining the paint film adhesion ≥5MPa, meeting the indoor environment use standards.
For aluminum alloy hinges, anodizing technology can generate a 5-25 micron thick aluminum oxide film layer on the surface. This process increases the material hardness to HV200-300 and the wear resistance by 4 times, which is particularly suitable for high-humidity environments such as kitchens and bathrooms.
Mechanical polishing removes surface burrs through tools such as sandpaper and polishing wheels, giving the hinge a mirror or brushed effect. The surface roughness Ra≤0.025μm after mirror polishing not only improves the aesthetics, but also reduces dirt adhesion and reduces the difficulty of cleaning.
Regularly wipe the hinge surface with a neutral detergent and avoid using acidic or alkaline detergents. Applying special grease every 3-6 months can reduce the friction coefficient by 30% and extend the service life. For rusted hinges, you can apply anti-rust oil after sandpaper polishing, or use stainless steel passivation treatment to form a protective film.
For steel hinges, the galvanizing + passivation composite process can significantly improve corrosion resistance. When the galvanizing layer thickness reaches 8-12 microns, combined with passivation treatment, the neutral salt spray test can be rust-free for 240 hours, which is particularly suitable for high-corrosion environments such as coastal areas.
The rust prevention and surface treatment of door hinges need to be comprehensively considered based on the use environment, cost budget and aesthetic requirements. Through scientific material selection, advanced technology and regular maintenance, the hinges can be ensured to operate stably for a long time, providing reliable protection for home life.
