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Colored zinc-plated expansion bolts
The color zinc passivation process (c2C) is adopted, the coating thickness is 8-15μm, and the corrosion resistance of the salt spray test is more than 72 hours, which has both anti-corrosion and decorative functions.
Description
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Product Introduction
Surface treatment: The color zinc passivation process (c2C) is adopted, the coating thickness is 8-15μm, and the corrosion resistance of the salt spray test is more than 72 hours, which has both anti-corrosion and decorative functions.
Performance: Compared with electroplated zinc expansion bolts, color zinc-plated products have stronger corrosion resistance in humid, industrial pollution and other environments, and more beautiful appearance, suitable for outdoor or projects with high appearance requirements.
Application: Commonly used in harsh environments such as bridges, tunnels, and marine engineering, as well as exposed fixings in building decoration, such as protective windows and awnings.
Surface treatment comparison and selection suggestions
| Treatment process | Color | Thickness range | Salt spray test | Corrosion resistance | Wear resistance | Main application scenarios |
| Electrogalvanizing | Silvery white / blue-white | 5-12μm | 24-48 hours | General | Medium | Indoor dry environment, ordinary mechanical connection |
| Colored zinc plating | Rainbow color | 8-15μm | More than 72 hours | Good | Medium | Outdoor, humid or mildly corrosive environment |
| Black zinc plating | Black | 10-15μm | More than 96 hours | Excellent | Good | High temperature, high humidity or decorative scenes |
Selection suggestions:
Environmental factors: Colored zinc plating or black zinc plating is preferred in humid or industrial environments; electrogalvanizing can be selected in dry indoor environments.
Load requirements: For high-load scenarios, it is necessary to select expansion bolts of appropriate grades (such as 8.8 or above) according to the specification table, and pay attention to the impact of the galvanizing process on mechanical properties (such as hot-dip galvanizing may cause a decrease in tensile strength of about 5-10%).
Environmental requirements: Colored zinc plating and black zinc plating may contain hexavalent chromium and must comply with environmental directives such as RoHS; cold galvanizing (electrogalvanizing) has better environmental performance and does not contain heavy metals.
Appearance requirements: Colored zinc plating or black zinc plating is preferred for decorative scenes, and electrogalvanizing can be selected for general industrial use.
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