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Electro-galvanized expansion hook
Made of Q235 carbon steel and other materials, the surface is electro-galvanized, and the coating thickness is usually 5-12μm, which meets the post-treatment requirements of c1B (blue-white zinc) or c1A (bright zinc) in GB/T 13911-92 standard.
Description
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Product Introduction
Material: Made of Q235 carbon steel and other materials, the surface is electro-galvanized, and the coating thickness is usually 5-12μm, which meets the post-treatment requirements of c1B (blue-white zinc) or c1A (bright zinc) in GB/T 13911-92 standard.
Performance: It has good corrosion resistance and is suitable for indoor dry environment or slightly humid environment. It can withstand a certain tensile force (such as the maximum static force of M10 in concrete is about 320 kg).
Application: It is often used to fix lamps, pipe hanging cards, guardrails, etc. in building decoration. When installing electric water heaters and solar water heater hooks, the equipment can be firmly fixed on the wall or ceiling through the expansion hook.
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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