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Black zinc plated pin shaft
Through the black passivation liquid treatment (c2D) containing silver salt or copper salt, a black passivation film is formed with a thickness of about 10-15μm. The cost is high but the appearance is unique.
Description
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Product Introduction
Process: Through the black passivation liquid treatment (c2D) containing silver salt or copper salt, a black passivation film is formed with a thickness of about 10-15μm. The cost is high but the appearance is unique.
Performance: The corrosion resistance is better than colored zinc, especially in high temperature or high humidity environment. It is stable and has a certain wear resistance. It is suitable for special scenes such as decoration and solar heat absorption.
Application: Precision connection of automotive parts (such as wiper pins), high-end mechanical equipment, and occasions where extinction or anti-electromagnetic interference is required.
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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