Fastener electro-galvanizing is a widely used surface treatment technology to improve the corrosion resistance and aesthetics of fasteners (e.g. screws, nuts, bolts, etc.). Here are some key points about zinc electroplating of fasteners:
Author: Anna
Fastener electro-galvanizing is a widely used surface treatment technology to improve the corrosion resistance and aesthetics of fasteners (e.g. screws, nuts, bolts, etc.). Here are some key points about zinc electroplating of fasteners:
Process Characteristics: Electro-galvanizing deposits a thin layer of zinc on the surface of the fastener through electrolysis. The process is relatively quick and can be done on-site, eliminating the need to send samples to a lab, saving time and costs.
Color and Variety: Electro-galvanized fasteners can be found in a variety of colors, including white zinc, blue zinc, colored zinc, black zinc, etc., which is primarily achieved through different passivation treatments. Color variety and better appearance is one of the reasons for its popularity.
Corrosion protection: Although galvanized zinc offers basic corrosion protection, its corrosion resistance is low compared to some other coatings such as hot-dip galvanizing. The neutral salt spray test for standard galvanized zinc plating is usually within 72 hours, although special sealer treatments can improve the corrosion resistance of some products to over 200 hours.
Hydrogen embrittlement: During the electro-galvanizing process, fasteners may absorb hydrogen atoms, leading to the phenomenon of hydrogen embrittlement, i.e., in high-stress environments, the build-up of hydrogen atoms may lead to cracks or even fracture within the metal. Therefore, for applications requiring high strength, hydrogen removal measures are required.
Cost and application: Due to its relatively low cost, ease of operation and good appearance, zinc plating has become the most common surface treatment for commercial fasteners, and is widely used in a variety of fields such as construction, automotive and home appliances.
Environmental considerations: With the improvement of environmental protection requirements, the chemicals used in the zinc plating process and their emissions need to meet the appropriate environmental standards to avoid pollution of the environment.
In summary, zinc plating of fasteners is a cost-effective and widely used surface treatment method, but the specific application environment needs to be taken into account when choosing the corrosion resistance requirements and the potential risk of hydrogen embrittlement.