The manufacturing process of galvanized strips is mainly divided into two types: hot-dip galvanizing and electroplating galvanizing.
Manufacturing process of hot-dip galvanized strip
Hot dip galvanizing is a process of immersing a strip into molten zinc solution to form a layer of zinc on its surface. The specific process includes:
1. Material preparation: Select suitable stretching materials and perform pre-treatment such as cleaning and cutting to remove impurities such as oil stains and rust.
2. Acid washing and water washing: further remove surface impurities and roughen the surface of the pull rod, which is beneficial for the adhesion of the zinc layer.
3. Solvent treatment: Remove oxides and pollutants to ensure surface cleanliness.
4. Drying: Remove moisture to dry the surface of the pull strip.
5. Hot dip galvanizing: Dip the strip into zinc solution to form a zinc layer.
6. Internal and external blowing: Remove surface impurities and oxides, improve the purity and adhesion of the zinc layer.
7. Rolling and labeling: facilitates traceability of product quality and production process.
8. Passivation treatment: Form an oxide film on the surface of the zinc layer to further improve its corrosion resistance.
9. Inspection and packaging: Ensure product quality, facilitate transportation and storage.
Manufacturing Process of Galvanized (Cold Galvanized) Strip
Electrogalvanizing is the process of using the principle of electrolysis to form a layer of zinc deposition on the surface of the strip, which is relatively simple and cost-effective. The specific steps include:
1. Cleaning: Ensure that the surface of the pull strip is clean and free of oil stains.
2. Electroplating: A zinc layer is formed on the surface of the strip through electrolysis.
3. Passivation (optional): Improve the corrosion resistance of the zinc layer.
Scope of application
1. Hot dip galvanized strip:
Due to its excellent corrosion resistance, it is widely used in outdoor steel structure buildings, such as industrial plants, bridges, etc.
It is also commonly used in situations that require high strength and durability, such as steel bar connections and frame construction in the construction industry.
2. Galvanized strip:
Mainly used for indoor steel structure buildings with high appearance requirements.
Due to its low cost, it is also widely used in fields such as steel structure purlin support and steel structure greenhouses for aquaculture. However, it should be noted that its anti-corrosion performance is slightly inferior to hot-dip galvanizing and is not suitable for use in highly corrosive environments.
In summary, the manufacturing process and scope of application of galvanized strips depend on specific requirements and application environments. When choosing, it is necessary to comprehensively consider factors such as the material, size, quality of galvanized layer, and usage scenario of the pull strip.
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