When a layer of zinc is applied to the surface of a steel plate, it becomes known as a galvanized plate. The purpose of galvanization is to enhance the product's resistance to corrosion. During the galvanizing process, various treatments can result in different surface appearances, including regular zinc patterns, flat zinc patterns, fine zinc patterns, and zinc-free surfaces. These products are widely used and can even be found in small automotive components.
There are several methods to treat hot-dip galvanized sheets. One common approach is passivation, which involves applying a chemical treatment to reduce the risk of rust in humid environments. While this method helps with storage and transport, its corrosion-resistant properties are somewhat limited and may interfere with the adhesion of certain coatings. For this reason, passivation is typically not used in zinc-ferroalloy coatings, except as a surface treatment. Most other types of galvanized coatings do not rely on passivation layers.
Another treatment method is oiling. This process reduces the risk of corrosion by minimizing the effects of environmental humidity during storage. Oil can also be applied alongside passivation treatments to further protect hot-dip galvanized sheets and steel strips. Importantly, the oil layer can be removed using degreasing agents without damaging the zinc layer.
Sealing paint offers an additional layer of protection, particularly against fingerprints. By applying a thin, transparent organic coating, the product gains enhanced corrosion resistance. This method also allows for adjustments in lubricity during forming processes. Companies often study how these coatings adhere to the underlying material and their overall performance.
Lastly, phosphate treatment involves coating the surface with products containing phosphoric acid. This treatment improves adhesion and corrosion resistance, reducing the likelihood of damage during storage and transportation. Additionally, phosphating can alter the forming properties when combined with suitable lubricants. Together, these methods provide diverse options for enhancing the durability and functionality of galvanized materials.
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