When a layer of zinc is applied to the surface of a steel plate, it becomes known as a galvanized plate. The purpose of this zinc coating is to enhance the product's resistance to corrosion. There are several methods for treating galvanized plates during the coating process, which result in different surface appearances, such as standard 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.
What are the four main approaches to handling hot-dip galvanized sheets?
Firstly, there’s passivation. This involves chemically treating the galvanized plate to reduce the risk of rust in humid environments, though it has limited anti-corrosion properties and can interfere with the adhesion of many coatings. This method isn't commonly used in zinc-ferroalloy coatings, except for surface treatments. Other types of galvanized plates typically have passivation layers.
Secondly, there’s oiling. This reduces the corrosive effects of hot-dip galvanized plates by decreasing the impact of humidity during storage. During the oiling process, the passivation treatment can also help reduce corrosion caused by humid conditions. Additionally, the oil layer can be removed using a degreaser without damaging the zinc layer.
Thirdly, there’s sealing paint. Applying a thin, transparent organic coating provides extra protection against corrosion, particularly improving resistance to fingerprints. This coating can also affect lubrication during forming and may be studied further by companies to evaluate its adhesive and undercoat properties.
Lastly, there’s phosphate treatment. The surface is coated with phosphoric acid-based products, requiring only basic cleaning and no additional steps. This treatment improves adhesion and corrosion resistance, reducing the risk of damage during storage and transport. Phosphating, combined with suitable lubricants, can also alter the forming characteristics of the material.
These methods provide various options for enhancing the durability and functionality of galvanized steel, making them suitable for a wide range of applications, from construction to automotive parts.
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