Hot-dip galvanized angle steel is a corrosion-resistant material produced through a precise and effective process. The procedure begins with pickling the angle steel to remove rust and impurities, followed by thorough washing to eliminate any residual chemicals. Next, the steel is immersed in an auxiliary plating solvent, dried, and preheated to prepare for the zinc coating. It is then hung in a molten zinc bath at around 500°C, where the zinc adheres to the surface, forming a durable layer. After cooling, the steel undergoes passivation, cleaning, and grinding to finalize the hot-galvanizing process.
The resulting zinc coating has a uniform thickness of 30–50 micrometers, ensuring excellent reliability and long-term protection. Unlike other coatings, the zinc layer forms a metallurgical bond with the steel, making it an integral part of the surface. This strong adhesion enhances the durability and resistance to wear, making hot-dip galvanized angle steel ideal for use in harsh environments, such as those exposed to acid or alkaline mists.
In contrast, cold galvanizing involves applying a zinc-rich coating using methods like spraying or brushing. This coating contains up to 95% zinc and is typically used for repair work or in areas where access to a hot-dip line is not possible. The electrochemical principle of cold galvanizing requires proper surface preparation to ensure good contact between the zinc and the steel. Mechanical rust removal, such as sandblasting, is essential to achieve a surface cleanliness level of ISO 8501-1 Sa 2.5, which ensures a clean and rough surface for optimal adhesion.
Surface roughness also plays a crucial role in the effectiveness of cold galvanizing. For example, Zinga specifications require an average roughness (Ra) of 12.5, corresponding to a Rz of 55–75 micrometers. Other products like "Strong Zinc" and "Robaru" may have slightly lower requirements, with Rz ranging from 40–60 micrometers. When used as a base coat under heavy-duty coatings, the surface roughness should be greater than 60 micrometers to ensure proper adhesion of the entire system.
Whether for industrial applications or structural projects, both hot-dip and cold galvanizing provide effective corrosion protection, each suited to different conditions and requirements. Choosing the right method depends on factors like environment, budget, and application needs.
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