The Role of Non-Zinc Metal Additions in the Galvanizing Process
Baifeng Steel operates two hot-dip galvanizing plants: Shengtai Galvanizing Plant and Lifeng Galvanizing Plant. These facilities specialize in producing a wide range of galvanized steel products, including galvanized angle steel, channel steel, flat steel, round steel, I-beams, and more. The galvanizing process plays a crucial role in enhancing the corrosion resistance and durability of these steel products, making them suitable for various industrial and construction applications.
One key aspect of the galvanizing process involves the use of non-zinc metal additions, which significantly influence the quality and performance of the final product. Here are some of the main functions of adding non-zinc metals during hot-dip galvanizing:
1. **Improving the Brightness of the Galvanized Layer**
During the hot-dip galvanizing process, the workpiece is immersed in molten zinc at high temperatures. As the zinc cools, it forms a Zn-Fe alloy layer on the surface of the steel. This layer often results in a dull, light gray appearance. To enhance the brightness and aesthetic appeal of the galvanized coating, small amounts of aluminum (typically between 0.03% and 0.05%) are added to the zinc bath. This addition helps form a more uniform and lustrous surface. Unlike low-temperature batch galvanizing, high-temperature hot-dip galvanizing typically requires a slightly higher concentration of aluminum to achieve the desired finish.
2. **Reducing Oxidation of Molten Zinc**
At elevated temperatures, the oxidation of molten zinc becomes more pronounced, which can lead to impurities and uneven coatings. Adding aluminum not only improves the surface appearance but also acts as a protective agent by reducing the rate of zinc oxidation. This helps maintain the purity and stability of the zinc bath, ensuring consistent and high-quality galvanizing results.
3. **Enhancing Adhesion of the Galvanized Layer**
In high-temperature galvanizing, the Zn-Fe alloy layer tends to be thicker compared to low-temperature processes. While this can improve corrosion resistance, it may also increase the brittleness of the coating and reduce its adhesion to the base steel. To counteract this, small amounts of lead are sometimes added to the zinc bath. Lead helps improve the adhesion strength of the galvanized layer, especially in high-temperature conditions where adhesion issues are more common.
By carefully controlling the composition of the zinc bath and incorporating non-zinc metals like aluminum and lead, Baifeng Steel ensures that its galvanized products meet high standards of quality, durability, and performance. This attention to detail allows the company to produce reliable and long-lasting steel products that meet the demands of modern industries.
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