Key Points for Inspecting Surface Defects in Galvanized Steel Strips. As the use of hot-dip galvanized steel strips becomes more widespread, it's essential to understand the common surface defects that may occur during the production process. These defects can arise due to improper operation or equipment malfunction, and they can affect both the appearance and functionality of the final product. To ensure high-quality output, a strict and well-controlled manufacturing process is crucial.
Several common surface defects are typically observed in hot-dip galvanized steel strips:
1. **Zinc Spots or Particles**: These appear as coarse or small particles on the surface, which not only affect aesthetics but also reduce the material’s usability. The formation of these particles is often caused by excessive stirring of the slag during the galvanizing process, leading to adhesion on the sheet surface. High temperatures can cause bottom slag to float, while an excess of aluminum in the zinc bath increases its affinity with zinc, resulting in particle accumulation. To address this issue, proper maintenance of the galvanizing environment is necessary. The temperature should be kept between 440°C and 450°C, and the aluminum content in the zinc bath should be maintained at around 0.1%. Additionally, prolonged storage can lead to oxidation, so careful handling is required throughout the process.
2. **Thick Edge Defects**: This occurs when the edges of the zinc coating become thicker than the center, making it difficult to coil the strip properly. Thick edges can be categorized into high-speed and low-speed types, depending on the air knife adjustment. Poor alignment of the air knife or issues with the air knife blade can lead to uneven zinc distribution, causing this defect.
3. **Air Knife Marks**: If the air knife nozzle becomes clogged, it can leave visible marks on the surface. Regular cleaning using specialized tools is essential to prevent this issue.
4. **Gray Coating**: A grayish appearance on the galvanized layer is often due to the inclusion of iron-zinc alloys within the coating, which affects the overall quality and performance of the steel.
Other common surface defects include air knife scratches, zinc nodules, shell-like surfaces, and strip patterns. All of these require precise control during the production process. Manufacturers must follow strict procedures and maintain consistent quality standards to minimize such issues.
At State Jinghua Metal Products Co., Ltd., we prioritize quality and reliability in our galvanized steel products. Whether you're looking for high-quality galvanized steel strips for industrial or commercial use, we are committed to delivering superior products and exceptional service. For more information, visit our website: [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
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