Inspection points for surface defects of galvanized strip steel. Inspection points of surface defects of galvanized strip steel. We now see more hot-dip galvanized strip steel on the market. The surface of hot-dip galvanized strip will form defect surface due to improper operation. A strict process is required to produce better quality products.
If the hot-dip galvanizing defect is caused by malfunction or poor control of the equipment, such defects can be eliminated. In general, there are several common defects:
1. The zinc particles appearing on the surface of the hot-dip galvanizing, that is, the coarse particles that are not smoothed, the small particles not only affect the appearance but also affect the use. The reason for the formation of such particles is that the slag is excessively stirred by the machine during galvanizing production, adheres to the surface of the galvanized sheet, and because the production temperature is too high, the bottom slag floats and, in addition, the zinc liquid The aluminum content is too high, so that aluminum and zinc have a good affinity, and together, adhere to the surface of the galvanized sheet. Elimination of zinc particles can only be treated with the right medicine. For example, the bottom slag is often treated to maintain the galvanizing environment; the galvanizing bath temperature is not too high, and it is suitable to maintain 440 ° C ~ 450 ° C; aluminum content in zinc liquid Don't be too high, it should be kept at around 0.1%. Also note that inventory time will increase oxidation and so on. In short, zinc particles can be eliminated as long as they are strictly produced.
2. The hot-dip galvanized surface forms a thick edge, which means that the edge of the zinc layer is thicker than the middle portion, which becomes a thick-edge defect, which is not conducive to the coiling of the strip. The thick side is divided into a high-speed thick side and a low-speed thick side. The reason for forming the thick side is that the air is blown by the poor angle adjustment of the air knife in the galvanizing, which is caused by the spoiler. This defect.
3. If the gap of the air knife is clogged, an air knife mark will be formed, and a special cleaning tool is needed for cleaning.
4. The gray galvanized layer is caused by the inclusion of iron-zinc alloy therein;
In addition, there are some surface defects, such as air knife scratches, zinc protrusions, shell-like surfaces, strip patterns and other defects, which require manufacturers to strictly operate the process in the production process, strict process, produce better products, State Jinghua Metal Products Co., Ltd., high-quality galvanized steel strip, for your purchase, we sincerely serve you. Http://news.chinawj.com.cn
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