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Surface quality inspection of hot-dip galvanized steel strip products
by：Hongmei
2021-03-15
Surface quality inspection of hot-dip galvanized steel strip products.
During the galvanizing process, some uncontrollable reasons will inevitably occur, such as power outages and machine failures, or improper operations by on-site operators, which may cause some shortcomings to the hot-dip galvanized steel strip products. Our company passed Years of accumulated experience are summarized as follows.
First: Zinc granules, rice-sized granular objects appear on the surface of some products. It is an iron-zinc compound called zinc granules, which is not only unsightly but also hinders use. The reason for the formation of zinc particles is that the zinc slag in the zinc bath is in the morning. The main way to avoid zinc particles is to clean the zinc slag in the bath on time.
Second: Thick edges, sometimes the zinc layer in the middle of the hot-dip galvanized steel strip is thinner than the zinc layer on the edges. Such products are called thick edges. Thick edges are more damaged than zinc particles and can cause waves. side. Thick edges are divided into high-speed thick edges and low-speed thick edges. The high-speed thick edge is the cause of the angle of the air knife, forming a counter-blowing turbulence, the solution is to adjust the angle of the air knife; the low-speed thick edge is because of the nozzle airflow loss, adjusting the nozzle spray speed is easy to solve.
During the galvanizing process, some uncontrollable reasons will inevitably occur, such as power outages and machine failures, or improper operations by on-site operators, which may cause some shortcomings to the hot-dip galvanized steel strip products. Our company passed Years of accumulated experience are summarized as follows.
First: Zinc granules, rice-sized granular objects appear on the surface of some products. It is an iron-zinc compound called zinc granules, which is not only unsightly but also hinders use. The reason for the formation of zinc particles is that the zinc slag in the zinc bath is in the morning. The main way to avoid zinc particles is to clean the zinc slag in the bath on time.
Second: Thick edges, sometimes the zinc layer in the middle of the hot-dip galvanized steel strip is thinner than the zinc layer on the edges. Such products are called thick edges. Thick edges are more damaged than zinc particles and can cause waves. side. Thick edges are divided into high-speed thick edges and low-speed thick edges. The high-speed thick edge is the cause of the angle of the air knife, forming a counter-blowing turbulence, the solution is to adjust the angle of the air knife; the low-speed thick edge is because of the nozzle airflow loss, adjusting the nozzle spray speed is easy to solve.
