1. Features and disadvantages of electro-galvanized products
Let's talk about the advantages of electro-galvanized products first:
Compared with hot-dip galvanizing, electro-galvanizing has good uniformity, high control precision of coating thickness, and fine surface, which is very suitable for high coating quality requirements. And because the surface activity of the electro-galvanized zinc layer is high, there are many post-treatment methods, whether passivation, phosphating, fingerprint resistance, self-lubricating treatment, etc., there are various forms.
The control range of the thickness of the electro-galvanized coating covers a wide range from thin to thick, and the low can be plated from 3g/m2 to 90g/m2. Require. On the other hand, electrogalvanizing has advantages in saving zinc resources, because the coating is uniform and there is no zinc dross, so the utilization rate of zinc is high.
The processing performance and welding performance of electrogalvanizing are better, especially the welding performance.
Electrogalvanizing can be very convenient to produce single-sided plated products to meet some special requirements. For example, if the inner panel of an automobile has special welding requirements, single-sided electroplating is generally used.
Of course, electrogalvanized products also have some disadvantages. Its shortcomings are mainly related to its technological characteristics.
On the one hand, its raw materials should be annealed, continuous annealed or hood annealed, annealed, and re-plated after oiling. In this case, the quality of the substrate is required to be high, and insufficient performance may cause a series of surface quality problems;
On the other hand, due to the re-plating after annealing, the production process is longer than that of hot-dip plating, which has an impact on cost control. On the other hand, the electro-galvanized automobile sheet with thick zinc layer has a greater impact on the production capacity, the number of electroplating tanks must be increased, the equipment investment is large, and the power consumption is large, and the overall energy consumption and cost control are at a disadvantage.
