Hot-dip galvanizing, also known as hot-dip galvanizing, melts the zinc ingot at high temperatures, inserts some auxiliary material, and then dips the metal structure into a galvanizing bath to attach a zinc layer to the metal component. The advantage of hot-dip galvanizing is that he has strong anti-corrosion ability. The adhesion and hardness of galvanized layer are better "cold plating" or "plating". That is, the zinc salt solution is electrolyzed and plated on the plated part, generally without heating. , The amount of zinc is very small, it is easy to fall off in the wet environment. The next small series for everyone to introduce the difference between hot-dip galvanized and cold galvanized.
The difference between hot-dip galvanizing and cold galvanizing
1, the difference between the process
Hot dip galvanizing removes oil, pickling, dipping, drying and immersing in molten zinc for a certain period of time.
Cold galvanizing is also called electrogalvanizing. It is the use of electrolysis equipment to degrease the workpiece, pickle it into a solution of zinc salt, and connect the negative electrode of the electrolysis equipment; place the zinc plate on the opposite side of the workpiece and connect it to the electrolysis equipment. The positive electrode, which is connected to the power supply, uses a current that moves from the positive electrode to the negative electrode to deposit a layer of zinc on the workpiece.
2, the difference between appearance
The cold galvanized surface is smooth and bright, and the electroplating layer adopting the color passivation process is also a yellow-green color, showing a colorful color. The white passivation plating layer is greenish white or green white, and the white passivation plating layer is slightly colorful with the sunlight at a certain angle. In the corners of complex workpieces, it is easy to produce “electrical burn†and become dark, and the zinc layer is thick at this part. The corners of the cathode are prone to the formation of dead angles of current, resulting in a dark area of ​​undercurrent, where the zinc layer is thin. The whole work piece is free of zinc tumors and agglomerates.
The appearance of hot-dip galvanized steel is slightly rougher than that of cold galvanized steel, and it is silvery white. The appearance of the hot-dip galvanized steel sheet is prone to process water lines and a few drops of dripping, especially at one end of the workpiece. However, the hot-dip galvanized zinc layer is several tens of times thicker than the cold galvanized layer, and the anti-corrosion performance is several dozen times that of the cold galvanized.
3, the difference between galvanized products
(1) The inner and outer walls of the hot galvanized steel pipe are galvanized, while the cold galvanized steel pipe is galvanized only on the outer wall;
(2) The cold plating is uniform and the thickness is very thin; the hot plating is thick and the thickness is not uniform.
(3) The appearance of cold plating is bright, and the color of hot plating is dark.
(4) Since the cold plating layer is thin, the corrosion resistance is poor; the hot plating layer is dozens of times thicker than the cold galvanized layer, and forms an infiltration layer with the base metal, so that the corrosion resistance is good.
(5) The cold galvanized steel pipe looks brighter and smoother than the surface; the hot galvanized steel surface does not have the delicate brilliance of bright cold galvanized steel. The surface of the hot galvanized steel pipe looks as if it has some irregularities, and the surface is not shiny. Reflective.
Hot dip galvanizing application
Relative to electrogalvanizing, the zinc layer of hot-dip galvanizing is very thick, and it is a simple and effective steel protection process. It is suitable for the corrosion of steel products in strong corrosive environments such as strong acids and alkaline mists, etc. Rough surface, mainly anti-corrosion performance, poor decoration, is widely used in the protection of steel parts.
Currently, in addition to a large number of semi-finished galvanized products produced by continuous hot-dip galvanizing processes, such as galvanized steel plates, steel pipes and steel wires (these are semi-finished products because these galvanized steels still face further processing), Many finished iron and steel parts also use a lot of hot dip galvanizing technology for corrosion protection or protection. The hot dip galvanized products are widely used in transportation, construction, communications, power, energy, automobiles, petrochemicals, and home appliances.
Editor's summary: The difference between hot-dip galvanizing and cold-dip galvanizing is introduced here, and we hope to be helpful to everyone. If you want to know more related information, you can pay attention to this website information.
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