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What is the difference between galvanized and hot-dip galvanized?

What is the difference between galvanized and hot-dip galvanized?

Dec 04, 2019

There are two plating methods for zinc corrugated nails, one is electroplating and the other is hot plating. What is the difference between them? Please see the breakdown below.

Electrogalvanization uses galvanic and negative ions to galvanize the electrode. The positive and negative electrodes of the zinc solution in the liquefaction are connected to the negative electrode of the corrugated nail. The anions move to the positive electrode under the action of current. The corrugated nail itself is a steel body. Zinc and steel form a microbattery during electroplating. The corrugated nail steel body is protected by the cathode to form a plating layer.

Hot-dip galvanizing is carried out in the state where zinc is also liquefied. Corrugated nails are placed in a liquefied zinc solution layer. At high temperatures, the iron and zinc on the surface of the corrugated nails dissolve each other to form an alloy layer. With this time, the surface zinc ions It slowly diffuses into iron and eventually covers the surface. After cooling, the zinc solution layer on the surface will become a zinc layer.

The hot-dip method is nominally an iron-zinc ion alloy layer, the zinc layer tightly covers the surface, and the surface iron-zinc mixed layer is very wear-resistant. The ductility is also good, and it can be processed by drawing or bending.

The formation layer of the electrogalvanized layer is relatively thick, and the coverage is uniform, indicating that it is smooth and smooth. The zinc layer is relatively pure, able to adapt to various environments, and has very good corrosion resistance. The degree of corrosion in a strong acid and alkali environment is not ideal. In the application of plastic and asbestos tiles, when using plastic products and asbestos tiles, galvanized corrugated nails are selected for fixing.

Galvanized corrugated nails are exported to humid and rainy regions such as the subtropical zone with their corrosion resistance. They have a broad market.