Bridge erection is often used in our daily life. One of them is hot-dip galvanized bridge. It can be seen everywhere around us. It not only protects cables, but also ensures our daily power consumption. What are its characteristics?
The full surface layer of steel, whether its interior is concave, the inner corner of pipe fittings, or any other corner where the coating is not easy to touch, shall be protected, and the molten zinc can be evenly covered.
The hardness value of hot-dip galvanized layer is higher than that of steel, so its impact resistance and wear resistance are very excellent.
In the edge zone, the zinc layer is generally thicker than other parts, with excellent toughness and wear resistance. Compared with other coatings, at the edge, it is usually thin, difficult to construct, easy to damage and damage, so it often needs to be maintained again.
Even in case of major mechanical injury, other reasons shall be considered. Cause a small amount of zinc layer to fall off and expose the iron base. At this time, the surrounding zinc layer will play the role of sacrificing yang to protect the steel from corrosion. Contrary to other coatings, and vice versa, rust will form immediately and spread to the bottom of the coating in a short time, causing the coating to fall off.
The loss of zinc layer in atmospheric environment is very slow, about 1 / 17 to 1 / 18 of steel corrosion is deep, and it can be predicted. Its service life is longer than other coatings.
The service life of the coating mainly depends on the thickness of the coating in a specific environment. Moreover, the coating thickness is also affected by the steel thickness, that is, the thicker the steel is, it is easy to get a thicker coating. Therefore, in the same steel structure, the thicker steel parts must also get a thicker coating at the same time, so as to ensure a longer service life.
Due to beautiful and generous artistic creativity, or when used in a severely corrosive environment under special circumstances, the hot-dip galvanized layer can be treated with the upper coating. As long as the system selection of the upper coating is reasonable, the construction is easier, and its corrosion resistance is 1.5 ~ 2.5 times better than the combined service life of the upper coating and hot-dip galvanizing alone.
In addition to the hot-dip galvanizing method, there are many other methods to protect steel with zinc coating. Its advantages and disadvantages are generally widely used, with great corrosion resistance and high efficiency. It is suitable to choose the hot-dip galvanizing method.
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