1. The entire surface of the steel is protected. The molten zinc can be easily and evenly covered regardless of the inside of the pipe fitting in the depression or any other corner where the coating is difficult to enter.
2. The hardness value of the galvanized layer is larger than that of the steel. The uppermost Eta layer has only 70 DPN hardness, so it is easy to be dented by collision, but the lower Zeta layer and delta layer have 179 and 211 DPN hardness values respectively, which are higher than the 159 DPN hardness value of iron materials, so its impact resistance and The abrasion resistance is quite good.
3. In the corner area, the zinc layer is often thicker than other places, and has good toughness and abrasion resistance. The other coatings are often the thinnest and most difficult to apply at this corner, and the most vulnerable, so they often need to be maintained.
4. Even if it suffers from great mechanical damage or other reasons. A small part of the zinc layer will fall off and the iron base will be exposed. At this time, the surrounding zinc layer will function as a sacrificial anode to protect the steel here from corrosion. The other coatings are just the opposite, rust will be generated immediately, and quickly spread under the coating, causing the coating to peel off.
5. The consumption of zinc layer in the atmosphere is very slow, about 1/17 to 1/18 of the corrosion rate of steel, and it is predictable. Its life is much longer than any other coating.
6. The life of the coating is mainly determined by the thickness of the coating under a certain environment. The thickness of the coating is determined by the thickness of the steel, that is, the thicker the steel, the thicker the coating is, so the thicker steel parts in the same steel structure must also get the thicker coating to ensure a longer life.
7. For aesthetics, art, or when used in a specific severely corrosive environment, the galvanized layer can be applied with the above paint treatment duplex system. As long as the paint system is selected correctly and the construction is easy, its anti-corrosion effect is better than separate painting and hot-dip galvanizing. The combined life span is 1.5~2.5 times better.
8. In addition to hot-dip galvanizing, there are several other methods to use zinc layer to protect steel. Generally, hot-dip galvanizing is the most widely used method, the best anti-corrosion effect and the best economic benefit.
