What is hot dip zinc cable tray
I. Overview of Hot Dip Zinc
Hot-dip galvanizing, also called hot-dip galvanizing, has been widely used in metal structures and facilities in various industries as an effective method of metal corrosion protection. Hot-dip galvanizing is to immerse the rust-removed steel component in a molten zinc solution at a high temperature of about 800 ° C to attach a zinc layer on the surface of the steel component. The thickness of the zinc layer must not be less than 65 μm for thin plates up to 5 mm and not less than 86 μm for thick plates. So as to achieve the purpose of anti-corrosion.
Second, the characteristics of hot-dip zinc
1. The entire steel surface is protected. No matter the inside of the pipe, or any other corner where the coating is difficult to enter, the molten zinc is easily and uniformly covered.
2. The hardness of galvanized layer is greater than that of steel. The uppermost Eta layer has a hardness of only 70 DPN, so it is vulnerable to collision and recessed, but the lower Zeta layer and the delta layer have 179 and 211 DPN hardness values, respectively, which are higher than those of the iron material's 159 DPN hardness. 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 at this corner are often the thinnest and least susceptible to construction and the most vulnerable, so they often require maintenance.
4. Even due to heavy mechanical injury or other reasons. Causes a small part of the zinc layer to fall off and expose the iron base. At this time, the surrounding zinc layer will function as a sacrificial anode to protect the steel here from corrosion. For other coatings, the opposite is true. Rust will form immediately and spread quickly 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. Coating life In a specific environment, it mainly depends on the thickness of the coating. The thickness of the coating is determined by the thickness of the steel, that is, the thicker the steel, the thicker the coating is, the thicker the steel part in the same steel structure must also get the thicker coating to ensure a longer life.
7. Due to aesthetics, art, or use in specific severely corrosive environments, the galvanized layer can be further coated with the duplex system. As long as the paint system is selected correctly and construction is easy, its corrosion protection effect is better than painting alone and hot dipping zinc. Life expectancy is 1.5 to 2.5 times better.
8. Use zinc layer to protect steel. In addition to hot-dip galvanizing, there are several other methods. The advantages and disadvantages are shown in Table 3. Generally, the most widely used, hot-dip zinc bridge has the best anti-corrosion effect and the most economic benefit. The best one is hot dip galvanizing.
Gold is zinc steel. All high-quality hot-dip zinc materials are used as the base material. Akzo-Nobel outdoor powder is used for the outer layer. The color is bright. Under natural circumstances, the fade rate of 15 years will not exceed 5%, and the rust rate of 20 years will not exceed 3%. (Except for human factors)
The first step of hot-dip zinc is pickling and rust removal, followed by cleaning. Incomplete two processes will leave hidden dangers to corrosion protection. So it must be dealt with thoroughly. For designers of steel structures, it is necessary to avoid designing components with matching surfaces, so as to avoid incomplete pickling or cleaning with acid solution in the gaps of the bonding surfaces. The phenomenon of yellow water flowing on the galvanized surface