Technical requirements for hot-dip galvanized bolts

Bolts mainly play the role of coection and fastening, and their quality directly affects the coected parts. In order to prevent the surface wear and corrosion of the bolts, most people choose to surface treatment of the bolts, and hot-dip galvanizing is a commonly used method. Hot-dip galvanized bolts are also called hot-dip galvanized bolts. After removing the oil stains and rust on the surface of the bolts, they are immediately immersed in an aqueduct containing zinc liquid, and a zinc layer is formed on the surface of the bolts to prevent direct exposure, oxidation and wear of the bolts.

The surface treatment cost of hot-dip galvanized bolts is low, the corrosion resistance is good, and it can be kept free of rust for 15 years during use. The thickness of the zinc coating of hot-dip galvanized bolts is greater than 50 microns. The protective film of zinc oxide, zinc hydroxide and basic zinc carbonate formed on the surface of the zinc layer by atmospheric corrosion can slow down the atmospheric corrosion of the zinc layer.

Hot-dip galvanized bolts are not only plated with a thicker zinc layer, but also form a zinc-iron alloy layer. This plating method not only has the corrosion resistance of electro-galvanizing, but also has a strong incomparable with electro-galvanizing due to the zinc-iron alloy layer. Corrosion resistance, so this plating method is especially suitable for strong corrosive environments such as various strong acids and alkali mists.

principle
When the zinc is liquid, the hot zinc layer is formed through three steps, and the surface of the iron base is dissolved by the zinc solution to form a zinc-iron alloy phase layer. The Steel Masonry Concrete Screw Anchor Manufacturers  zinc ions in the alloy layer are further diffused onto the substrate to form a zinc-iron mutual soluble layer, and the surface of the alloy layer is surrounded by the zinc layer.

Features:

1. The surface of the bolt is covered with a thick layer of pure zinc, which can avoid the contact between the steel matrix and any corrosive solution and protect the bolt matrix from corrosion. Generally, a very thin and dense zinc oxide layer is formed on the surface of the zinc layer, which is insoluble in water and has a protective effect on the base of hot-dip galvanized bolts. more ideal.

2. It has a zinc-iron alloy alloy layer and has compactness, showing corrosion resistance in seawater salt spray environment and industrial environment. Due to the strong bond, zinc and iron are mutually soluble and have strong wear resistance.

3. Since zinc has good ductility and its alloy layer adheres firmly to the steel substrate, hot-dip galvanizing can be used in various forming processes such as cold punching, rolling, wire drawing and bending without damage coating.

4. After hot-dip galvanizing of steel structural parts, it is equivalent to one-time aealing treatment, which can effectively improve the mechanical properties of the steel matrix, eliminate the stress during forming and welding of the steel parts, and is conducive to the tuing of steel structural parts.

5. The surface of hot-dip galvanized bolts is bright and beautiful, and the pure zinc layer is a plastic galvanized layer in the process of hot-dip galvanizing. Its performance is basically close to that of pure zinc, and it has good ductility.