Hot-dip galvanizing is a galvanizing process that immerses the steel surface in molten zinc to cause a chemical reaction between the zinc and the steel surface to form a zinc-iron alloy layer. The advantages of hot-dip galvanizing are large coating thickness, good corrosion resistance, and high mechanical properties. It is suitable for manufacturing heavy-duty parts of precision castings and parts with high corrosion resistance requirements. It is widely used in construction, bridges, automobiles, ships, and other fields.
It should be noted that the selection of a suitable galvanizing process should be determined according to the specific requirements of the investment casting and the use environment. At the same time, to ensure the galvanizing effect, regular galvanizing manufacturers should be selected for galvanizing treatment, otherwise, the castings may rust and be scrapped during shipping.
Small knowledge point: In addition to electro-galvanizing and hot-dip galvanizing, there are two other galvanizing processes, mechanical galvanizing and spraying galvanizing.
So what are the advantages and disadvantages of the commonly used electro-galvanizing and hot-dip galvanizing processes for precision castings?
Advantages of hot-dip galvanizing:
1. Strong corrosion resistance: The zinc layer of hot-dip galvanizing is thicker than that of electro-galvanizing, usually between 45-100 microns, so its corrosion resistance is relatively strong, especially in humid and corrosive environments, it is not easy to rust.
2. Strong wear resistance: The zinc layer of hot-dip galvanizing is thicker than that of electro-galvanizing, so its wear resistance is relatively strong, and it is not easy to be scratched and worn.
3. Wide range of applications: hot-dip galvanizing is usually used for steel products in outdoor and severely corrosive environments, such as buildings, bridges, pipelines, etc.
Disadvantages of hot dip galvanizing:
1. High cost: The production cost of hot-dip galvanizing is relatively high because it requires heating and cooling.
2. Not suitable for complex shapes: The zinc layer of hot-dip galvanizing is not very uniform, so it is not suitable for complex-shaped object surfaces, such as screws and nuts.
3. Environmental protection issues: Waste gas and wastewater will be generated during the production process of hot-dip galvanizing, which has a great impact on the environment.
Commonly used hot-dip galvanized industries
1. Construction industry: The construction industry is one of the main application fields of hot-dip galvanizing. Hot-dip galvanizing can provide building materials with excellent corrosion resistance and beautiful appearance and is often used for surface treatment of building materials such as steel structures, steel pipes, steel plates, steel gratings, and steel beams.
2. Automobile manufacturing: Automobile manufacturing is also one of the important application fields of hot-dip galvanizing. Hot-dip galvanizing can provide auto parts with excellent corrosion resistance and a beautiful appearance and is often used for surface treatment of body parts, chassis, exhaust pipes, brake systems, and other parts.
3. Power industry: The power industry is also one of the important application fields of hot-dip galvanizing. Hot-dip galvanizing can provide electrical equipment with excellent corrosion resistance and a beautiful appearance and is often used for surface treatment of electrical equipment such as wires, cables, poles, transformers, and cable trays.
4. Agricultural machinery manufacturing: Agricultural machinery manufacturing is also one of the application fields of hot-dip galvanizing. Hot-dip galvanizing can provide agricultural machinery with excellent corrosion resistance and a beautiful appearance and is often used for surface treatment of agricultural machinery parts and accessories.
