Electro galvanized
Electro galvanizing is a commonly used galvanizing process, which can form a uniform, dense, and corrosion-resistant zinc layer on the surface of precision castings. The advantages of electro-galvanizing are uniform coating thickness, beautiful appearance, and good corrosion resistance. It is suitable for the surface protection of precision castings and is often used in the manufacture of furniture, electrical appliances, and auto parts.
Hot dip galvanized
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 electro-galvanizing:
1. Thin layer: The zinc layer of electro-galvanized is thinner than hot-dip galvanized, usually between 5-20 microns, so the surface of electro-galvanized is smooth and will not change the size and shape of steel.
2. Uniformity: The zinc layer of electro-galvanized is uniform and can be coated on the surface of objects with complex shapes, such as screws and nuts.
3. Low cost: The production cost of electro-galvanizing is relatively low because it does not require heating and cooling like hot-dip galvanizing.
4. Environmental protection: The production process of electro-galvanizing does not produce waste gas and wastewater, so it has less impact on the environment.
Disadvantages of electro-galvanized:
1. Poor corrosion resistance: The zinc layer of electro-galvanized is thinner than that of hot-dip galvanized, so its corrosion resistance is relatively poor, especially in humid and corrosive environments, it is easy to rust.
2. Poor wear resistance: The zinc layer of electro-galvanized is thinner than that of hot-dip galvanized, so its wear resistance is relatively poor, and it is easy to be scratched and worn.
3. The scope of application is limited: electro-galvanizing is usually used for steel products in indoor and mildly corrosive environments, such as furniture, electrical appliances, auto parts, etc.
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.
Commonly used electro-galvanized industries
1. Construction industry: electro-galvanized steel pipes, electro-galvanized steel sheets, electro-galvanized steel components, etc., used for building structures, pipes, roofs, walls, etc.
2. Automobile industry: electro-galvanized steel sheets, electro-galvanized bolts, electro-galvanized parts, etc., used for automobile body, engine, chassis, etc.
3. Home appliance industry: electro-galvanized steel sheets, electro-galvanized pipes, electro-galvanized parts, etc., are used to manufacture home appliances, such as refrigerators, washing machines, air conditioners, etc.
4. Electronics industry: electro-galvanized steel sheets, electro-galvanized parts, etc., used to manufacture electronic products, such as computers, mobile phones, flat-screen TVs, etc.
5. Agriculture: electro-galvanized iron wire, electro-galvanized mesh, electro-galvanized pipe, etc., used in agricultural construction, animal husbandry, gardening, etc.
In the seemingly simple surface treatment process, if there are shrinkage pores on the surface of the casting, the galvanized surface cannot meet the salt spray test level required by the customer. And when the castings are finished very well, and no reliable galvanized outsourcing supplier can be found, the corrosion resistance requirements of the customer for the galvanized surface cannot be met. When many inexperienced foundry factories first receive foreign trade orders, it often happens that the galvanized products are rusted and corroded during sea transportation before they are delivered to foreign customers.
XJL is committed to providing non-standard customized casting services. In the nearly 30 years of struggle in the precision casting industry, electro-galvanizing and hot-dip galvanizing are our common surface treatment processes. We not only have a reliable casting process but also have the support of a reliable galvanized outsourcing supplier. Therefore, we welcome all new and old customers to inquire about new projects of galvanized steel castings.
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