Cold galvanizing (electrogalvanizing): zinc is gradually plated onto the metal surface through unidirectional current in the electroplating tank. The production speed is slow, the coating is uniform, and the thickness is thin, usually only 3-15 microns. The appearance is bright, smooth, and beautiful, but the corrosion resistance is poor and it will generally rust within a few months.

Hot-dip galvanizing, also known as hot-dip galvanizing, is a method of removing oil and rust from steel workpieces to present a clean, wet surface, and then immediately immersing them in a plating tank where zinc has been heated and melted in advance to form a layer of zinc coating on the surface of the workpiece. The hot-dip galvanized coating is thicker, generally 30-60 microns, and has a higher corrosion resistance.

Cold-dip galvanized wire: It is a metal composite material made of low-carbon steel as the core wire through wire drawing and electrogalvanizing process. It is mainly used in the manufacture of wire mesh, highway guardrails and construction projects.

Hot-dip galvanized wire: This product is made of high-quality carbon structural steel through drawing and hot-dip galvanizing. It is widely used in the manufacture of wire mesh, highway guardrails and construction projects. It has the characteristics of thick coating, strong corrosion resistance and firm coating.

1. Hot-Dip Galvanizing of Steel Wire
Hot-dip galvanizing of steel wire involves pickling steel and then immersing it in a molten zinc bath for galvanizing. At high temperatures, the steel surface reacts chemically with the zinc solution to form a zinc alloy coating, which provides corrosion protection. The process temperature of hot-dip galvanizing is usually around 450°C, so it can form a coating with a thicker thickness, higher density and better corrosion resistance.

2. Cold-Dip Galvanizing of Steel Wire
Cold-dip galvanizing of steel wire involves electrolytically depositing a zinc coating on the steel surface. The process temperature of cold galvanizing is below 100°C, thus preventing deformation and damage to the steel. However, the coating thickness of cold-dip galvanizing is thinner and its corrosion resistance is slightly inferior to that of hot-dip galvanizing.

1. Corrosion Resistance
Due to the thicker and denser coating of hot-dip galvanizing, it offers better corrosion resistance. Under the same environment, hot-dip galvanized coating has a longer service life.

2. Cost
Cold-dip galvanizing of steel wire is relatively inexpensive because the process is simpler than hot-dip galvanizing. However, since the coating of cold-dip galvanizing is thinner, hot-dip galvanizing is required in some special occasions to obtain better anti-corrosion effect.

3. Appearance
Hot-dip galvanizing produces a smoother and more uniform coating than cold-dip galvanizing, resulting in a more aesthetically pleasing finish. However, in some cases, cold-dip galvanizing may provide a better surface treatment.

Answers

• 
  We plan to import steel bars to Vietnam. Are there any restrictions on importing steel bars from your country at present? 26/11/2025 17:42:27
• 
  How to Remove Rust from Steel Pipes 21/11/2025 13:22:53
• 
  Why is there such a large price difference for stainless steel pipes? 20/11/2025 04:27:51
• 
  We plan to purchase a batch of hot-dip galvanized steel sheets. Given that our previous suppliers failed to meet our material performance requirements, we have strict standards for the corrosion resistance, galvanized layer quality, and processing performance of the sheets this time. Can you provide a detailed material certificate that meets the relevant standards to ensure that the chemical composition and mechanical properties are up to standard? Can you guarantee the bending performance? We need to confirm that when the sheet metal is processed at a specific bending radius, there will be no zinc layer peeling or micro-cracks. 18/11/2025 17:43:19
• 
  Why should an arch be reserved during the construction of corrugated culverts? 14/11/2025 11:38:05