Reasons for Hot-Dip Galvanizing Steel Products

Steel is prone to rusting and even complete damage when exposed to air, water, or soil. Annually, corrosion accounts for approximately one-tenth of total steel production losses. Therefore, protective coatings, such as paints or galvanized layers, are necessary to safeguard steel from corrosion. Hot-dip galvanizing is one such method. Zinc is resistant to change in dry air, and in humid conditions, it forms a dense layer of basic zinc carbonate film on its surface, which protects the inner zinc from further corrosion. Additionally, if the galvanized layer is damaged for some reason, exposing a small area of the steel substrate, a micro-galvanic cell forms between the zinc and steel, protecting the steel as a cathode. The corrosion rate of zinc in the atmosphere is one-fifteenth of that of steel, indicating a longer lifespan for the zinc protective layer. Furthermore, compared to other corrosion-resistant metallic materials, zinc is relatively inexpensive. Therefore, hot-dip galvanizing steel is both durable and cost-effective.