Hot-Dip Galvanized Steel Pipe
Hot-dip galvanized steel pipes undergo a meticulous process starting with pickling on the steel components. This initial step aims to eliminate surface iron oxide. Following pickling, a thorough cleaning occurs using an aqueous solution of ammonium chloride, zinc chloride, or a blend of both. The treated steel components are then immersed in a hot-dip electroplating tank. This method offers advantages such as a uniform coating, robust adhesion, and an extended service life.
Cold-Dip Galvanized Steel Pipe
Though less commonly utilized on a large scale today, cold-dip galvanized steel pipes are introduced for the sake of differentiation. Also known as electro-galvanizing, this process involves the removal of oil and pickling using electrolysis equipment. The steel components are then immersed in a zinc salt solution, with a zinc plate connected to the positive electrode of the electrolysis unit. By applying an electric current, zinc is deposited onto the pipe fittings. Cold-dip galvanized fittings undergo initial processing before galvanization.
Differences Between Hot-Dip and Cold-Dip Galvanized Steel Pipes:
- Manufacturing Process:
Hot-dip galvanizing forms an alloy layer through the reaction of molten metal with the iron matrix.
Cold-dip galvanizing achieves its anti-corrosion properties through electrochemical principles.
- Production Equipment:
Hot-dip galvanizing involves pickling equipment and annealing furnaces.
Cold galvanizing requires electrolysis equipment.
- Performance:
Hot-dip galvanizing offers durable anti-corrosion with a thick, standard-quality coating.
Cold galvanizing exhibits excellent environmental performance, with a thinner but smooth coating.
- Thickness of Galvanized Layer:
Hot-dip galvanized layers are relatively thick (over 10um), providing excellent durability.
Cold-dip galvanized layers are very thin (3-5um), offering good processing performance but limited corrosion resistance.
- Applications:
Hot-dip galvanized steel pipes find applications in various fields due to their robust anti-corrosion properties.
Cold-dip galvanized steel pipes are considered a promising direction for environmentally friendly, heavy-duty anti-corrosion coatings.
United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.
For more information about the product price, catalog and rolling mill inspection certificate,
please consult:Email:Sales@usisteels.com
