304 square tube has been widely used in building curtain walls and steel structure projects for its good corrosion resistance and mechanical properties. However, in order to further improve its anti-corrosion and anti-rust ability and extend its service life, a variety of treatment processes are usually used.
Before anti-corrosion and anti-rust treatment, the surface of 304 square tube must be cleaned. This is because there may be impurities such as oil, dust, and oxide scale on the surface of the square tube, which will affect the effect of subsequent treatment processes. Common cleaning methods include mechanical grinding, pickling and degreasing. Mechanical grinding can remove the oxide scale and burrs on the surface, pickling can dissolve the rust and oxide layer on the surface, and degreasing is used to remove oil and ensure that the surface is clean and rough to enhance the adhesion of subsequent coatings or plating.
Passivation is a commonly used anti-corrosion and anti-rust method, especially for 304 square tube made of stainless steel. By immersing the square tube in a solution containing a passivator, a dense passivation film is formed on its surface. This passivation film can prevent oxygen and moisture from contacting the metal on the surface of the square tube, thereby playing a role in anti-corrosion and anti-rust. After the passivation treatment, the corrosion resistance of 304 square tube can be significantly improved, and the appearance and mechanical properties of the square tube will not be affected.
Hot-dip galvanizing is a treatment process in which the 304 square tube is immersed in molten zinc liquid to form a zinc layer on the surface of the square tube. The zinc layer has good corrosion resistance and can effectively protect the square tube from erosion by the external environment. The thickness of the hot-dip galvanized layer is generally between tens of microns and hundreds of microns, which can be selected according to the specific use environment and requirements. In building curtain walls and steel structure projects, the 304 square tube treated with hot-dip galvanizing can be used for a long time in harsh outdoor environments and has a long service life.
Painting is a common and cost-effective anti-corrosion and anti-rust method. Applying one or more layers of paint on the surface of the 304 square tube can form a physical barrier to prevent moisture, oxygen and other corrosive substances from contacting the square tube. Commonly used paints include acrylic paint, polyurethane paint, fluorocarbon paint, etc. Different types of paints have different performance characteristics. For example, fluorocarbon paint has excellent weather resistance and corrosion resistance, and is suitable for building curtain walls and steel structures exposed to the outdoors for a long time. Painting treatment can not only prevent corrosion and rust, but also choose different colors as needed to play a decorative role.
Powder spraying is a process in which dry powder coating is attached to the surface of 304 square tube by electrostatic adsorption and other methods, and then cured into a film by high-temperature baking. The coating formed by powder spraying has good wear resistance, corrosion resistance and decorative properties. Compared with painting treatment, the coating thickness of powder spraying is more uniform, and it is not easy to have defects such as sagging and blistering. At the same time, powder coating does not contain organic solvents, is environmentally friendly, and meets modern environmental protection requirements.
Nickel plating is a process of plating a layer of nickel metal on the surface of 304 square tube. Nickel has good corrosion resistance and glossiness, which can improve the appearance quality and anti-corrosion performance of square tubes. The nickel plating layer can be divided into single-layer nickel and multi-layer nickel. The multi-layer nickel structure can further improve the anti-corrosion effect. In some building curtain walls and steel structure projects with high requirements for appearance, the 304 square tube after nickel plating can increase the beauty of the building, and at the same time ensure that it will not be corroded during long-term use.
In order to obtain better anti-corrosion and anti-rust effects, a composite treatment process is sometimes used. For example, the 304 square tube is first hot-dip galvanized, and then the zinc layer is painted or powder-coated. This composite treatment process can give full play to the advantages of different treatment methods, form a multi-layer protective structure, and greatly improve the anti-corrosion and anti-rust ability of the square tube. In some special environments with extremely high anti-corrosion requirements, such as building curtain walls and steel structure projects in coastal areas or chemical environments, composite treatment processes have been widely used.
Through the application of the above multiple anti-corrosion and anti-rust treatment processes, the corrosion resistance and service life of 304 square tube in building curtain walls and steel structure projects can be effectively improved, ensuring the safety and stability of the building structure.
